Linked List of Useful Libraries

Just an a collection libraries starred during some years of Android Development. Here is the definitely list of android Open Source libraries

List Menu(#list-menu)

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1. Personalized Views

Customed View. include ListView, ActionBar, Menu, ViewPager, Gallery, GridView, ImageView, ProgressBar, Dialog, Toast, EditText, TableView, Activity Animation and so on。

1. ListView

1. android-pulltorefresh
   Provide a reusable Pull to Refresh widget for Android, support ListView, ExpandableListView, GridView, WebView, ScrollView, HorizontalScrollView, ViewPager, support pulling Down from the top, and Pulling Up from the bottom and so on.
   Project Address: https://github.com/chrisbanes/Android-PullToRefresh
   Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/pull-to-refreshview-demo.apk?raw=true
   Similar App: Sina Weibo Pages

2. android-pulltorefresh-listview
   Pull to refresh listView for android, There is some bug for this
   Project Address: https://github.com/johannilsson/android-pulltorefresh
   Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/pull-to-refresh-listview-demo.apk?raw=true

3. android-Ultra-Pull-to-Refresh
   It's a replacement for the deprecated pull to refresh solution. It can contain any view you want. It's easy to use and more powerful than SwipeRefreshLayout. It's well designed, you can customize the UI effect you want as easy as adding a headview to ListView. Support API LEVEL >= 8 Project Address: https://github.com/liaohuqiu/android-Ultra-Pull-To-Refresh
   Demo Apk: https://github.com/liaohuqiu/android-Ultra-Pull-To-Refresh/blob/master/ptr-demo/target/ultra-ptr-demo.apk?raw=true

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1. DropDownListView
   Pull to refresh and load more when on bottom listView for android
   Project Address: https://github.com/Trinea/AndroidCommon
   Demo Apk: https://play.google.com/store/apps/details?id=cn.trinea.android.demo
   Document: http://www.trinea.cn/android/dropdown-to-refresh-and-bottom-load-more-listview/

2. DragSortListView
   Android ListView with drag and drop reordering.
   Project Address: https://github.com/bauerca/drag-sort-listview
   Demo Apk: https://play.google.com/store/apps/details?id=com.mobeta.android.demodslv
   Similar App: Wordpress Android

3. SwipeListView
   An Android List View implementation with support for drawable cells and many other swipe related features
   Project Address: https://github.com/47deg/android-swipelistview
   Demo Apk: https://play.google.com/store/apps/details?id=com.fortysevendeg.android.swipelistview
   Similar App: 微信

4. Android-SwipeToDismiss
   Android swipe to dismiss listView
   Project Address: https://github.com/romannurik/Android-SwipeToDismiss
   Demo Apk: https://github.com/JakeWharton/SwipeToDismissNOA/SwipeToDismissNOA.apk/qr_code

5. StickyListHeaders
   An android library for section headers of listView that stick to the top
   Project Address: https://github.com/emilsjolander/StickyListHeaders
   Similar App: Contacts app of Android 4.0 Ice Cream Sandwich
   Renderings:

6. pinned-section-listview
   Easy to use ListView with pinned sections for Android. Pinned section is a header view which sticks to the top of the list until at least one item of that section is visible.
   Project Address: https://github.com/beworker/pinned-section-listview
   Renderings:

7. PinnedHeaderListView
   A ListView with pinned section headers for Android
   Project Address: https://github.com/JimiSmith/PinnedHeaderListView

8. QuickReturnHeader
   A ListView/ScrollView header that hides when scrolling down and reappears immediately when scrolling up, regardless of how far down the list we've gone.
   Project Address: https://github.com/ManuelPeinado/QuickReturnHeader
   Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/quick-return-header-demo.apk?raw=true
   Similar App: google plus

9. IndexableListView
   iPhone like fast scroll ListView on Android with non-alphabetic overlays
   Project Address: https://github.com/woozzu/IndexableListView
   Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/indexable-listview.apk?raw=true
   Similar App: Weichat contact

10. CustomFastScrollView
    A FastScrollView with non-alphabetic overlays
    Project Address: https://github.com/nolanlawson/CustomFastScrollViewDemo
    Renderings:

11. Android-ScrollBarPanel
    Android-ScrollBarPanel allows to attach a View to a scroll indicator like it's done in Path 2.0
    Project Address: https://github.com/rno/Android-ScrollBarPanel
    Renderings:

12. SlideExpandableListView
    A better ExpandableListView, with animated expandable views for each list item
    Project Address: https://github.com/tjerkw/Android-SlideExpandableListView
    Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/slide-expandable-listView-demo.apk?raw=true

13. JazzyListView
    JazzyListView is an extension of ListView designed to animate list item views as they become visible. There are a number of pre-built, bundled effects that can be used by setting the effect in code or an XML layout attribute, like grow, cards, curl, wave, flip, fly. Also, it is possible to use a custom effect by implementing a JazzyEffect.
    Project Address: https://github.com/twotoasters/JazzyListView
    Demo Apk: https://play.google.com/store/apps/details?id=com.twotoasters.jazzylistview.sample

14. ListViewAnimations
    An Android library which allows developers to easily add animations to ListView items
    Project Address: https://github.com/nhaarman/ListViewAnimations
    Demo Apk: https://play.google.com/store/apps/details?id=com.haarman.listviewanimations
    Similar App: Google plus, Google Now, Ultimate, Light Flow Lite, TreinVerkeer, Running Coach, Pearl Jam Lyrics, Calorie Chart, Car Hire, Super BART, DK FlashCards, Counter Plus, Voorlees Verhaaltjes 2.0

15. DevsmartLib-Android
    A Horizontal ListView for Android
    Project Address: https://github.com/dinocore1/DevsmartLib-Android
    Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/horizontal-listview-demo.apk?raw=true

16. HorizontalVariableListView
    Horizontal list view for Android which allows variable items widths
    Project Address: https://github.com/sephiroth74/HorizontalVariableListView

17. LinearListView
    Android library that allows you to bind a LinearLayout with a ListAdapter.
    Project Address: https://github.com/frankiesardo/LinearListView

18. MultiChoiceAdapter
    A ListView adapter with support for multiple choice modal selection
    Project Address: https://github.com/ManuelPeinado/MultiChoiceAdapter
    Demo Apk: https://play.google.com/store/apps/details?id=com.manuelpeinado.multichoiceadapter.demo

19. EnhancedListView
    An Android ListView with enhanced functionality (e.g. Swipe To Dismiss and Undo)
    Project Address: https://github.com/timroes/EnhancedListView
    Demo Apk: https://play.google.com/store/apps/details?id=de.timroes.android.listviewdemo&rdid=de.timroes.android.listviewdemo

20. ListBuddies
    Android library of a pair of auto-scroll circular parallax ListViews like the ones on the expedia app home page.
    Project Address: https://github.com/jpardogo/ListBuddies
    Demo Apk: https://play.google.com/store/apps/details?id=com.jpardogo.android.listbuddies
    Renderings:
    a>

2. ActionBar

1. ActionBarSherlock
   Action bar implementation which uses the native action bar on Android 4.0+ and a custom implementation on pre-4.0 through a single API and theme.
   Project Address: https://github.com/JakeWharton/ActionBarSherlock
   Demo Apk: https://play.google.com/store/apps/details?id=com.actionbarsherlock.sample.demos

2. ActionBar-PullToRefresh
   ActionBar-PullToRefresh provides an easy way to add a modern version of the pull-to-refresh interaction to your application.
   Project Address: https://github.com/chrisbanes/ActionBar-PullToRefresh
   Demo Apk: https://play.google.com/store/apps/details?id=uk.co.senab.actionbarpulltorefresh.samples.stock
   Similar App: Gmail，Google plus

3. FadingActionBar
   Android library implementing a fading effect for the action bar, similar to the one found in the Play Music app
   Project Address: https://github.com/ManuelPeinado/FadingActionBar
   Demo Apk: https://play.google.com/store/apps/details?id=com.manuelpeinado.fadingactionbar.demo
   Similar App: google music

4. NotBoringActionBar
   Auto dismis actionbar when content scroll down
   Project Address: https://github.com/flavienlaurent/NotBoringActionBar
   Demo Apk: http://flavienlaurent.com/blog/2013/11/20/making-your-action-bar-not-boring/
   Similar App: google music

5. RefreshActionItem
   An action bar item which acts both as a refresh button and as a progress indicator
   Project Address: https://github.com/ManuelPeinado/RefreshActionItem
   Demo Apk: https://play.google.com/store/apps/details?id=com.manuelpeinado.refreshactionitem.demo
   Similar App: The New York Times，DevAppsDirect.

6. GlassActionBar
   An Android library which implements a glass-like effect for the action bar
   Project Address: https://github.com/ManuelPeinado/GlassActionBar
   Demo Apk: https://play.google.com/store/apps/details?id=com.manuelpeinado.glassactionbardemo
   Similar App: google music
   a>

3. Menu

1. MenuDrawer
   A slide-out menu implementation, which allows users to navigate between views in your app. Most commonly the menu is revealed by either dragging the edge of the screen, or clicking the 'up' button in the action bar. It support content below or up to menu when compare to SlidingMenu.
   Project Address: https://github.com/SimonVT/android-menudrawer
   Demo Apk: http://simonvt.github.io/android-menudrawer/
   Similar App: Gmail, Google Music

2. SlidingMenu
   An Android library that allows you to easily create applications with slide-in menus. It support animation when compare to MenuDrawer.
   Project Address: https://github.com/jfeinstein10/SlidingMenu
   Demo Apk: https://play.google.com/store/apps/details?id=com.slidingmenu.example
   Similar App: Foursquare, LinkedIn, Zappos, Rdio, Evernote Food, Plume, VLC for Android, ESPN ScoreCenter, MLS MatchDay, 9GAG, Wunderlist 2, The Verge, MTG Familiar, Mantano Reader, Falcon Pro (BETA), MW3 Barracks

3. ArcMenu
   An android custom view which looks like the menu in Path 2.0 for iOS.
   Project Address: https://github.com/daCapricorn/ArcMenu
   Similar App: Path
   Renderings:

4. android-satellite-menu
   Android Satellite Menu
   Project Address: https://github.com/siyamed/android-satellite-menu
   Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/satellite-menu-demo.apk?raw=true
   Similar App: Path

5. radial-menu-widget
   A radial (pie) menu for Android
   Project Address: https://code.google.com/p/radial-menu-widget/
   Renderings: http://farm8.staticflickr.com/7377/11621125154_d1773c2dcc_o.jpg

6. Android Wheel Menu
   Circular menu widget for Android.
   Project Address: https://github.com/anupcowkur/Android-Wheel-Menu
   Renderings:

7. FoldingNavigationDrawer
   Folding navigation drawer for android.
   Project Address: https://github.com/tibi1712/FoldingNavigationDrawer-Android
   Demo Apk: https://play.google.com/store/apps/details?id=com.ptr.folding.sample
   Renderings:

8. AndroidResideMenu
   The idea of ResideMenu is from Dribbble 1 and 2 likes iOS ResideMenu
   Project Address: https://github.com/SpecialCyCi/AndroidResideMenu
   Renderings:
   a>

4. ViewPager Gallery

1. Android-ViewPagerIndicator
   Paging indicator widgets compatible with the ViewPager from the Android Support Library and ActionBarSherlock. Originally based on Patrik Åkerfeldt's ViewFlow.
   Project Address: https://github.com/JakeWharton/Android-ViewPagerIndicator
   Demo Apk: https://play.google.com/store/apps/details?id=com.viewpagerindicator.sample

2. JazzyViewPager
   An easy to use ViewPager that adds an awesome set of custom swiping animations. Just change your ViewPagers to JazzyViewPagers and you'return good to go!
   Project Address: https://github.com/jfeinstein10/JazzyViewPager
   Demo Apk: https://github.com/jfeinstein10/JazzyViewPager/blob/master/JazzyViewPager.apk?raw=true

3. Android-DirectionalViewPager
   ViewPager class that supports paging both vertically and horizontally as well as changing between the two at runtime.
   Project Address: https://github.com/JakeWharton/Android-DirectionalViewPager
   Demo Apk: https://market.android.com/details?id=com.directionalviewpager.sample

4. android-pulltorefresh
   Provide a reusable Pull to Refresh widget for Android, support ListView, ExpandableListView, GridView, WebView, ScrollView, HorizontalScrollView, ViewPager, support pulling Down from the top, and Pulling Up from the bottom and so on.
   Project Address: https://github.com/chrisbanes/Android-PullToRefresh
   Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/pull-to-refreshview-demo.apk?raw=true

5. FancyCoverFlow
   FancyCoverFlow is a flexible Android widget providing out of the box view transformations to give your app a unique look and feel.
   Project Address: https://github.com/davidschreiber/FancyCoverFlow
   Demo Apk: https://play.google.com/store/apps/details?id=at.technikum.mti.fancycoverflow.samples
   Renderings:

6. AndroidTouchGallery
   Android widget for gallery, using viewpager. Allow pinch zoom and drag for images by url. Widget allows use it in Android > 2.0
   Project Address: https://github.com/Dreddik/AndroidTouchGallery
   Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/touch-gallery-demo.apk?raw=true

7. Android Auto Scroll ViewPager
   Android Auto scroll ViewPager or ViewPager in ViewPager
   Project Address: https://github.com/Trinea/android-auto-scroll-view-pager
   Demo Apk: https://play.google.com/store/apps/details?id=cn.trinea.android.demo
   Document: http://www.trinea.cn/android/auto-scroll-view-pager/

8. Salvage view
   Generic view recycler and ViewPager PagerAdapter implementation.
   Project Address: https://github.com/JakeWharton/salvage

9. Android PagerSlidingTabStrip
   An interactive indicator to navigate between the different pages of a ViewPager
   Project Address: https://github.com/astuetz/PagerSlidingTabStrip
   Demo Apk: https://play.google.com/store/apps/details?id=com.astuetz.viewpager.extensions.sample
   a>

5. GridView

1. StaggeredGridView
   A modified version of Android's experimental StaggeredGridView. Includes own OnItemClickListener and OnItemLongClickListener, selector, and fixed position restore. contains cache, extends from ViewGroup
   Project Address: https://github.com/maurycyw/StaggeredGridView
   Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/staggered-gridview-demo.apk?raw=true
   Similar App: Pinterest

2. AndroidStaggeredGrid
   An Android staggered grid view which supports multiple columns with rows of varying sizes. extends from AbsListView
   Project Address: https://github.com/etsy/AndroidStaggeredGrid
   Similar App: Pinterest

3. PinterestLikeAdapterView
   An Android multi column list view like Pinterest. allow pull to refresh.
   Project Address: https://github.com/GDG-Korea/PinterestLikeAdapterView
   Similar App: Pinterest

4. DraggableGridView
   A drag-and-drop scrolling grid view for Android, extends from ViewGroup. It can swich from up to bottom, If you want switch from left screen to right please use PagedDragDropGrid below
   Project Address: https://github.com/thquinn/DraggableGridView
   Demo Apk: https://github.com/thquinn/DraggableGridView/blob/master/bin/DraggableGridViewSample.apk?raw=true

5. StickyGridHeaders
   StickyGridHeaders is an Android library that provides a GridView that shows items in sections with headers. By default the section headers stick to the top like the People app in Android 4.x but this can be turned off.
   Project Address: https://github.com/TonicArtos/StickyGridHeaders
   Renderings:

6. PagedDragDropGrid
   An Android ViewGroup that implements a paged grid with drag'n'drop moveable items. It can swich from left screen to right, If you want switch from up to bottom please use DraggableGridView above
   Project Address: https://github.com/mrKlar/PagedDragDropGrid
   Demo视频：http://youtu.be/FYTSRfthSuQ

7. Android-DraggableGridViewPager
   Zaker style grid view pager, support dragging & rearrange, using as zaker's main screen. Project Address: https://github.com/zzhouj/Android-DraggableGridViewPager
   Demo Apk: https://github.com/Trinea/trinea-download/blob/master/draggable-grid-viewpager-demo.apk?raw=true

8. GridView with Header and Footer
   Same with ListView. It allows you call addHeaderView(), addFooterView to add views to GridView.
   Project Address：https://github.com/liaohuqiu/android-GridViewWithHeaderAndFooter
   Renderings：
   a>

6. ImageView

1. PhotoView
   Implementation of ImageView for Android that supports zooming, by various touch gestures, like multi-touch and double-tap. Works perfectly when using used in a scrolling parent (such as ViewPager). Allows the application to be notified when the displayed Matrix has changed. Useful for when you need to update your UI based on the current zoom/scroll position.
   Project Address: https://github.com/chrisbanes/PhotoView
   Demo Apk: https://play.google.com/store/apps/details?id=uk.co.senab.photoview.sample
   Similar App: photup

2. android-gif-drawable
   Views and Drawable for displaying animated GIFs on Android. Bundled GIFLib via JNI is used to render frames. This way should be more efficient than WebView or Movie classes. Animation starts automatically and run only if View with attached GifDrawable is visible.
   Project Address: https://github.com/koral--/android-gif-drawable

3. ImageViewEx
   Extension of Android's ImageView that supports animated GIFs and includes a better density management.
   Project Address: https://github.com/frapontillo/ImageViewEx
   Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/imageviewex-demo.apk?raw=true

4. RoundedImageView
   A fast ImageView that supports rounded corners and ovals or circles
   Project Address: https://github.com/vinc3m1/RoundedImageView
   Renderings:

5. SelectableRoundedImageView
   ImageView that supports different radiuses on each corner. It also supports oval(and circle) shape and border.
   Project Address: https://github.com/pungrue26/SelectableRoundedImageView
   Demo Apk: https://play.google.com/store/apps/details?id=com.joooonho
   Renderings:

6. ColorArt
   iTunes 11-style color matching code for Android, is a library that uses an image to create a themed image/text display
   Project Address: https://github.com/MichaelEvans/ColorArt
   Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/color-art-demo.apk?raw=true

7. CircleImageView
   A circular ImageView for Android
   Project Address: https://github.com/hdodenhof/CircleImageView
   Renderings:

8. ImageViewZoom
   Android ImageView widget with zoom and pan capabilities
   Project Address: https://github.com/sephiroth74/ImageViewZoom
   Similar App: https://play.google.com/store/apps/details?id=com.aviary.android.feather

9. KenBurnsView
   Android library that provides an extension to ImageView that creates an immersive experience by animating its drawable using the Ken Burns Effect.
   Project Address: https://github.com/flavioarfaria/KenBurnsView

10. CustomShapeImageView
    Custom shape ImageView using PorterDuffXfermode with paint shapes and SVGs.
    Project Address: https://github.com/MostafaGazar/CustomShapeImageView
    Renderings:
    a>

7. ProgressBar

1. SmoothProgressBar
   A small Android library allowing you to have a smooth and customizable horizontal indeterminate ProgressBar
   Project Address: https://github.com/castorflex/SmoothProgressBar
   Demo Apk: https://play.google.com/store/apps/details?id=fr.castorflex.android.smoothprogressbar.sample

2. ProgressWheel
   A progress wheel for android, intended for use instead of the standard progress bar.
   Project Address: https://github.com/Todd-Davies/ProgressWheel
   Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/progress-wheel-demo.apk?raw=true

3. android-square-progressbar
   A progressbar which go's around an image.
   Project Address: https://github.com/mrwonderman/android-square-progressbar
   Demo Apk: https://play.google.com/store/apps/details?id=net.yscs.android.square_progressbar_example
   Similar App: square
   Renderings:

4. HoloCircularProgressBar
   HoloCircularProgressBar is a Custom View implementation for Android you might know from the Android Clock App from Android 4.1
   Project Address: https://github.com/passsy/android-HoloCircularProgressBar
   Similar App: Android4.1 Clock App
   Renderings:

5. ProgressButton
   A custom progress indicator with a tiny footprint.
   Project Address: https://github.com/f2prateek/progressbutton
   Document: http://f2prateek.com/progressbutton/
   Renderings:

6. GoogleProgressBar
   Android library to display different kind of google related animations for the progressBar.
   Project Address: https://github.com/jpardogo/GoogleProgressBar
   Renderings:

7. TH-ProgressButton
   Circular progress View button inspired by FFCircularProgressView
   Project Address: https://github.com/torryharris/TH-ProgressButton
   Renderings:
   a>

8. TextView

include TextView and other views extend TextView, like EditText, Button, RadioButton and so on

1. android-flowtextview
   A TextView for Android which supports text wrapping around other views
   Project Address: https://code.google.com/p/android-flowtextview/
   Renderings: http://i949.photobucket.com/albums/ad332/vostroman1500/1.png

2. Android Form EditText
   Android form edit text is an extension of EditText that brings data validation facilities to the edittext.
   Project Address: https://github.com/vekexasia/android-edittext-validator
   Demo Apk: https://play.google.com/store/apps/details?id=com.andreabaccega.edittextformexample

3. Emojicon
   A library to show emoji in TextView, EditText (like WhatsApp) for Android
   Project Address: https://github.com/rockerhieu/emojicon
   Document: http://rockerhieu.com/emojicon/

4. android-circlebutton
   Circle button widget for Android, extend from ImageView actually
   Project Address: https://github.com/markushi/android-circlebutton
   Demo Apk: https://github.com/markushi/android-circlebutton/blob/master/example/example.apk

5. Segmented Radio Buttons for Android
   Android implementation of iPhone's segmented control
   Project Address: https://github.com/vinc3m1/android-segmentedradiobutton
   Demo Apk: https://github.com/thquinn/DraggableGridView/blob/master/bin/DraggableGridViewSample.apk?raw=true
   Renderings:

6. Chips EditText Library
   Chips EditText, Token EditText, Bubble EditText, Spannable EditText and etc.. There are many names of this control. Implement by SpannableStringBuilder actually
   Project Address: https://github.com/kpbird/chips-edittext-library
   Demo Apk: https://github.com/kpbird/chips-edittext-library/tree/master/ChipsEditTextDemo/bin

7. AutoFitTextView
   A TextView that automatically resizes text to fit perfectly within its bounds.
   Project Address: https://github.com/grantland/android-autofittextview

8. Shimmer for Android
   An Android TextView with a shimmering effect
   Project Address: https://github.com/RomainPiel/Shimmer-android

9. Titanic
   Android experiment showing a sinking TextView
   Project Address: https://github.com/RomainPiel/Titanic
   Renderings:
   a>

9. Others

1. achartengine
   AChartEngine is a charting library for Android applications. It currently supports the following chart types: line chart, area chart, scatter chart, time chart, bar chart, pie chart, bubble chart, doughnut chart, range (high-low) bar chart, dial chart / gauge, combined (any combination of line, cubic line, scatter, bar, range bar, bubble) chart, cubic line chart and so on.
   Project Address: https://code.google.com/p/achartengine/
   Official Website: http://www.achartengine.org/
   Renderings:
   http://www.achartengine.org/dimages/sales_line_and_area_chart.png
   http://www.achartengine.org/dimages/temperature_range_chart.png
   http://www.achartengine.org/dimages/combined_chart.png
   http://www.achartengine.org/dimages/budget_chart.png
   Similar App: Wordpress Android，Google Analytics

2. GraphView
   Android Graph Library for creating zoomable and scrollable line and bar graphs.
   Project Address: https://github.com/jjoe64/GraphView
   Demo Project: https://github.com/jjoe64/GraphView-Demos
   Demo Apk: https://play.google.com/store/apps/details?id=com.sothree.umano
   Similar App: Wordpress Android，Google Analytics

3. android-flip
   A component for flip animation on Android, which is similar to the effect in Flipboard iPhone/Android
   Project Address: https://github.com/openaphid/android-flip
   Demo Apk: https://github.com/openaphid/android-flip/blob/master/FlipView/Demo/APK/Aphid-FlipView-Demo.apk?raw=true
   Similar App: flipboard

4. FlipImageView
   Small android lib allowing you to make a flip imageview easily, by extending FlipImageView.
   Project Address: https://github.com/castorflex/FlipImageView
   Demo Apk: https://play.google.com/store/apps/details?id=fr.castorflex.android.flipimageview

5. SwipeBackLayout
   An Android library that help you to build app with swipe back gesture.
   Project Address: https://github.com/Issacw0ng/SwipeBackLayout
   Demo Apk: https://play.google.com/store/apps/details?id=me.imid.swipebacklayout.demo
   Similar App: Zhihu

6. Cards-UI
   A library that allows you to easily mimic Google Play's card layout on Android.
   Project Address: https://github.com/afollestad/Cards-UI
   Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/cards-ui-demo.apk?raw=true

7. cardslib
   Card Library provides an easy way to display a UI Card in your Android app. You can display single cards, list of cards and grid or staggered grid of Cards.
   Project Address: https://github.com/gabrielemariotti/cardslib
   Demo Apk: https://play.google.com/store/apps/details?id=it.gmariotti.cardslib.demo

8. android-styled-dialogs
   A simple library for styling Android dialogs in the Holo theme. It also removes boilerplate code for displaying simple dialogs.
   Project Address: https://github.com/inmite/android-styled-dialogs
   Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/styled-dialogs-demo.apk?raw=true

9. Crouton
   Context sensitive notifications for Android, like toast. include style like alert, comfirm, info and click to dismiss, allow to set time of diaplay and customed view
   Project Address: https://github.com/keyboardsurfer/Crouton
   Demo Apk: http://play.google.com/store/apps/details?id=de.keyboardsurfer.app.demo.crouton

10. supertooltips
    SuperToolTips is an Open Source Android library that allows developers to easily create Tool Tips for views.
    Project Address: https://github.com/nhaarman/supertooltips
    Demo Apk: https://play.google.com/store/apps/details?id=com.haarman.supertooltips

11. Android ViewBadger
    A simple way to "badge" any given Android view at runtime without having to cater for it in layout
    Project Address: https://github.com/jgilfelt/android-viewbadger
    Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/android-viewbadger.apk?raw=true
    Renderings: https://github-camo.global.ssl.fastly.net/a705a3e88c75ae2394943bd7c56f725697616ea8/687474703a2f2f7777772e6a65666667696c66656c742e636f6d2f766965776261646765722f76622d31612e706e67

12. Android Sliding Up Panel
    This library provides a simple way to add a draggable sliding up panel (popularized by Google Music, Google Maps and Rdio) to your Android application. Umano Team <3 Open Source.
    Project Address: https://github.com/umano/AndroidSlidingUpPanel
    Demo Apk: https://play.google.com/store/apps/details?id=com.sothree.umano
    Similar App: Google Music

13. android-times-square
    Standalone Android widget for picking a single date from a calendar view.
    Project Address: https://github.com/square/android-times-square
    Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/times-square-demo.apk?raw=true

14. android-calendar-card
    Android calendar view (like card)
    Project Address: https://github.com/kenumir/android-calendar-card
    Demo Apk: https://play.google.com/store/apps/details?id=com.wt.calendarcardsample
    Renderings:

15. ColorPickerView
    A simple yet beautiful color picker component for Android.
    Project Address: https://code.google.com/p/color-picker-view/
    Renderings:

16. HoloColorPicker
    An Android Holo themed colorpicker
    Project Address: https://github.com/LarsWerkman/HoloColorPicker
    Demo Apk: https://docs.google.com/file/d/0BwclyDTlLrdXRzVnTGJvTlRfU2s/edit

17. AndroidWheel
    Custom wheel widget for android
    Project Address: https://github.com/sephiroth74/AndroidWheel
    Renderings:

18. TableFixHeaders
    Android library that implements a table with fixed headers.
    Project Address: https://github.com/InQBarna/TableFixHeaders
    Demo Apk: http://bit.ly/13buAIq

19. UITableView
    Library and example project on how to use the UITableView component
    Project Address: https://github.com/thiagolocatelli/android-uitableview
    Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/ui-tableview-demo.apk?raw=true

20. ATableView
    Create iOS-like tables (UITableView) for Android, using UIKit object model
    Project Address: https://github.com/dmacosta/ATableView
    Demo Apk: https://play.google.com/store/apps/details?id=com.nakardo.atableview.demo

21. UndoBar
    The UI component for Android advanced UI pattern undo-bar, used in Gmail app
    Project Address: https://github.com/soarcn/UndoBar
    Renderings:

22. Inscription
    Inscription is an open source library to display information about your Android app, like info of change or new feature
    Project Address: https://github.com/MartinvanZ/Inscription

23. ActivityTransition
    An android project presenting some transitions you can use between activities, like fade, flip, fly into and so on
    Project Address: https://github.com/ophilbert/ActivityTransition
    Demo Apk： https://github.com/jfeinstein10/JazzyViewPager/blob/master/JazzyViewPager.apk?raw=true

24. GlowPadBackport
    A backport of the Android 4.2 GlowPadView that works on the SDK on API levels 4+
    Project Address: https://github.com/rock3r/GlowPadBackport
    Demo Apk: https://play.google.com/store/apps/details?id=net.sebastianopoggi.samples.ui.GlowPadSample
    Renderings:

25. GlowPadView
    GlowPadView for Android is a great library to implement Google's lockscreen and new alarmclock style.
    Project Address: https://github.com/nadavfima/GlowPadView
    Renderings: https://raw.github.com/nadavfima/GlowPadView/master/example.png

26. android-lockpattern
    Lockpattern activity for Android
    Project Address: https://code.google.com/p/android-lockpattern/
    Demo Apk: https://play.google.com/store/apps/details?id=group.pals.android.lib.ui.lockpattern.demo
    Document: https://code.google.com/p/android-lockpattern/wiki/QuickUse

27. PatternLock
    Yet another pattern lock library for Android
    Project Address：https://github.com/DreaminginCodeZH/PatternLock
    Demo Apk：https://github.com/DreaminginCodeZH/PatternLock/raw/master/dist/sample.apk
    Renderings：

28. RangeBar
    Android widget for selecting a range of values. It provides for the selection of a range of values rather than a single value.
    Project Address: https://github.com/edmodo/range-bar
    Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/range-bar-demo.apk?raw=true
    Renderings:

29. SuperToasts
    The SuperToasts library enhances and builds upon the Android Toast class. Some of the features of this library include context sensitive toasts (SuperActivityToasts), toasts with buttons and icons, non context sensitive toasts (SuperToasts), and a new style of toasts (SuperCardToasts) with many customization options for each.
    Project Address: https://github.com/JohnPersano/SuperToasts
    Demo Apk: https://play.google.com/store/apps/details?id=com.supertoastsdemo
    Renderings:

30. GoogleDateTimePickers
    New Google Date and time pickers
    Project Address: https://github.com/Mirkoddd/GoogleDateTimePickers
    Document: https://play.google.com/store/apps/details?id=com.mirko.sample&hl=it

31. UndoBar
    An implementation of Android's Undo Bar as seen in Google's Gmail app.
    Project Address: https://github.com/jenzz/Android-UndoBar
    Renderings:

32. ColorPickerPreference
    ColorPickerPreference for android to create color picker in preferences.
    Project Address: https://github.com/attenzione/android-ColorPickerPreference
    Renderings:

33. HoloGraphLibrary
    This is a library written to allow beautiful graphs and charts to be easily incorporated into your Android application.
    Project Address: https://bitbucket.org/danielnadeau/holographlibrary/src
    Document: https://bitbucket.org/danielnadeau/holographlibrary/wiki/Home

34. ChromeView
    Android WebView implementation that uses the latest Chromium code
    Project Address: https://github.com/pwnall/chromeview

35. Discrollview
    DiscrollView support Item fading in or out, translate or scale
    Project Address: https://github.com/flavienlaurent/discrollview
    Demo Apk: https://github.com/flavienlaurent/discrollview/raw/master/sample.apk

36. Android Slider Preference Library
    Android library that allows applications to add dialog-based slider widgets to their settings
    Project Address: https://github.com/jayschwa/AndroidSliderPreference

37. ShowcaseView library
    Highlight the best bits of your app to users quickly
    Project Address: https://github.com/amlcurran/ShowcaseView

38. android-segmented-control
    ios7 UISegmentedControl for android
    Project Address: https://github.com/hoang8f/android-segmented-control

39. PullScrollView
    Pull and background rebound effect
    Project Address: https://github.com/MarkMjw/PullScrollView
    Renderings:
    a>

2. Common Util Libs

Include Dependency Injection, ImageCache, Network, Database ORM, Android common lib, Compatible low version, Multimedia, Event Bus, Sensor, Security, Plug-in, File, Othersa>

1. Dependency Injection

Speeds up Android development by dependency injection

1. AndroidAnnotations(Code Diet)
   AndroidAnnotations is an Open Source framework that speeds up Android development. It takes care of the plumbing, and lets you concentrate on what's really important.
   Project Address: https://github.com/excilys/androidannotations
   Document: https://github.com/excilys/androidannotations/wiki
   Official Website: http://androidannotations.org/

2. roboguice
   RoboGuice 2 takes the guesswork out of development. Inject your View, Resource, System Service, or any other object, and let RoboGuice 2 take care of the details.
   Project Address: https://github.com/roboguice/roboguice
   Document: https://github.com/roboguice/roboguice/wiki

3. butterknife
   View "injection" library for Android.
   Project Address: https://github.com/JakeWharton/butterknife
   Document: http://jakewharton.github.io/butterknife/

4. Dagger
   A fast dependency injector for Android and Java.
   Project Address: https://github.com/square/dagger
   Document: http://square.github.io/dagger/
   a>

2. Image Cache

1. Android-Universal-Image-Loader
   Powerful and flexible library for loading, caching and displaying images on Android.
   Project Address: https://github.com/nostra13/Android-Universal-Image-Loader
   Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/universal-imageloader-demo.apk?raw=true
   Document: http://www.intexsoft.com/blog/item/74-universal-image-loader-part-3.html

2. picasso
   A powerful image downloading and caching library for Android
   Project Address: https://github.com/square/picasso
   Document: http://square.github.io/picasso/

3. ImageCache
   Image Cache, support multi caching algorithms
   Project Address: https://github.com/Trinea/AndroidCommon
   Demo Apk: https://play.google.com/store/apps/details?id=cn.trinea.android.demo
   Document: http://www.trinea.cn/android/android-imagecache/

4. Cube ImageLoader
   Easy to use, high performance, used in some of the Apps in Alibaba Group. Project Address：https://github.com/etao-open-source/cube-sdk
   Demo Apk：https://github.com/liaohuqiu/cube-sdk/raw/master/cube-sdk-sample.apk
   Document：http://cube-sdk.liaohuqiu.net/
   Renderings: a>

3. Network

1. Retrofit
   Type-safe REST client for Android and Java by Square
   Project Address: https://github.com/square/retrofit
   Document: http://square.github.io/retrofit/

2. okhttp
   An HTTP+SPDY client for Android and Java applications.
   Project Address: https://github.com/square/okhttp
   Document: http://square.github.io/okhttp/

3. Asynchronous Http Client for Android
   An asynchronous, callback-based Http client for Android built on top of Apache's HttpClient libraries.
   Project Address: https://github.com/loopj/android-async-http
   Document: http://loopj.com/android-async-http/

4. android-query
   Android-Query (AQuery) is a light-weight library for doing asynchronous tasks and manipulating UI elements in Android.
   Project Address: https://code.google.com/p/android-query/
   Document: https://code.google.com/p/android-query/#Why_AQuery?
   Demo Apk: https://play.google.com/store/apps/details?id=com.androidquery

5. Async Http Client
   Asynchronous Http and WebSocket Client library for Java
   Project Address: https://github.com/AsyncHttpClient/async-http-client
   Document: http://sonatype.github.io/async-http-client/

6. Ion
   Android Asynchronous Networking and Image Loading
   Project Address: https://github.com/koush/ion
   Document: https://github.com/koush/ion#more-examples

7. Http Request
   A simple convenience library for using a HttpURLConnection to make requests and access the response.
   Project Address: https://github.com/kevinsawicki/http-request
   Document: https://github.com/kevinsawicki/http-request#examples

8. RoboSpice
   RoboSpice is a modular android library that makes writing asynchronous network requests easy
   Project Address: https://github.com/stephanenicolas/robospice
   Demo Apk: https://github.com/stephanenicolas/RoboDemo/downloads
   a>

4. Database

1. greenDAO
   GreenDAO is a light & fast ORM solution for Android that maps objects to SQLite databases. Being highly optimized for Android, greenDAO offers great performance and consumes minimal memory.
   Project Address: https://github.com/greenrobot/greenDAO
   Document: http://greendao-orm.com/documentation/
   Official Website: http://greendao-orm.com/

2. ActiveAndroid
   Active record style SQLite persistence for Android
   Project Address: https://github.com/pardom/ActiveAndroid
   Document: https://github.com/pardom/ActiveAndroid/wiki/_pages

3. Sprinkles
   Sprinkles is a boiler-plate-reduction-library for dealing with databases in android applications
   Project Address: https://github.com/emilsjolander/sprinkles
   Document: http://emilsjolander.github.io/blog/2013/12/18/android-with-sprinkles/

4. ormlite-android
   ORMLite Android functionality used in conjunction with ormlite-core
   Project Address: https://github.com/j256/ormlite-android
   Document: http://ormlite.com/sqlite_java_android_orm.shtml
   a>

5. Android common lib

1. Guava
   The Guava project contains several of Google's core libraries that we rely on in our Java-based projects: collections, caching, primitives support, concurrency libraries, common annotations, string processing, I/O, and so forth.
   Project Address: https://code.google.com/p/guava-libraries/
   Document: https://code.google.com/p/guava-libraries/wiki/GuavaExplained

2. Volley
   Easy, Fast Networking for Android
   Project Address: https://android.googlesource.com/platform/frameworks/volley
   Github Address: https://github.com/mcxiaoke/android-volley
   Document: http://commondatastorage.googleapis.com/io-2013/presentations/110%20-%20Volley-%20Easy,%20Fast%20Networking%20for%20Android.pdf

3. AndroidCommon
   Android common lib, include ImageCache, HttpCache, DropDownListView, DownloadManager, Utils and so on
   Project Address: https://github.com/Trinea/AndroidCommon
   Demo Apk: https://play.google.com/store/apps/details?id=cn.trinea.android.demo
   Document: http://www.trinea.cn/android/android-common-lib/

4. shipfaster
   Sample project demonstrating usage of Dagger + Otto + Robolectric + Retrofit + Picasso + OkHttp
   Project Address: https://github.com/pyricau/shipfaster

5. CleanAndroidCode
   This project is a proof of concept to show how to integrate Dagger, Otto and AndroidAnnotations.
   Project Address: https://github.com/pyricau/CleanAndroidCode
   a>

6. Android Compatible low version

1. ActionBarSherlock
   Action bar implementation which uses the native action bar on Android 4.0+ and a custom implementation on pre-4.0 through a single API and theme.
   Project Address: https://github.com/JakeWharton/ActionBarSherlock
   Demo Apk: https://play.google.com/store/apps/details?id=com.actionbarsherlock.sample.demos

2. Nine Old Androids
   Android library for using the Honeycomb animation API on all versions of the platform back to 1.0!
   Project Address: https://github.com/JakeWharton/NineOldAndroids
   Demo Apk: https://play.google.com/store/apps/details?id=com.jakewharton.nineoldandroids.sample
   Document: http://nineoldandroids.com/

3. HoloEverywhere
   Bringing Holo Theme from Android 4.1 to 2.1 and above.
   Project Address: https://github.com/Prototik/HoloEverywhere
   Demo Apk: https://raw.github.com/Prototik/HoloEverywhere/repo/org/holoeverywhere/demo/2.1.0/demo-2.1.0.apk
   Document: http://android-developers.blogspot.com/2012/01/holo-everywhere.html

4. SherlockNavigationDrawer
   Modification of the Android NavigationDrawer sample to use ActionbarSherlock so that we can use the NavigationDrawer on older devices
   Project Address: https://github.com/tobykurien/SherlockNavigationDrawer

5. Notifications4EveryWhere
   Bringing Notifications from Android 4.1 to 2.2 and above.
   Project Address: https://github.com/youxiachai/Notifications4EveryWhere
   NavigationDrawerDocument: http://developer.android.com/training/implementing-navigation/nav-drawer.html

6. Android Switch Widget Backport
   A backport of the Switch widget that was introduced on Android 4.X to Android2.1++
   Project Address: https://github.com/BoD/android-switch-backport
   Demo Apk: https://play.google.com/store/apps/details?id=org.jraf.android.backport.switchwidget.sample
   Document: https://github.com/BoD/android-switch-backport#using-the-switch

7. android-datepicker
   Android 4.0 DatePicker backported to 2.2
   Project Address: https://github.com/SimonVT/android-datepicker
   a>

7. Multimedia

1. cocos2d-x
   cocos2d-x is a multi-platform framework for building 2d games, interactive books, demos and other graphical applications. It is based on cocos2d-iphone, but instead of using Objective-C, it uses C++. It works on iOS, Android, Windows Phone, OS X, Windows and Linux.
   Project Address: https://github.com/cocos2d/cocos2d-x
   Document: http://www.cocos2d-x.org/wiki
   Official Website: http://www.cocos2d-x.org/

2. Vitamio
   Vitamio is an open multimedia framework for Android and iOS, with full and real hardware accelerated decoder and renderer.
   Project Address: https://github.com/yixia/VitamioBundle
   Document: http://www.vitamio.org/docs/

3. PhotoProcessing
   A demo of how you can process photos leveraging the ndk, support Instafix, Ansel, Testino, XPro, Retro, BW, Sepia, Cyano, Georgia, Sahara, HDR, Rotate, Flip and so on
   Project Address: https://github.com/lightbox/PhotoProcessing
   Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/photo-processing.apk?raw=true

4. Android StackBlur
   Android StackBlur is a library that can perform a blurry effect on a Bitmap based on a gradient or radius, and return the result.
   Project Address: https://github.com/kikoso/android-stackblur
   Demo Apk: https://github.com/kikoso/android-stackblur/blob/master/StackBlurDemo/bin/StackBlurDemo.apk?raw=true
   Document: https://github.com/kikoso/android-stackblur#usage

5. Bitmap Smart Clipping using OpenCV
   Bitmap Smart Clipping using OpenCV
   Project Address: https://github.com/beartung/tclip-android

6. Cropper
   Android widget for cropping and rotating an image.
   Project Address: https://github.com/edmodo/cropper
   Document: https://github.com/edmodo/cropper/wiki
   Renderings:

7. android-crop
   Android library project for cropping images
   Project Address: https://github.com/jdamcd/android-crop
   Renderings:

8. TileView
   The TileView widget is a subclass of ViewGroup that provides a mechanism to asynchronously display tile-based images, with additional functionality for 2D dragging, flinging, pinch or double-tap to zoom, adding overlaying Views (markers), built-in Hot Spot support, dynamic path drawing, multiple levels of detail, and support for any relative positioning or coordinate system.
   Project Address: https://github.com/moagrius/TileView
   Demo Apk: http://moagrius.github.io/TileView/TileViewDemo.apk

9. BlurEffectForAndroidDesign
   Sample to show how to implement blur graphical tricks
   Project Address: https://github.com/PomepuyN/BlurEffectForAndroidDesign

10. android-eye
    Change your android phone to surveillance camera
    Project Address: https://github.com/Teaonly/android-eye
    Demo Apk: https://play.google.com/store/apps/details?id=teaonly.droideye

11. libpng for Android
    libpng for Android NDK
    Project Address: https://github.com/julienr/libpng-android
    Document: http://www.libpng.org/pub/png/libpng.html
    a>

8. Event Bus

A typical use case for Android apps is gluing Activities, Fragments, and background threads together. Conventional wiring of those elements often introduces complex and error-prone dependencies and life cycle issues.

1. EventBus
   Android optimized event bus that simplifies communication between Activities, Fragments, Threads, Services, etc. Less code, better quality.
   Project Address: https://github.com/greenrobot/EventBus
   Document: https://github.com/greenrobot/EventBus#general-usage-and-api

2. Otto
   An enhanced Guava-based event bus with emphasis on Android support.
   Project Address: https://github.com/square/otto
   Document: http://square.github.io/otto/
   Demo Apk: https://play.google.com/store/apps/details?id=de.greenrobot.eventperf
   a>

9. Sensor

1. Great Android Sensing Toolkit
   GAST is a toolkit for using Android's Sensing capabilities. It contains the examples, boiler plate code, and algorithms you need to properly use Android sensors.
   Project Address: https://github.com/gast-lib/gast-lib
   Demo Apk: https://play.google.com/store/apps/details?id=root.gast.playground
   Document: https://github.com/gast-lib/gast-lib#documentation

2. SensorManager
   Android Sensor Manager Library
   Project Address: https://github.com/nlathia/SensorManager
   Document: https://docs.google.com/document/d/1TqThJULb-4e6TGb1gdkAaPCfyuXStjJpbnt7a0OZ9OE/edit

3. GPSLogger
   GPSLogger is an Android app that logs GPS information to GPX, KML or text files and has options for annotating and sharing.
   Project Address: https://github.com/mendhak/gpslogger
   Demo Apk: https://play.google.com/store/apps/details?id=com.mendhak.gpslogger
   Document: http://code.mendhak.com/gpslogger/

4. Pedometer
   Lightweight pedometer app for Android using the hardware step sensor
   Project Address: https://github.com/j4velin/Pedometer

5. leapcast
   ChromeCast emulation app for any device
   Project Address: https://github.com/dz0ny/leapcast

6. Arduino-Communicator
   Very simple Android application for communicating with Arduino
   Project Address: https://github.com/jeppsson/Arduino-Communicator

7. android-pedometer
   App for Android phones that counts your steps.
   Project Address: https://github.com/bagilevi/android-pedometer
   Demo Apk: http://pedometer.googlecode.com/files/Pedometer-1.4.apk

8. OwnTracks for Android
   OwnTracks Android App
   Project Address: https://github.com/owntracks/android

9. Shake Detector library for Android
   This library provides a easy way to detect a shake movement using the build-in accelerometer and fire a callback on the UI thread every times it happens.
   Project Address: https://github.com/tbouron/ShakeDetector
   Demo Apk: https://play.google.com/store/apps/details?id=com.github.tbouron.shakedetector.example

10. Android heart rate monitor
    Android heart rate monitor
    Project Address: https://github.com/phishman3579/android-heart-rate-monitor

11. Bluetooth LE Library for Android
    This library allows for easy access to a Bluetooth LE device's AdRecord and RSSI value. It offers additional functionality for iBeacons.
    Project Address: https://github.com/alt236/Bluetooth-LE-Library---Android
    Demo Apk: https://play.google.com/store/apps/details?id=uk.co.alt236.btlescan
    a>

10. Security

1. SQLCipher
   SQLCipher is an SQLite extension that provides 256 bit AES encryption of database files.
   Project Address: https://github.com/sqlcipher/sqlcipher
   Document: http://sqlcipher.net/sqlcipher-for-android/

2. Conceal
   Conceal provides easy Android APIs for performing fast encryption and authentication of data, such as that stored on SD cards
   Project Address: https://github.com/facebook/conceal
   Document: https://github.com/facebook/conceal#usage

3. Android-PasscodeLock
   Android Library that provides passcode lock to your app
   Project Address: https://github.com/wordpress-mobile/Android-PasscodeLock
   Demo Apk: https://play.google.com/store/apps/details?id=com.sothree.umano
   Similar App: Wordpress Android, Alipay

4. GlowPadBackport
   A backport of the Android 4.2 GlowPadView that works on the SDK on API levels 4+
   Project Address: https://github.com/rock3r/GlowPadBackport
   Demo Apk: https://play.google.com/store/apps/details?id=net.sebastianopoggi.samples.ui.GlowPadSample
   Renderings:

5. GlowPadView
   GlowPadView for Android is a great library to implement Google's lockscreen and new alarmclock style. (Taken from Android's Source Code)
   Project Address: https://github.com/nadavfima/GlowPadView
   Renderings: https://raw.github.com/nadavfima/GlowPadView/master/example.png

6. android-lockpattern
   lockpattern activity for Android
   Project Address: https://code.google.com/p/android-lockpattern/
   Demo Apk: https://play.google.com/store/apps/details?id=group.pals.android.lib.ui.lockpattern.demo
   Document: https://code.google.com/p/android-lockpattern/wiki/QuickUse
   a>

11. Others

1. Salvage view
   Generic view recycler and ViewPager PagerAdapter implementation.
   Project Address: https://github.com/JakeWharton/salvage

2. Android Priority Job Queue
   A Job Queue specifically written for Android to easily schedule jobs (tasks) that run in the background, improving UX and application stability.
   Project Address: https://github.com/path/android-priority-jobqueue
   Document: https://github.com/path/android-priority-jobqueue#getting-started

3. jsoup
   Java HTML Parser, with best of DOM, CSS, and jquery
   Project Address: https://github.com/jhy/jsoup
   Official Website: http://jsoup.org/

4. ZIP
   ZeroTurnaround ZIP Library
   Project Address: https://github.com/zeroturnaround/zt-zip
   Document: https://github.com/zeroturnaround/zt-zip#examples

5. Cobub Razor
   Cobub Razor - Open Source Mobile Analytics Solution, include web, android，ios, window phone
   Project Address: https://github.com/cobub/razor
   Demo Apk: http://demo.cobub.com/razor
   Document: http://dev.cobub.com/

6. aFileChooser
   Android library that provides a file explorer to let users select files on external storage.
   Project Address: https://github.com/iPaulPro/aFileChooser

7. androidpn
   An open source project to provide push notification support for Android -- a xmpp based notification server and a client tool kit.
   Project Address: https://github.com/dannytiehui/androidpn

8. purePDF
   A complete actionscript PDF library
   Project Address: https://github.com/sephiroth74/purePDF

9. Bolts
   Bolts is a collection of low-level libraries designed to make developing mobile apps easier.
   Project Address: https://github.com/BoltsFramework/Bolts-Android/

10. CastCompanionLibrary-android
    CastCompanionLibrary-android is a library project to enable developers integrate Cast capabilities into their applications faster and easier.
    Project Address: https://github.com/googlecast/CastCompanionLibrary-android
    Document: https://developers.google.com/cast/

11. CastVideos-android
    CastVideos-android application shows how to cast videos from an android device in a way that is fully compliant with the Design Checklist.
    Project Address: https://github.com/googlecast/CastVideos-android
    Document: https://developers.google.com/cast/

12. Uninstall_Statics
    Android Statistical application is uninstalled
    Project Address: https://github.com/sevenler/Uninstall_Statics
    Document: http://www.cnblogs.com/zealotrouge/p/3157126.html

13. xCombine
    Android Plugin Framework
    Project Address: https://github.com/wyouflf/xCombine
    Document: http://my.oschina.net/u/1171837/blog/155377

14. Memento
    Memento is an annotation processor for Android that gives your activities a memory. It introduces the @Retain annotation, which allows you to retain arbitrary fields of an activity across configuration changes in a simple and type-safe manner.
    Project Address: https://github.com/mttkay/memento
    Document: https://github.com/mttkay/memento#usage

15. svg-android
    SVG parsing and rendering for Android
    Project Address: https://code.google.com/p/svg-android/

16. Office 365 SDK for Android Preview
    Office 365 SDK for Android Preview by Microsoft Open Technologies, Inc. support Microsoft SharePoint Lists, Microsoft SharePoint Files, Microsoft Exchange Calendar, Microsoft Exchange Contacts, Microsoft Exchange Mail
    Project Address: https://github.com/OfficeDev/Office-365-SDK-for-Android

17. OpenSpritz-Android
    OpenSpritz concept for Android, is a Spritz-like .epub and website reader for Android 3.0+
    Project Address: https://github.com/OnlyInAmerica/OpenSpritz-Android

18. FreeFlow
    A layout engine for Android that decouples layouts from the View containers that manage scrolling and view recycling. FreeFlow makes it really easy to create custom layouts and beautiful transition animations as data and layouts change
    Project Address: https://github.com/Comcast/FreeFlow
    Demo Apk: https://github.com/Comcast/FreeFlow/releases

19. Android Gesture Detectors Framework
    Gesture detector framework for multitouch handling on Android
    Project Address: https://github.com/Almeros/android-gesture-detectors
    a>

3. Excellent projects

Linux
Project Address: https://github.com/torvalds/linux
Android
Project Address: https://android.googlesource.com/

(1) ZXing
ZXing ("zebra crossing") is an open-source, multi-format 1D/2D barcode image processing library implemented in Java, with ports to other languages.
Project Address: https://github.com/zxing/zxing
Demo Apk: https://play.google.com/store/apps/details?id=com.google.zxing.client.android

(2) photup
With photup you can share your photos to your Facebook profile, quicker than ever before.
Project Address: https://github.com/chrisbanes/photup
Demo Apk: https://play.google.com/store/apps/details?id=uk.co.senab.photup

(3) github-android GitHub Android App
Project Address: https://github.com/github/android
Demo Apk: https://play.google.com/store/apps/details?id=com.github.mobile

(4) Notes
MIUI Notes Project Address: https://github.com/MiCode/Notes
Demo Apk: https://github.com/Trinea/TrineaDownload/blob/master/miui-note-demo.apk?raw=true

(5) weicuiyuan
Sina Weibo Android Client
Project Address: https://github.com/qii/weiciyuan
Demo Apk: https://play.google.com/store/apps/details?id=org.qii.weiciyuan

(6) gnucash-android
Gnucash for Android mobile companion application.
Project Address: https://github.com/codinguser/gnucash-android
Demo Apk: http://play.google.com/store/apps/details?id=org.gnucash.android

(7) AntennaPod
A podcast manager for Android
Project Address: https://github.com/danieloeh/AntennaPod
Demo Apk: https://play.google.com/store/apps/details?id=de.danoeh.antennapod

(8) ChaseWhisplyProject
An augmented reality attempt
Project Address: https://github.com/tvbarthel/ChaseWhisplyProject
Demo Apk: https://play.google.com/store/apps/details?id=fr.tvbarthel.games.chasewhisply

(9) Tweet Lanes
Tweet Lanes for Android
Project Address: https://github.com/chrislacy/TweetLanes
Demo Apk: https://play.google.com/store/apps/details?id=com.tweetlanes.android

(10) Financius
Android Expense Manager
Project Address: https://github.com/mvarnagiris/Financius
Demo Apk: https://play.google.com/store/apps/details?id=com.code44.finance

(11) todo.txt-android
Official Todo.txt Android app for managing your todo.txt file stored in Dropbox.
Project Address: https://github.com/ginatrapani/todo.txt-android
Demo Apk: https://play.google.com/store/apps/details?id=com.todotxt.todotxttouch

(13) Muzei Live Wallpaper
Muzei Live Wallpaper for Android
Project Address: https://github.com/romannurik/muzei
Demo Apk: https://play.google.com/store/apps/details?id=net.nurik.roman.muzei
a>

4: Development and testing tools

Android open source projects about development tools and testing tools. a>

1. Development productivity tools

1. Json2Java
   Automate processing Java classes to mirror json models.
   Project Address: https://github.com/jonfhancock/JsonToJava
   Online Demo: http://jsontojava.appspot.com/

2. IntelliJ Plugin for Android Parcelable boilerplate code generation
   IntelliJ Plugin for Android Parcelable boilerplate code generation.
   Project Address: https://github.com/mcharmas/android-parcelable-intellij-plugin
   Renderings:

3. Android Holo Colors IntelliJ Plugin
   IntelliJ / Android Studio plugin for Android Holo Colors
   Project Address: https://github.com/jeromevdl/android-holo-colors-idea-plugin
   Renderings:

4. Android Drawable Factory
   A Java Application to create appropriate Drawable resources for your Android application
   Project Address: https://github.com/tizionario/AndroidDrawableFactory
   Renderings:

5. SelectorChapek for Android
   Android Studio plugin which automatically generates drawable selectors from appropriately named resources.
   Project Address: https://github.com/inmite/android-selector-chapek

6. Android Action Bar Style Generator
   Easily create a simple, attractive and seamless custom action bar style for your Android application
   Project Address: https://github.com/jgilfelt/android-actionbarstylegenerator
   Online Demo: http://jgilfelt.github.io/android-actionbarstylegenerator/

7. ButterKnifeZelezny
   Android Studio plug-in for generating ButterKnife injections from selected layout XML.
   Project Address: https://github.com/inmite/android-butterknife-zelezny

8. RoboCoP
   Pure Java code generation tool for generating a fully functional ContentProvider for Android.
   Project Address: https://github.com/mediarain/RoboCoP

9. appiconsizes
   IOS and Android App Icon size generator
   Project Address: http://www.appiconsizes.com/

10. Gradle Retrolambda Plugin
    This plugin will automatically build your java or android project with Retrolambda, giving you lambda goodness on java 6 or 7. It relies on the wonderful retrolambda by Esko Luontola.
    Project Address: https://github.com/evant/gradle-retrolambda

11. jsonschema2pojo
    Generates Java types from JSON Schema (or example JSON) and annotates those types for data-binding with Jackson 1.x or 2.x, Gson.
    Project Address: https://github.com/joelittlejohn/jsonschema2pojo
    Online Demo: http://www.jsonschema2pojo.org/

a>

2. Develop self-test related

1. Quality Tools for Android
   This is an Android sample app + tests that will be used to work on various project to increase the quality of the Android platform.
   Project Address: https://github.com/stephanenicolas/Quality-Tools-for-Android

2. android-test-kit
   Google's Testing Tools For Android
   Project Address: https://code.google.com/p/android-test-kit/
   Document: https://code.google.com/p/android-test-kit/w/list

3. robolectric
   Robolectric is a unit test framework that de-fangs the Android SDK so you can test-drive the development of your Android app.
   Project Address: https://github.com/robolectric/robolectric
   Demo Apk: https://github.com/robolectric/robolectricsample
   Document: http://robolectric.org/

4. Android FEST
   A set of FEST assertion helpers geared toward testing Android.
   Project Address: https://github.com/square/fest-android

5. BoundBox
   BoundBox provides an easy way to test an object by accessing all its fields, constructor and methods, public or not. BoundBox breaks encapsulation.
   Project Address: https://github.com/stephanenicolas/boundbox

6. Hugo
   Annotation-triggered method call logging for your debug builds.
   Project Address: https://github.com/JakeWharton/hugo

7. scalpel
   A surgical debugging tool to uncover the layers under your app.
   Project Address: https://github.com/JakeWharton/scalpel

8. Android Screenshot library
   On-demand screenshots for your Android integration tests
   Project Address: https://github.com/rtyley/android-screenshot-lib

9. sonar-android-lint-plugin
   Extension plugin for Android Lint in Sonar
   Project Address: https://github.com/SonarCommunity/sonar-android
   Document: http://docs.codehaus.org/display/SONAR/Android+Plugin
   a>

3. Testing tools

1. Spoon
   Distributing instrumentation tests to all your Androids.
   Project Address: https://github.com/square/spoon
   a>

4. Development and build environment

1. Buck
   Buck is an Android build tool, is more powerful than ant.
   Project Address: https://github.com/facebook/buck

2. Android Maven Plugin
   A plugin for Android application development with Apache Maven 3.1.1+ and the Android SDK.
   Project Address: https://github.com/jayway/maven-android-plugin

3. umeng-muti-channel-build-tool
   Umeng packaing tools
   Project Address: https://github.com/umeng/umeng-muti-channel-build-tool

4. Genymotion
   THE FASTER ANDROID EMULATOR
   Project Address: http://www.genymotion.com/

5. gradle-mvn-push
   Helper to upload Gradle Android Artifacts to Maven repositories
   Project Address: https://github.com/chrisbanes/gradle-mvn-push
   Document: https://github.com/chrisbanes/gradle-mvn-push#usage

6. Android Emulator Plugin for Jenkins
   Android Emulator plugin for Jenkins
   Project Address: https://github.com/jenkinsci/android-emulator-plugin

7. Android Maven Plugin
   A tool to install components of the Android SDK to use with the Maven Android Plugin.
   Project Address: https://github.com/mosabua/maven-android-sdk-deployer

8. SDK Manager Plugin
   Gradle plugin which downloads and manages your Android SDK.
   Project Address: https://github.com/JakeWharton/sdk-manager-plugin
   a>

5. Others

1. ViewServer
   Local server for Android's HierarchyViewer
   Project Address: https://github.com/romainguy/ViewServer

2. GridWichterle for Android
   This app will show grid overlay over whole system which helps you to verify your excellent app design.
   Project Address: https://github.com/inmite/android-grid-wichterle
   Demo Apk: https://play.google.com/store/apps/details?id=eu.inmite.android.gridwichterle

3. Catlog
   Logcat-reading app for Android
   Project Address: https://github.com/nolanlawson/Catlog
   Online Demo: https://play.google.com/store/apps/details?id=com.nolanlawson.logcat

4. PID Cat
   Colored logcat script which only shows log entries for a specific application package.
   Project Address: https://github.com/JakeWharton/pidcat

5. ACRA
   ACRA is a library enabling Android Application to automatically post their crash reports to a GoogleDoc form. It is targetted to android applications developers to help them get data from their applications when they crash or behave erroneously.
   Project Address: https://github.com/ACRA/acra
   Document: https://github.com/ACRA/acra/wiki/BasicSetup

6. Android Resource Navigator
   Chrome Extension providing enhanced resource navigation for GitHub hosted Android projects
   Project Address: https://github.com/jgilfelt/android-resource-navigator
   Online Demo: https://chrome.google.com/webstore/detail/android-resource-navigato/agoomkionjjbejegcejiefodgbckeebo?hl=en&gl=GB
   a>

4. Outstanding individuals and groups

1. Individual

1. JakeWharton
   Github Address: https://github.com/JakeWharton
   Masterpiece: ActionBarSherlock，Android-ViewPagerIndicator，Nine Old Androids，SwipeToDismissNOA，hugo，butterknife，Android-DirectionalViewPager, scalpel
   HomePage: http://jakewharton.com/

2. Chris Banes
   Github Address: https://github.com/chrisbanes
   Masterpiece: ActionBar-PullToRefresh，PhotoView，Android-BitmapCache，Android-PullToRefresh
   HomePage: http://chris.banes.me/

3. Koushik Dutta
   Github Address: https://github.com/koush
   Masterpiece: Superuser，AndroidAsync，UrlImageViewHelper，ion
   HomePage: http://koush.com/

4. Simon Vig
   Github Address: https://github.com/SimonVT
   Masterpiece: android-menudrawer，MessageBar
   HomePage: http://simonvt.net/

5. Manuel Peinado
   Github Address: https://github.com/ManuelPeinado
   Masterpiece: FadingActionBar，GlassActionBar，RefreshActionItem，QuickReturnHeader

6. Emil Sj?lander
   Github Address: https://github.com/emilsjolander
   Masterpiece: StickyListHeaders，sprinkles，android-FlipView
   HomePage: http://emilsjolander.se/

7. greenrobot
   Github Address: https://github.com/greenrobot
   Masterpiece: greenDAO，EventBus
   HomePage: http://greenrobot.de/

8. Jeff Gilfelt
   Github Address: https://github.com/jgilfelt
   Masterpiece: android-mapviewballoons，android-viewbadger，android-actionbarstylegenerator，android-sqlite-asset-helper
   HomePage: http://jeffgilfelt.com

9. Romain Guy
   Github Address: https://github.com/romainguy
   Masterpiece: ViewServer
   HomePage: http://www.curious-creature.org/category/android/
   Other：http://www.flickr.com/photos/romainguy

10. sephiroth74
    Github Address: https://github.com/sephiroth74
    Masterpiece: ImageViewZoom，HorizontalVariableListView，AndroidWheel，purePDF
    HomePage: http://www.sephiroth.it/

11. Cyril Mottier
    Github Address: https://github.com/cyrilmottier
    Masterpiece: GreenDroid，Polaris
    HomePage: http://cyrilmottier.com/
    a>

2. Group

1. Square
   Github Address: https://github.com/square
   Masterpiece: okhttp, fest-android，android-times-square, picasso, dagger, spoon and so on HomePage: http://square.github.io/

2. Inmite s.r.o.
   Github Address: https://github.com/inmite
   Masterpiece: android-styled-dialogs，android-grid-wichterle，android-selector-chapek
   HomePage: http://www.inmite.eu/
   a>

News:

Android Weekly - a free newsletter that helps you remain on the cutting-edge with your Android Development.

Tutorials:

Google's Android Developer Training

CommonsWare - AdvAndroid

Vogella

DZone Javalobby

Java Code Geeks

Architecture:

Ignition - Helps you get your Android applications off the ground quickly by offering ready-to-use components and utility classes

GreenDroid - Makes UI development easier and consistent throughout your applications

Spring For Android - An extension of the Spring Framework that aims to simplify the development of native Android applications

DroidParts - a framework that includes DI, ORM, logging, a REST Client and more

ORM:

OrmLite - Provides some lightweight functionality for persisting Java objects to SQL databases

Active Record for Android - Lightweight persistence library for Android

GreenDao - Open source project to help Android developers working with data stored in SQLite

Design:

Android Patterns - Interaction patterns that can help you design Android apps.

Google Android Design Guide - Official android design guide by Google.

Android App Patterns - 1225 app screenshots in 29 categories all in one.

Android 4.0 Design Startkit - Some starter kits with Photoshop PSD's.

Android Niceties - A collection of screenshots encompassing some of the most beautiful looking Android apps.

Android Holo Colors Generator - Allows you to easily create Android components with your own color scheme

ICS Apps - IceCream sandwich app screenshots

Dependency Injection:

RoboGuice - Smoothes out some of the wrinkles in your Android development and slims down your application code

Android Annotations - Takes care of the plumbing and lets you concentrate on what's really important. By simplifying your code, it facilitates its maintenance.

Networking:

Loopj - An asynchronous, callback-based HTTP client for Android

Volley - It manages the processing and caching of network requests and it saves developers valuable time from writing the same network call/cache code again and again

UI:

ActionBarSherlock - Designed to facilitate the use of the action bar design pattern across all versions of Android with a single API

NineOldAndroids - Library for using the Honeycomb (Android 3.0) animation API on all versions of the platform back to 1.0

Pull To Refresh - Provides a reusable pull-to-refresh widget for Android.

Android Validator - Form validator library

Progress Wheel - A custom component for Android that replaces the progress bar

Scroll Bar Panel - Attaches a view to a scroll indicator

View Page Indicator - Provides widgets compatible with the ViewPager from the Android Support Library and ActionBarSherlock.

View Badger - A simple way to "badge" any given Android view at runtime

Universal Image Loader - Powerful and flexible instrument for asynchronous loading, caching and displaying images

ColorPicker - To create a color picker in preferences

Segmented Radio Button - Implementation of iOS's segmented control

PhotoView - Implementation of ImageView, which supports zooming by various touch gestures

Smart Image View - ImageView replacement that allows image loading from URLs or the contact address book with caching.

Android Lock Pattern - Users can define their own lock pattern ‒ which is a combination of 4+ dots

Testing:

Android Mock - A framework for mocking interfaces and classes on the Dalvik VM

Robotium - A test automation framework that has full support for native and hybrid applications

Tools:

Application Crash Report - ACRA - A library enabling Android Applications to automatically post their crash reports in a GoogleDoc form

Android Studio - A new Android development environment based on IntelliJ IDEA

Hungry for more?

App Dev Wiki

Android Views

Open Intents Android Libraries

Basic4Android Wiki

Vogella Useful Android Libs

``` * In titles means it has been categorized more than once (in different categories) ```
``` * Forked From cesards ```
[LIBRARIES](#libraries) ***     [UI](#ui)      |---[Widgets](#widgetsui)      |          |---[TextView](#textview)      |          |---[Button](#button)      |          |---[EditText](#edittext)      |          |---[ImageView](#imageview)      |          |---[ProgressBar](#progressbar)      |          |---[ListView](#listview)      |          |---[ViewPager](#viewpager)      |          |---[SeekBar](#seekbar)      |          |---[GridView](#gridview)      |          |---[ScrollView](#scrollview)      |          |---[ActionBar](#actionbar)      |          |---[Sliding Views](#slidingviews)      |          |---[Other](#otherwidgets)      |---[Dialogs & Pickers](#dialogspickersui)      |---[Toasts](#toastsui)      |---[Animation](#animationui)      |          |---[Parallax](#parallaxui)      |          |---[Other](#otheranimation)      |---[Maps](#mapsui)      |---[Validation](#validationui)      |---[Camera](#cameraui)      |---[Charts](#chartsui)      |---[Other](#otherui)     [Location](#location)     [Social](#social)     [DB & Preferences](#database)      |          |---[ContentProvider / ContentResolver / Cursor](#databasecp)      |          |---[Preferences](#databasepreferences)      |          |---[Other](#databaseother)

    IO
    Network
    Event Bus
    Tasks
    Open GL
    Dependency Injection
    Testing
    Reverse Engineering
    Bluetooth
    Scan
    File Pickers

EXAMPLES

---

    Network
    Tasks
    Dependency Injection

TOOLS

---

    Proguard
    Testing
    Log
    Localization

OPEN SOURCE APPS

---

    Camera
    P2P
    Chat
    Pedometer
    NFC
    Media
    Other

Libraries

UI

Widgets

TextView

Title	Description
AutoFit TextView	A TextView that automatically resizes text to fit perfectly within its bounds
Token AutoComplete	Gmail style MultiAutoCompleteTextView for Android
Android RobotoTextView	Implementation of a TextView and all its direct/indirect subclasses with native support for the Roboto fonts, includes the brand new Roboto Slab fonts
Android Ago	An Android TextView that always displays an auto refreshing relative time span with respect to a reference time
Timely TextView	Animated TextView like Timely app
Email AutoComplete TextView	An AutoCompleteTextView optimized for email auto-complete
Shimmer Android	An Android TextView with a shimmering effect
Titanic	Android experiment showing a sinking TextView
Blink TextView	Remember the '90s? Geocities? Blinking text? Dat. On Android
Secret TextView	A TextView that simulates the effect from the app Secret where the characters fade in/out at different speeds

Button

Title	Description
Android Process Button	Custom android button which can indicate progress

EditText

Title	Description
Float Label EditText	Floating hint from edit text
EditText Mentions	EditText subclass with mentions detection (like Facebook or Twitter)
History EditText	Android EditText that auto-saves previous values and displays them in a dropdown when used again
Single Input Form	A single EditText instead of a classical form

ImageView

Title	Description
Ken Burns View	Android ImageViews animated by Ken Burns Effect
PhotoView	Implementation of ImageView for Android that supports zooming, by various touch gestures
Circle ImageView	A circular ImageView for Android
Custom Shape ImageView	Custom shape ImageView using PorterDuffXfermode with paint shapes and SVGs
Rounded ImageView	a fast ImageView that supports rounded corners and ovals or circles
Flip ImageView	Small android lib allowing you to make a flip imageview easily, by extending FlipImageView
Glide	An image loading and caching library for Android focused on smooth scrolling
Circular ImageView	Custom view for circular images in Android while maintaining the best draw performance

ProgressBar

Title	Description
Android Holo Circular ProgressBar	is a Custom View implementation for Android you might know from the Android Clock
Google ProgressBar	Android library to display progress like google does in some of his services
Smooth ProgressBar	A small Android library allowing you to have a smooth and customizable horizontal indeterminate ProgressBar
Progress Wheel	A progress wheel for android, intended for use instead of the standard progress bar
Number ProgressBar	A more beautiful, slim, sexy Android progressbar
Android Process Button *	Custom android button which can indicate progress

ListView

Title	Description
Flabby ListView	Android library to display a ListView which cells are not rigid but flabby and react to ListView scroll and touch events
Dob List	DobLis is an Open Source Android library that provides to ListView adding ProgressBar (or any view) to the footer of ListView to be shown in loading more, and callback that is called when reaching last item in ListView
Android Swipe ListView	An Android List View implementation with support for drawable cells and many other swipe related features
Multi Choice Adapter	A ListView adapter with support for multiple choice modal selection
Jazzy ListView	JazzyListView is an extension of ListView designed to animate list item views as they become visible
ListView Animations	An Android library which allows developers to easily add animations to ListView items
Slide Expandable ListView	A better ExpandableListView, with animated expandable views for each list item
Swipe ListView	An Android List View implementation with support for drawable cells and many other swipe related features
Super ListView	Way more than just a listview

ViewPager

Title	Description
Jazzy ViewPager	An easy to use ViewPager that adds an awesome set of custom swiping animations. Just change your ViewPagers to JazzyViewPagers, two more steps, and you're good to go!
Android ViewPager Indicator	Paging indicator widgets compatible with the ViewPager from the Android Support Library and ActionBarSherlock
Salvage	Generic view recycler and ViewPager PagerAdapter implementation
Android Auto Scroll ViewPager	auto scroll ViewPager or ViewPager in ViewPager. http://www.trinea.cn/
Pager Sliding Tab Strip	An interactive indicator to navigate between the different pages of a ViewPager
Numeric Page Indicator	A ViewPager page indicator that displays the current page number and (optionally) the page count
Wizard Pager	Wizard Pager is a library that provides an example implementation of a Wizard UI on Android, it's based of Roman Nurik's wizard pager (https://code.google.com/p/romannurik-code/source/browse/misc/wizardpager)
ViewPager Transformations	Library containing common animations needed for transforming ViewPager scrolling for Android v13+

SeekBar

Title	Description
Start Point SeekBar	StartPointSeekBar is a custom view for the Android platform that makes it possible to have a SeekBar to have custom start point

GridView

Title	Description
Asymmetric GridView	Crazy-ass Android GridView with asymmetric items
Sticky Grid Headers	An Android Library that makes it easy to make grid views with sectioned data and headers that stick to the top. http://tonicartos.github.io/StickyGridHeaders/

ScrollView

Title	Description
Discroll View	Scroll + discover = DiscrollView

ActionBar

Title	Description
Not Boring ActionBar	News Stand app makes the ActionBar not boring!
Glass ActionBar	A library that adds a glass-like effect to the action bar
Fading ActionBar	Android library implementing a fading effect for the action bar, similar to the one found in the Play Music app
ActionBar PullToRefresh	A modern implementation of the pull-to-refresh interaction for #android
Refresh Action Item	An action bar item which acts both as a refresh button and as a progress indicator

Sliding Views

Title	Description
Android Sliding Up Panel	This type of a panel is a common pattern also used in the Google Music app and the Rdio app
DobSliding	DobSliding is an Open Source Android library that allows developers to develop applications with vertical sliding menus just like the Android notifications menu
Android Menu Drawer	A slide-out menu implementation, which allows users to navigate between views in your app. http://simonvt.github.com/android-menudrawer/
Sliding Menu	An Android library that allows you to easily create applications with slide-in menus
Side Navigation	Implementation of "SIde Navigation" or "Fly-in app menu" pattern for Android (based on Google+ app). http://johnkil.github.com/SideNavigation

Other

Title	Description
Android FlipView	A small, easy to use android library for implementing flipping between views as seen in the popular Flipboard application
Android Flip	A component for flip animation on Android, which is similar to the effect in Flipboard iPhone/Android
Android PDF View	A fast PDF reader component for Android development
Android ViewBadger	A simple way to "badge" any given Android view at runtime without having to cater for it in layout
Quilt View Library	QuiltView displays views of different sizes in a scrollable grid
FreeFlow	A layout engine for Android that decouples layouts from the View containers that manage scrolling and view recycling. FreeFlow makes it really easy to create custom layouts and beautiful transition animations as data and layouts change
Draggable Panel	Android library used to create an awesome Android UI based on a draggable element similar to the last YouTube graphic component
Android Reside Menu	The idea of ResideMenu is from Dribbble 1 and 2. It has come true and run in iOS devices. iOS ResideMenu This project is the RefsideMenu Android version. The visual effect is partly referred to iOS version of ResideMenu
ShowCase View	Highlight the best bits of your app to users quickly, simply, and cool. http://amlcurran.github.io/ShowcaseView/
Foldable Layout	Android widgets to implement folding animation
Image Layout	Android - A layout that arranges its children in relation to a background image
Swipeable cards	A native library providing a Tinder-like cards effect. A card can be constructed using an image and displayed with animation effects, dismiss-to-like and dismiss-to-unlike, and use different sorting mechanisms

Dialogs & Pickers

Title	Description
Update Checker	Increase your app's updates
Android Style Dialogs	A simple library for styling Android dialogs in the Holo theme. It also removes boilerplate code for displaying simple dialogs
DateTime Picker	DateTimePicker is a library which contains the beautiful DatePicker that can be seen in the new Google Agenda app
Recurrence Picker	Google Calendar Recurrence picker

Toasts

Title	Description
Android AppMsg	In-layout notifications. Based on Toast notifications and article by Cyril Mottier (http://android.cyrilmottier.com/?p=773)
Super Toasts	A library that extends the Android toast framework
Message Bar	An Android Toast replacement, similar to the one seen in the GMail app. http://simonvt.github.com/MessageBar/
Undo Bar	The UI component for Android advanced UI pattern undo-bar, used in Gmail app, create by Roman Nurik. http://soarcn.github.io/UndoBar

Animation

Parallax

Title	Description
Motion	An Android library allowing images to exhibit a parallax effect
Parallax Pager	Add some depth to your Android scrolling

Other

Title	Description
Android Sliding Up Panel *	Android Sliding Up Panel Demo
Android FlipView *	A small, easy to use android library for implementing flipping between views as seen in the popular Flipboard application
Android Flip *	A component for flip animation on Android, which is similar to the effect in Flipboard iPhone/Android
Flabby ListView *	Android library to display a ListView which cells are not rigid but flabby and react to ListView scroll and touch events
FreeFlow *	A layout engine for Android that decouples layouts from the View containers that manage scrolling and view recycling. FreeFlow makes it really easy to create custom layouts and beautiful transition animations as data and layouts change
Ken Burns View *	Android ImageViews animated by Ken Burns Effect
Draggable Panel *	Android library used to create an awesome Android UI based on a draggable element similar to the last YouTube graphic component
DobSliding *	DobSliding is an Open Source Android library that allows developers to develop applications with vertical sliding menus just like the Android notifications menu
Jazzy ListView *	JazzyListView is an extension of ListView designed to animate list item views as they become visible
ListView Animations *	An Android library which allows developers to easily add animations to ListView items
Slide Expandable ListView *	A better ExpandableListView, with animated expandable views for each list item
Sticky List Headers	An android library for section headers that stick to the top
Android ScrollBar Panel	Android ScrollBarPanel allows to attach a View to a scroll indicator like it's done in Path 2.0
Foldable Layout *	Android widgets to implement folding animation
Animation Easing Functions	Android Animation Easing Functions. Let's make animation more real!
Android View Animations	Cute view animation collection

Maps

Title	Description
Clusterer	Clustering in Maps v2 for Android

Validation

Title	Description
Android Saripaar	UI Validation Library for Android

Camera

Title	Description
Easy Camera	Wrapper around the android Camera class that simplifies its usage

Charts

Title	Description
Eaze Graph	An Android chart and graph library

Other

Title	Description
Shake Detector	This library provides a easy way to detect a shake movement using the build-in accelerometer and fire a callback on the UI thread every times it happens
Android Face Cropper	Android bitmap Face Cropper

Location

Title	Description
Fluffy	Battery-friendly background location updates for Android, using Google Play Location where available
Fused Location	This project aims to bring the Fused location provider to android apps without requiring the Play Services library
Reactive Location	Small library that wraps Google Play Service API in brilliant RxJava Observables reducing boilerplate to minimum

Social

Title	Description
Twitter 4J	Twitter4J is an open-sourced, mavenized and Google App Engine safe Java library for the Twitter API
Twitter Android SDK	Twitter SDK for Android, using Twitter4j
Facebook Android SDK	Use the Facebook SDK for Android to integrate with Facebook, help build engaging social apps
Android Social Networks	Library for easy work with Facebook, Twitter, LinkedIn and Google on Android

DB & Preferences

ContentProvider / ContentResolver / Cursor

Title	Description
Android DB Commons	Some common utilities for ContentProvider/ContentResolver/Cursor and other db-related android stuff
Schematic	Automatically generate ContentProviders
Android Content Provider Generator	A small tool to generate an Android ContentProvider

Preferences

Title	Description
Esperandro	Easy SharedPreference Engine for Android
Secure Preferences	Android SharedPreference wrapper that encrypts keys and values of Shared Preferences. It's not bullet proof security but rather a quick win for incrementally making your android app more secure
AES Secure Preferences	Secure AES Encryiption decorated Android Shared Preferences implementation

Other

Title	Description
Snappy DB	A key-value database for Android
Cupboard	Cupboard for Android is simple persistence that gets out of your way and is easy to add to your existing code base
Android SQLite Asset Helper	An Android helper class to manage database creation and version management using an application's raw asset files
Sprinkles	Sprinkles is a boiler-plate-reduction-library for dealing with databases in android applications
Sugar	Insanely easy way to work with Android Database. http://satyan.github.com/sugar/

IO

Title	Description
Conceal	Conceal provides easy Android APIs for performing fast encryption and authentication of data, such as that stored on SD cards. http://facebook.github.io/conceal/

Network

Title	Description
Merlin	Observes network connection status & gives callbacks
Robospice	RoboSpice is a modular android library that makes writing asynchronous long running tasks easy. It is specialized in network requests, supports caching and offers REST requests out-of-the box using extension modules
Android Volley	Android Volley Mirror
Retrofit	Type-safe REST client for Android and Java by Square, Inc
OkHttp	An HTTP+SPDY client for Android and Java applications
KSOAP 2 Android	Lightweight and efficient SOAP client library for the Android platform
Android Async Http	An Asynchronous HTTP Library for Android
Android SSL TrustKiller	Bypass SSL certificate pinning for most applications

Event Bus

Title	Description
Otto	An enhanced Guava-based event bus with emphasis on Android support.
http://square.github.io/otto/
EventBus	Android optimized event bus that simplifies communication between Activities, Fragments, Threads, Services, etc. Less code, better quality

Tasks

Title	Description
Robospice *	RoboSpice is a modular android library that makes writing asynchronous long running tasks easy. It is specialized in network requests, supports caching and offers REST requests out-of-the box using extension modules
Bolts Android	Bolts is a collection of low-level libraries designed to make developing mobile apps easier

Open GL

Title	Description
Android Page Curl	An example application for creating page curl/flip effect on Android using OpenGL ES

Dependency Injection

Title	Description
Butterknife	View "injection" library for Android

Testing

Title	Description
Robotium	Like Selenium, but for Android
Spoon	Distributing instrumentation tests to all your Androids
Fest Android	A set of FEST assertion helpers geared toward testing Android
Double Espresso	A pure Gradle port of the Espresso testing utility for Android

Reverse Engineering

Title	Description
JadX	Dex to Java decompiler

File Pickers

Title	Description
NoNonSense File Picker	A file/directory-picker for android. Implemented as a library project

Bluetooth

Title	Description
Android Bluetooth SPP	Bluetooth Serial Port Profile which comfortable to developer application to communication with microcontroller via bluetooth

Scan

Title	Description
ZXing	Official ZXing ("Zebra Crossing") project home
ZXing Android Minimal	Port of the ZXing Android application as a minimal Android library project, for embedding in other Android applications
ZXing Fragment	Barcode scanner for Android fragments. Compatible with Android 2.1+
Barcode Scanner	Barcode Scanner Libraries for Android

Samples

Network

Title
Robospice Samples

Tasks

Title
Robospice Samples *

Dependency Injection

Title
Android Dagger Example

Tools

Proguard

Title	Description
Facebook Proguard	A faster fork of ProGuard. Based off of ProGuard 4.11 (http://sourceforge.net/p/proguard/code/ci/proguard4.11/tree/)

Testing

Title	Description
Quality Tools for Android	This is an Android sample app + tests that will be used to work on various project to increase the quality of the Android platform

Log

Title	Description
Hugo	Annotation-triggered method call logging for your debug builds
Phone Home	PhoneHome is a standalone library that sends logs from remote Android devices to a central server for debugging. PhoneHome requires nothing of end users
Timber	A logger with a small, extensible API which provides utility on top of Android's normal Log class. http://jakewharton.github.io/timber/
Debug Log	Create a simple and more understandable Android logs

Localization

Title	Description
DexterApps Translation Util	Automatic String Translation Utility for Android and iOS

Open Source Apps

Camera

Title	Description
PhotoUp

P2P

Title	Description
Transdroid	Manage your torrents from your Android device

Chat

Title	Description
Conversations	Conversations is an open source XMPP (formally known as Jabber) client for Android 4.0+ smart phones
Text Secure	A secure text messaging application for Android

Pedometer

Title	Description
Step Counter	A Step Counter for Android KitKat devices with Built-in Pedometers

NFC

Title	Description
Farebot	Read data from public transit cards using your NFC Android phone!

Media

Title	Description
Mizuu	Popular media indexer app for Android. http://mizuu.tv
Exo Player	Google Media Player Open Source project

Other

Title	Description
Financius	Personal expense manager
Gaug.es Android	Gaug.es Android App
White House Android	White House application for Android
Ac Display	AcDisplay is a new way of handling notifications in Android. http://acdisplay.artemchep.com
Google I/O	Google I/O application
Wordpress Android	WordPress for Android. http://android.wordpress.org
One Bus Away	The official Android app for OneBusAway.
http://www.onebusaway.org/

###Table of contents

• Framework
• EventBus
• Orm
• [Image Loading](#Image Loading)
• Animations
• Network
• Widget
  • Material
  • UI
  • TextView/EditText
  • ImageView
  • Button
  • [Progressbar/Progress View](#Progressbar/Progress View)
  • Menu
  • Dialog
  • ListView/ScrollView
  • GridView
  • RatingView
  • Recyclerview
  • ViewPager
  • ActionBar
  • Fragment
  • Tabs
  • Toast
  • SeekBar
  • [Calendar View](#Calendar View)
  • Layout
  • Other
• Template
• Adapter
• Validation
• Gesture
• [Game Engine](#Game Engine)
• Bluetooth
• SocialNetworks
• XMPP
• Plugin
• [Code Generation](#Code Generation)
• Media
• Embedded
• Utility
• SDK
• Test
• Chart
• Icons
• Colors
• Font
• OpenGL
• Debug
• Demo
• App
• Security
• Tools
• Decompiler
• [Gradle plugin](#Gradle plugin)
• [Android Wear](#Android Wear)
• Other

###</ Framework

1. roboguice Google Guice on Android, version 2.0
   https://github.com/roboguice/roboguice
2. AndroidAnnotations Fast Android Development. Easy maintainance.
   https://github.com/excilys/androidannotations
3. afinal Afinal是一个android的ioc，orm框架
   https://github.com/yangfuhai/afinal
4. xUtils** android orm, bitmap, http, view inject...
   https://github.com/wyouflf/xUtils
5. ThinkAndroid ThinkAndroid是一个免费的开源的、简易的、遵循Apache2开源协议发布的Android开发框架，其开发宗旨是简单、快速的进行 Android应用程序的开发
   https://github.com/white-cat/ThinkAndroid
6. KJFrameForAndroid KJFrameForAndroid 又叫KJLibrary，是一个android的orm 和 ioc 框架。
   https://github.com/kymjs/KJFrameForAndroid
7. dagger A fast dependency injector for Android and Java.
   https://github.com/square/dagger
8. droidparts DI, ORM, JSON, ...
   https://github.com/yanchenko/droidparts
9. butterknife View "injection" library for Android.
   https://github.com/JakeWharton/butterknife
10. android-common Android common lib, include ImageCache, HttpCache, DropDownListView, DownloadManager, Utils and so on
    https://github.com/Trinea/android-common
11. android-priority-jobqueue A Job Queue specifically written for Android to easily schedule jobs (tasks) that run in the background, improving UX and application stability.
    https://github.com/path/android-priority-jobqueue
12. SAF SAF(Simple Android Framework)是一个简单的android框架，它为开发Android app提供了基础性组件。
    https://github.com/fengzhizi715/SAF
13. AndroidBinding MVVM for Android
    https://github.com/gueei/AndroidBinding
14. RoboBinding A data-binding Presentation Model(MVVM) framework for the Android platform.
    https://github.com/RoboBinding/RoboBinding
15. androidkit android开发框架，可以帮助你大量提高android应用开发效率。
    https://github.com/msdx/androidkit
16. transfuse Transfuse - A Dependency Injection and Integration framework for Google Android
    https://github.com/johncarl81/transfuse
17. xCombine Android Plugin Framework
    https://github.com/wyouflf/xCombine
18. LoonAndroid 整个框架式不同于androidannotations，Roboguice等ioc框架，这是一个类似spring的实现方式。在整应用的生命周期中找到切入点，然后对activity的生命周期进行拦截，然后插入自己的功能。
    https://github.com/gdpancheng/LoonAndroid
19. UltimateAndroid UltimateAndroid is a framework to help developing Android apps in a fast way
    https://github.com/cymcsg/UltimateAndroid
20. BeeFramework_Android 极简化的Android App开发框架和App内调试工具
    https://github.com/BeeFramework/BeeFramework_Android
21. RoboMVVM MVVM framework for Android
    https://github.com/debdattabasu/RoboMVVM
22. Android-Next A Android Commons Library, include task, cache, http, custom views, utils, and so on.
    https://github.com/mcxiaoke/Android-Next
23. SwissKnife A multi-purpose library containing view injection and threading for Android using annotations
    https://github.com/Arasthel/SwissKnife
24. QuickAndroid 一个快速、完善的Android开发框架整合实践
    https://github.com/alafighting/QuickAndroid
25. CJFrameForAndroid CJFrameForAndroid 是一个实现android插件化开发的框架。使用CJFrameForAndroid，apk动态加载不再是难题，更重要的是可以轻松实现插件与APP项目之间的解耦。
    https://github.com/kymjs/CJFrameForAndroid

###</ EventBus

1. EventBus Android optimized event bus that simplifies communication between Activities, Fragments, Threads, Services, etc. Less code, better quality.
   https://github.com/greenrobot/EventBus
2. otto An enhanced Guava-based event bus with emphasis on Android support.
   https://github.com/square/otto
3. Guava's event bus Guava's event bus utility, explained.
   https://code.google.com/p/guava-libraries/wiki/EventBusExplained
4. RxJava RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.
   https://github.com/ReactiveX/RxJava
5. RxAndroid RxJava bindings for Android
   https://github.com/ReactiveX/RxAndroid
6. tinybus A lightweight and simple event bus optimized for Android
   https://github.com/beworker/tinybus
7. NetworkEvents Android library listening network connection state and change of the Wifi signal strength
   https://github.com/pwittchen/NetworkEvents
8. AndroidEventBus A lightweight eventbus library for android, simplifies communication between Activities, Fragments, Threads, Services, etc.
   https://github.com/bboyfeiyu/AndroidEventBus

###</ Orm

1. greenDAO greenDAO is a light & fast ORM solution for Android that maps objects to SQLite databases.
   https://github.com/greenrobot/greenDAO
2. ormlite ORMLite Android functionality used in conjunction with ormlite-core
   https://github.com/j256/ormlite-android
3. ActiveAndroid Active record style SQLite persistence for Android
   https://github.com/pardom/ActiveAndroid
4. sugar Insanely easy way to work with Android Database.
   https://github.com/satyan/sugar
5. androrm An Object Relational Mapper for Android.
   https://github.com/androrm/androrm/
6. orman lightweight and practical ORM for Java/Android. works with SQLite & MySQL.
   https://github.com/ahmetalpbalkan/orman
7. ormdroid ORMDroid is a simple ORM persistence framework for your Android applications.
   https://github.com/roscopeco/ormdroid
8. android-sqlite-asset-helper An Android helper class to manage database creation and version management using an application's raw asset files
   https://github.com/jgilfelt/android-sqlite-asset-helper
9. sprinkles Sprinkles is a boiler-plate-reduction-library for dealing with databases in android applications
   https://github.com/emilsjolander/sprinkles
10. android-database-sqlcipher Android SQLite API based on SQLCipher
    https://github.com/sqlcipher/android-database-sqlcipher
11. couchbase-lite-android Lightweight, embedded, syncable NoSQL database engine for Android.
    https://github.com/couchbase/couchbase-lite-android
12. SimpleNoSQL A simple NoSQL client for Android. Meant as a document store using key/value pairs and some rudimentary querying. Useful for avoiding the hassle of SQL code.
    https://github.com/Jearil/SimpleNoSQL
13. SQLiteProvider Extended SQLite functionality for Android
    https://github.com/novoda/SQLiteProvider
14. Android-AnnotatedSQL Android library for auto generating SQL schema and Content provider
    https://github.com/hamsterksu/Android-AnnotatedSQL
15. DBExecutor DBExecutor
    https://github.com/LuckyJayce/DBExecutor
16. LitePal An Android library that allows developers to use SQLite database extremely easy.
    https://github.com/LitePalFramework/LitePal
17. realm-java Realm is a mobile database: a replacement for SQLite & ORMs
    https://github.com/realm/realm-java
18. DBFlow A blazing fast, powerful, and very simple ORM android database library that writes database code for you.
    https://github.com/agrosner/DBFlow

###</ Image Loading

1. Android-Universal-Image-Loader Powerful and flexible library for loading, caching and displaying images on Android.
   https://github.com/nostra13/Android-Universal-Image-Loader
2. picasso A powerful image downloading and caching library for Android
   https://github.com/square/picasso
3. picasso-transformations An Android transformation library providing a variety of image transformations for Picasso
   https://github.com/wasabeef/picasso-transformations
4. ion Android Asynchronous Networking and Image Loading
   https://github.com/koush/ion
5. glide An image loading and caching library for Android focused on smooth scrolling
   https://github.com/bumptech/glide
6. glide-transformations An Android transformation library providing a variety of image transformations for Glide.
   https://github.com/wasabeef/glide-transformations
7. ImageLoader Library for async image loading and caching on Android
   https://github.com/novoda/ImageLoader
8. webimageloader Library to handle asynchronous image loading on Android.
   https://github.com/lexs/webimageloader
9. AndroidImageLoader Andorid library that loads images asynchronously into cache using a thread pool
   https://github.com/wuman/AndroidImageLoader

###</ Animations

1. ListViewAnimations An Android library which allows developers to easily add animations to ListView items
   https://github.com/nhaarman/ListViewAnimations
2. NineOldAndroids Android library for using the Honeycomb animation API on all versions of the platform back to 1.0!
   https://github.com/JakeWharton/NineOldAndroids
3. android-flip A component for flip animation on Android, which is similar to the effect in Flipboard iPhone/Android
   https://github.com/openaphid/android-flip
4. AndroidViewAnimations Cute view animation collection.
   https://github.com/daimajia/AndroidViewAnimations
5. AnimationEasingFunctions Android Animation Easing Functions. Let's make animation more real!
   https://github.com/daimajia/AnimationEasingFunctions
6. ViewPagerTransforms Library containing common animations needed for transforming ViewPager scrolling for Android v13+.
   https://github.com/ToxicBakery/ViewPagerTransforms
7. TransitionsBackport A backport of the new Transitions API for Android
   https://github.com/guerwan/TransitionsBackport
8. RecyclerViewItemAnimators This repo provides simple animators for the item views in the RecyclerView This code is cloned from DefaultItemAnimator provided by Google customizing the animations.
   https://github.com/gabrielemariotti/RecyclerViewItemAnimators
9. ParallaxPagerTransformer A pager for Android with parallax effect
   https://github.com/xgc1986/ParallaxPagerTransformer
10. android-page-curl Page Curl for Android
    https://github.com/MysticTreeGames/android-page-curl
11. android-cubic-bezier-interpolator An Android Library that helps you implement bezier animations in you application
    https://github.com/codesoup/android-cubic-bezier-interpolator
12. ActivityTransition An android project presenting some transitions you can use between activities
    https://github.com/ophilbert/ActivityTransition
13. EasyAndroidAnimations Easy Android Animations is an animation library that aims to make android animations easier, with 50+ builtin animations, it allows you to introduce many complex animation effects in your application with one or two lines of code.
    https://github.com/2359media/EasyAndroidAnimations
14. AndroidImageSlider An amazing and convenient Android image slider.
    https://github.com/daimajia/AndroidImageSlider
15. transitions-everywhere Backport of Transitions API from Android 4.4. Compatible with Android 2.2+
    https://github.com/andkulikov/transitions-everywhere
16. android-ripple-background A beautiful ripple animation for your app
    https://github.com/skyfishjy/android-ripple-background
17. CircleIndicator a lightweight viewpager indicator like in nexus 5 launcher
    https://github.com/ongakuer/CircleIndicator
18. Interactive-animation Collect android animation
    https://github.com/Rano1/Interactive-animation
19. Slidr Easily add slide to dismiss functionality to an Activity
    https://github.com/r0adkll/Slidr
20. CircularReveal Lollipop ViewAnimationUtils.createCircularReveal for everyone 2.3+
    https://github.com/ozodrukh/CircularReveal
21. BaseAnimation BaseAnimation network Android animation set, custom controls, nearly 200 kinds of source code！ BaseAnimation, if a new version is updated automatically to remind everyone, I hope everyone will contribute their animated XML files or other source, together to create this open source app！
    https://github.com/z56402344/BaseAnimation

###</ Network

1. android-async-http An Asynchronous HTTP Library for Android
   https://github.com/loopj/android-async-http
2. okhttp An HTTP+SPDY client for Android and Java applications.
   https://github.com/square/okhttp
3. retrofit Type-safe REST client for Android and Java by Square, Inc.
   https://github.com/square/retrofit
4. AndroidAsync Asynchronous socket, http (client+server), websocket, and socket.io library for android. Based on nio, not threads.
   https://github.com/koush/AndroidAsync
5. async-http-client Asynchronous Http and WebSocket Client library for Java
   https://github.com/AsyncHttpClient/async-http-client
6. http-request Java HTTP Request Library
   https://github.com/kevinsawicki/http-request
7. android-lite-http Arrow(LiteHttp) is a simple, intelligent and flexible HTTP client for Android.
   https://github.com/litesuits/android-lite-http
8. robospice Repo of the Open Source Android library : RoboSpice. RoboSpice is a modular android library that makes writing asynchronous long running tasks easy. It is specialized in network requests, supports caching and offers REST requests out-of-the box using extension modules.
   https://github.com/stephanenicolas/robospice
9. volley volley https://github.com/mcxiaoke/android-volley
10. enhanced-volley An enhanced version of the Volley Networking Toolkit for Android
    https://github.com/vinaysshenoy/enhanced-volley
11. unirest-java Unirest in Java: Simplified, lightweight HTTP client library.
    https://github.com/mashape/unirest-java/
12. wasp Android Network Solution
    https://github.com/orhanobut/wasp

###</ Widget ####</ Material

1. MaterialDesignLibrary This is a library with components of Android L to you use in android 4.0
   https://github.com/navasmdc/MaterialDesignLibrary#flat-button
2. Carbon Material Design implementation for Android 2.1+. Realtime shadows, ripples, animations, SVGs and more. https://github.com/ZieIony/Carbon
3. MaterialEverywhere Showcase of the new AppCompat 21, which includes new Material Theme, working in pre-21 devices.
   https://github.com/antoniolg/MaterialEverywhere
4. MaterialWidget Android L design widget in Android 4.0 ~ 4.4.
   https://github.com/keithellis/MaterialWidget
5. MaterialTabs Custom Tabs with Material Design effects. It requires 14+ API and android support v7 (Toolbar)
   https://github.com/neokree/MaterialTabs
6. material-ripple Android L Ripple effect wrapper for Views
   https://github.com/balysv/material-ripple
7. RippleEffect Implementation of Ripple effect from Material Design for Android API 14+
   https://github.com/traex/RippleEffect
8. LDrawer Android drawer icon with material design animation
   https://github.com/ikimuhendis/LDrawer
9. material-design-icons Material Design icons by Google
   https://github.com/google/material-design-icons
10. AndroidMaterialDesignToolbar Android Sample Project with Material Design and Toolbar.
    https://github.com/tekinarslan/AndroidMaterialDesignToolbar
11. MaterialEditText EditText in Material Design
    https://github.com/rengwuxian/MaterialEditText
12. material-menu Morphing Android menu, back, dismiss and check buttons
    https://github.com/balysv/material-menu
13. material-dialogs Not even AppCompat uses Material theming for AlertDialogs on pre-Lollipop. This is a beautiful and easy solution.
    https://github.com/afollestad/material-dialogs
14. MaterialNavigationDrawer Navigation Drawer Activity with material design style and simplified methods
    https://github.com/neokree/MaterialNavigationDrawer
15. MaterialDialog An Android library for conveniently building Material Design Dialog in Android version 2.2 ~ L.
    https://github.com/drakeet/MaterialDialog
16. materialish-progress A material style progress wheel compatible with 2.3
    https://github.com/pnikosis/materialish-progress
17. MaterialList An Android library aimed to get the beautiful CardViews that Google shows at its official design specifications
    https://github.com/dexafree/MaterialList
18. android-floating-action-button Floating Action Button for Android based on Material Design specification
    https://github.com/futuresimple/android-floating-action-button
19. Android-Material-circular-button Animated Material circular button
    https://github.com/glomadrian/Android-Material-circular-button
20. material-drawer DrawerLayout implementation for Material design apps
    https://github.com/HeinrichReimer/material-drawer
21. snackbar Snackbar Android Library
    https://github.com/nispok/snackbar
22. Android-DialogFragments Various DialogFragments for Android.
    https://github.com/wada811/Android-DialogFragments
23. material-range-bar Android widget for selecting a range of values.
    https://github.com/oli107/material-range-bar
24. CircularProgressView A Material style circular progress bar for Android
    https://github.com/rahatarmanahmed/CircularProgressView
25. RippleDrawable A port of Ripple Effect from Android L to non L devices
    https://github.com/ozodrukh/RippleDrawable
26. MaterialDrawer A simple take on creating a easy to use and fast material drawer implementation
    https://github.com/mikepenz/MaterialDrawer

####</ UI

1. android-ui Android UI library. Requires API level 14+
   https://github.com/markushi/android-ui
2. GreenDroid GreenDroid is a development library for the Android platform. It makes UI developments easier and consistent through your applications.
   https://github.com/cyrilmottier/GreenDroid
3. FlatUI CengaLabs - Android FlatUI Kit
   https://github.com/eluleci/FlatUI
4. EffectiveAndroidUI Sample project created to show some of the best Android practices to work in the Android UI Layer. The UI layer of this project has been implemented using MVP or MVVM (without binding engine) to show how this patterns works. This project is used during the talk "EffectiveAndroidUI".
   https://github.com/pedrovgs/EffectiveAndroidUI
5. ParallaxEverywhere Parallax everywhere is a library with alternative android widgets with parallax effects.
   https://github.com/Narfss/ParallaxEverywhere

####</ TextView/EditText

1. Shimmer-android An Android TextView with a shimmering effect
   https://github.com/RomainPiel/Shimmer-android
2. Titanic Android experiment showing a sinking TextView
   https://github.com/RomainPiel/Titanic
3. emojicon A library to show emoji in TextView, EditText (like WhatsApp) for Android
   https://github.com/rockerhieu/emojicon
4. android-autofittextview A TextView that automatically resizes text to fit perfectly within its bounds.
   https://github.com/grantland/android-autofittextview
5. Android-RobotoTextView Implementation of a TextView and all its direct/indirect subclasses with native support for the Roboto fonts, includes the brand new Roboto Slab fonts.
   https://github.com/johnkil/Android-RobotoTextView
6. SizeAdjustingTextView This is based on an open source autosizing textview for Android.
   https://github.com/erchenger/SizeAdjustingTextView
7. SecretTextView A TextView that simulates the effect from the app Secret where the characters fade in/out at different speeds.
   https://github.com/matthewrkula/SecretTextView
8. anytextview An extension of Android's TextView and EditText that let's you use the font of your choice
   https://github.com/hanspeide/anytextview
9. android-formidable-validation Form validation and feedback library for Android. Provides .setText for more than just TextView and EditText widgets. Provides easy means to validate with dependencies.
   https://github.com/coreform/android-formidable-validation
10. android-edittext-validator Android form edit text is an extension of EditText that brings data validation facilities to the edittext.
    https://github.com/vekexasia/android-edittext-validator
11. chips-edittext-library Chips EditText, Token EditText, Bubble EditText, Spannable EditText and etc.. There are many names of this control. Here I develop easy to understand , modify and integrate Chips Edit Text widget for Android
    https://github.com/kpbird/chips-edittext-library
12. FloatingLabel FloatingLabel Allows you to create a blow kind of EditText.
    https://github.com/hardik-trivedi/FloatingLabel
13. AndroidFloatLabel Float Label Edit Texts for Android
    https://github.com/weddingparty/AndroidFloatLabel
14. AndroidFloatLabel Library project with a custom view that implements the Float Label pattern
    https://github.com/IanGClifton/AndroidFloatLabel
15. TokenAutoComplete Gmail style MultiAutoCompleteTextView for Android
    https://github.com/splitwise/TokenAutoComplete
16. TextJustify-Android Android Text Full Jusiftication / Wrapping / Justify
    https://github.com/bluejamesbond/TextJustify-Android
17. RoundedLetterView RoundedLetterView like the one in Android 5.0 Contacts app
    https://github.com/pavlospt/RoundedLetterView
18. Android-SingleInputForm A single EditText instead of a classical form. Library that implements flavienlaurent's singleinputform
    https://github.com/HeinrichReimer/Android-SingleInputForm
19. BabushkaText A simpler way to style your TextViews
    https://github.com/quiqueqs/BabushkaText
20. MatchView Include MatchTextView and MatchButton..Come..you will like it
    https://github.com/Rogero0o/MatchView
21. ExpandableTextView Android's TextView that can expand/collapse like the Google Play's app description
    https://github.com/Manabu-GT/ExpandableTextView
22. AccountAutoCompleteEditText Simple extension for account suggestion and auto completion.
    https://github.com/KeithYokoma/AccountAutoCompleteEditText
23. TokenAutoComplete Gmail style MultiAutoCompleteTextView for Android
    https://github.com/splitwise/TokenAutoComplete
24. AwesomeText A tool that facilitates working with Spans on TextViews or any extension of them (EditTexts, Buttons...).
    https://github.com/JMPergar/AwesomeText

####</ ImageView

1. PhotoView Implementation of ImageView for Android that supports zooming, by various touch gestures.
   https://github.com/chrisbanes/PhotoView
2. android-smart-image-view Android ImageView replacement which allows image loading from URLs or contact address book, with caching
   https://github.com/loopj/android-smart-image-view
3. TouchImageView Adds touch functionality to Android ImageView.
   https://github.com/MikeOrtiz/TouchImageView
4. CircleImageView A fast circular ImageView perfect for profile images.
   https://github.com/hdodenhof/CircleImageView
5. gesture-imageview This is a simple Android View class which provides basic pinch and zoom capability for images.
   https://github.com/jasonpolites/gesture-imageview
6. android-shape-imageview Custom shaped android imageview components
   https://github.com/siyamed/android-shape-imageview
7. AndroidImageCrop How select and crop image on Android
   https://github.com/lorensiuswlt/AndroidImageCrop
8. GifImageView Android ImageView that handles animated GIF images
   https://github.com/felipecsl/GifImageView
9. cropper Android widget for cropping and rotating an image.
   https://github.com/edmodo/cropper
10. ImageViewZoom Android ImageView widget with zoom and pan capabilities
    https://github.com/sephiroth74/ImageViewZoom
11. CircularImageView Custom view for circular images in Android while maintaining the best draw performance
    https://github.com/Pkmmte/CircularImageView
12. CircularImageView Create circular image view in android
    https://github.com/lopspower/CircularImageView
13. android-crop Android library project for cropping images
    https://github.com/jdamcd/android-crop
14. cropimage Replacement for deprecated official Android crop image function
    https://github.com/biokys/cropimage
15. android-cropimageCropImage Activity from Gallery.apk packaged as a reusable Android library (4.0 and up).
    https://github.com/lvillani/android-cropimage
16. android-gpuimage Android filters based on OpenGL (idea from GPUImage for iOS)
    https://github.com/CyberAgent/android-gpuimage
17. gif-movie-view Android View widget for displaying GIF animations. https://github.com/sbakhtiarov/gif-movie-view
18. WaveDrawable Drawable animation inspired by Tinder.
    https://github.com/Alexrs95/WaveDrawable
19. DrawerArrowDrawable Visual back-port of the rotating drawer-to-arrow drawable from Android L
    https://github.com/ChrisRenke/DrawerArrowDrawable
20. TextDrawable This light-weight library provides images with letter/text like the Gmail app. It extends the Drawable class thus can be used with existing/custom/network ImageView classes. Also included is a fluent interface for creating drawables and a customizable ColorGenerator.
    https://github.com/amulyakhare/TextDrawable
21. SelectableRoundedImageView Android ImageView that supports different radiuses on each corner. It also supports oval(and circle) shape and border. This would be especially useful for using inside CardView which should be rounded only top left and top right corners(Don't forget to call setPreventCornerOverlap(false) on your cardview).
    https://github.com/pungrue26/SelectableRoundedImageView
22. avatar-android Rounded and Squared Avatar for Android Applications
    https://github.com/Pedroafa/avatar-android
23. ByakuGallery ByakuGallery is an open source Android library that allows the visualization of large images with gesture capabilities. This lib is based on AOSP Camera2.
    https://github.com/diegocarloslima/ByakuGallery

####</ Button

1. circular-progress-button Android Circular Progress Button
   https://github.com/dmytrodanylyk/circular-progress-button
2. android-process-button Android Buttons With Built-in Progress Meters.
   https://github.com/dmytrodanylyk/android-process-button
3. android-circlebutton Circle button widget for Android
   https://github.com/markushi/android-circlebutton
4. android-flat-button FButton - a flat button library for Android
   https://github.com/hoang8f/android-flat-button
5. FloatingActionButton Android Google+ like floating action button
   https://github.com/makovkastar/FloatingActionButton
6. ExpandableButtonMenu An Android library for an expandable button menu
   https://github.com/lemonlabs/ExpandableButtonMenu
7. fancybuttons An Android library to easily create fancy buttons without the need of drawable files.
   https://github.com/medyo/fancybuttons
8. Android-Bootstrap Bootstrap style buttons with Font Awesome
   https://github.com/Bearded-Hen/Android-Bootstrap
9. SwitchButton SwitchButton
   https://github.com/kyleduo/SwitchButton
10. ToggleButton ToggleButton Widget For Android Dev
    https://github.com/zcweng/ToggleButton

####</ Progressbar/Progress View

1. SmoothProgressBar A small Android library allowing you to have a smooth and customizable horizontal indeterminate ProgressBar
   https://github.com/castorflex/SmoothProgressBar
2. NumberProgressBar A beautiful, slim Android ProgressBar.
   https://github.com/daimajia/NumberProgressBar
3. android-HoloCircularProgressBar Holo Circular ProgressBar
   https://github.com/passsy/android-HoloCircularProgressBar
4. android-square-progressbar An android library to display a progressbar that goes around an image.
   https://github.com/mrwonderman/android-square-progressbar
5. ProgressPieView Android library for showing progress in a highly customizable pie.
   https://github.com/FilipPudak/ProgressPieView
6. GoogleProgressBar Android library to display progress like google does in some of his services.
   https://github.com/jpardogo/GoogleProgressBar
7. ProgressWheel A progress wheel for android, intended for use instead of the standard progress bar.
   https://github.com/Todd-Davies/ProgressWheel
8. RefreshActionItem Android - An action bar item which acts both as a refresh button and as a progress indicator
   https://github.com/ManuelPeinado/RefreshActionItem
9. CircleProgress CircleProgress, DonutProgress, ArcProgress
   https://github.com/lzyzsd/CircleProgress
10. WaveView A wave view of android,can be used as progress bar.
    https://github.com/john990/WaveView
11. water-wave-progress 水波按进度上升，带环形进度条
    https://github.com/Modificator/water-wave-progress
12. InfiniteIndicator This lib can be used for viewpager infinite loop with indicator easily.
    https://github.com/lightSky/InfiniteIndicator
13. Android-RoundCornerProgressBar Round Corner Progress Bar Library for Android
    https://github.com/akexorcist/Android-RoundCornerProgressBar

####</ Menu

1. SlidingMenu SlidingMenu is an Open Source Android library that allows developers to easily create applications with sliding menus like those made popular in the Google+, YouTube, and Facebook apps. Feel free to use it all you want in your Android apps provided that you cite this project and include the license in your app.
   https://github.com/jfeinstein10/SlidingMenu
2. android-menudrawer A slide-out menu implementation, which allows users to navigate between views in your app.
   https://github.com/SimonVT/android-menudrawer
3. ArcMenu An android custom view which looks like the menu in Path 2.0 (for iOS).
   https://github.com/daCapricorn/ArcMenu
4. RibbonMenu Navigation menu for Android (based off Google+ app)
   https://github.com/darvds/RibbonMenu
5. CircularFloatingActionMenu an animated circular menu for Android
   https://github.com/oguzbilgener/CircularFloatingActionMenu
6. ActionsContentView ActionsContentView is an standalone library implements actions/content swiping view (AKA Side Navigation UI Pattern, AKA Facebook side menu). The library doesn't use any specific code introduced in new Android SDK versions. This allows develop an application with an action/content swiping view for every version of Android from 2.2 and up. https://github.com/StevenRudenko/ActionsContentView
7. Android-NewPopupMenu Android-NewPopupMenu is an android library to create popup menu with GoogleMusic app-like style.
   https://github.com/u1aryz/Android-NewPopupMenu
8. android-floating-action-menu Floating Action Menu for Android. Inspired by the Google Plus floating menu.
   https://github.com/sephiroth74/android-floating-action-menu
9. Android-CircleMenu Menu with items on a rotating circle
   https://github.com/szugyi/Android-CircleMenu
10. Android Wheel Menu Simple and easy to use circular menu widget for Android.
    https://github.com/anupcowkur/Android-Wheel-Menu
11. android-satellite-menu Android Satellite Menu
    https://github.com/siyamed/android-satellite-menu
12. SideNavigation Implementation of "SIde Navigation" or "Fly-in app menu" pattern for Android (based on Google+ app)
    https://github.com/johnkil/SideNavigation
13. AndroidResideMenu The idea of ResideMenu is from Dribbble 1 and 2. It has come true and run in iOS devices. iOS ResideMenu This project is the RefsideMenu Android version. The visual effect is partly referred to iOS version of ResideMenu. And thanks to the authors for the above idea and contribution.
    https://github.com/SpecialCyCi/AndroidResideMenu
14. GoogleNavigationDrawerMenu Android Library for a DrawerLayout similar to the one in Google Apps
    https://github.com/Arasthel/GoogleNavigationDrawerMenu
15. simple-side-drawer Simple library which enable you to add a drawer(slide-out) navigation to your android application
    https://github.com/adamrocker/simple-side-drawer
16. BlurNavigationDrawer Android - Blur Navigation Drawer like Etsy app.
    https://github.com/charbgr/BlurNavigationDrawer
17. ActionSheetForAndroid IOS UIActionSheet in Android
    https://github.com/baoyongzhang/ActionSheetForAndroid
18. BottomSheet One way to present a set of actions to a user is with bottom sheets, a sheet of paper that slides up from the bottom edge of the screen. Bottom sheets offer flexibility in the display of clear and simple actions that do not need explanation.
    https://github.com/soarcn/BottomSheet
19. Context-Menu.Android Context-Menu.Android
    https://github.com/Yalantis/Context-Menu.Android
20. Side-Menu.Android Side-Menu.Android
    https://github.com/Yalantis/Side-Menu.Android
21. Android-CircleMenu 自定义ViewGroup实现的圆形旋转菜单，支持跟随手指旋转以及快速旋转。 图标请勿商用。 https://github.com/hongyangAndroid/Android-CircleMenu
22. AndroidPullMenu An Android Library that allows users to pull down a menu and select different actions. It can be implemented inside ScrollView, GridView, ListView.
    https://github.com/ShkurtiA/AndroidPullMenu

####</ Dialog

1. QustomDialog a quick custom android dialog project
   https://github.com/danoz73/QustomDialog
2. Android-RateThisApp Android library to show "Rate this app" dialog
   https://github.com/kskkbys/Android-RateThisApp
3. AndroidSliderPreference Android library that allows applications to add dialog-based slider widgets to their settings
   https://github.com/jayschwa/AndroidSliderPreference
4. L-Dialogs A small library replicating the new dialogs in android L.
   https://github.com/lewisjdeane/L-Dialogs
5. LicensesDialog LicensesDialog is an open source library to display licenses of third-party libraries in an Android app.
   https://github.com/PSDev/LicensesDialog
6. android-styled-dialogs A simple library for styling Android dialogs in the Holo theme. It also removes boilerplate code for displaying simple dialogs.
   https://github.com/inmite/android-styled-dialogs
7. PostOffice This is a library for easily constructing Holo and Material Design Dialogs.
   https://github.com/r0adkll/PostOffice
8. sweet-alert-dialog Android版的SweetAlert，清新文艺，快意灵动的甜心弹框
   https://github.com/pedant/sweet-alert-dialog
9. BlurDialogFragment Library project to display DialogFragment with a blur effect.
   https://github.com/tvbarthel/BlurDialogFragment

####</ ListView/ScrollView

1. pinned-section-listview Easy to use ListView with pinned sections for Android.
   https://github.com/beworker/pinned-section-listview
2. PullToRefresh-ListView A generic, customizable, open source Android ListView implementation that has 'Pull to Refresh' functionality.
   https://github.com/erikwt/PullToRefresh-ListView
3. FlabbyListView Android library to display a ListView whose cells are not rigid but flabby and react to ListView scroll.
   https://github.com/jpardogo/FlabbyListView
4. XListView-Android ListView supports pull refresh and pull up to load more feature.
   https://github.com/Maxwin-z/XListView-Android
5. PinterestListView Pinterest style ListView for Android
   https://github.com/vladexologija/PinterestListView
6. android-pulltorefresh-and-loadmore android custom listview,with interaction pattern load more and pull to refresh to load data dinamically
   https://github.com/shontauro/android-pulltorefresh-and-loadmore
7. PinnedHeaderListView A ListView with pinned section headers for Android
   https://github.com/JimiSmith/PinnedHeaderListView
8. ParallaxScroll Parallax ScrollView and ListView for Android
   https://github.com/nirhart/ParallaxScroll
9. Android-HorizontalListView HorizontalListView is an Android ListView widget which scrolls in a horizontal manner (in contrast with the SDK-provided ListView which scrolls vertically).
   https://github.com/MeetMe/Android-HorizontalListView
10. LinearListView Android library that allows you to bind a LinearLayout with a ListAdapter.
    https://github.com/frankiesardo/LinearListView
11. ParallaxListView A Android ListView Demo with a parallax effect header like Path.
    https://github.com/Gnod/ParallaxListView
12. PagedHeadListView Android boosted ListView supporting paginated header with a new material page indicator.
    https://github.com/JorgeCastilloPrz/PagedHeadListView
13. PullZoomView An Android custom ListView and ScrollView with pull to zoom-in.
    https://github.com/Frank-Zhu/PullZoomView
14. HeaderListView Android ListView with sticky headers
    https://github.com/applidium/HeaderListView
15. ListviewFilter Awesome Listview filter functionality in Android.
    https://github.com/bhavyahmehta/ListviewFilter
16. android-accordion-view Simple ListView based Android AccordionView
    https://github.com/hamsterready/android-accordion-view
17. DragNDropList An easy to use Drag & Drop List for Android. Direct replacement of the android ListView.
    https://github.com/terlici/DragNDropList
18. QuickReturn Android ListView that implements the QuickReturn UI pattern. Written from scratch with focus on performance.
    https://github.com/felipecsl/QuickReturn
19. Android-HorizontalListView HorizontalListView is an Android ListView widget which scrolls in a horizontal manner
    https://github.com/MeetMe/Android-HorizontalListView
20. ZrcListView 一个顺滑又漂亮的Android下拉刷新与加载更多列表组件。
    https://github.com/zarics/ZrcListView
21. android-swipelistview An Android List View implementation with support for drawable cells and many other swipe related features
    https://github.com/47deg/android-swipelistview
22. android-pulltorefresh This project aims to provide a reusable pull to refresh widget for Android.
    https://github.com/johannilsson/android-pulltorefresh
23. StickyListHeaders An android library for section headers that stick to the top
    https://github.com/emilsjolander/StickyListHeaders
24. LazyList Lazy load of images in Android
    https://github.com/thest1/LazyList
25. FloatingGroupExpandableListView An open source Android library that provides a floating group view at the top of the ExpandableListView
    https://github.com/diegocarloslima/FloatingGroupExpandableListView
26. PullSeparateListView 到顶部或底部时拉动，item分离效果
    https://github.com/chiemy/PullSeparateListView
27. Android-SlideExpandableListView A better ExpandableListView, with animated expandable views for each list item
    https://github.com/tjerkw/Android-SlideExpandableListView
28. HorizontalVariableListView Horizontal list view for Android which allows variable items widths
    https://github.com/sephiroth74/HorizontalVariableListView
29. ListBuddies Android library to achieve in an easy way, the behaviour of the home page in the Expedia app, with a pair of auto-scroll circular parallax ListViews.
    https://github.com/jpardogo/ListBuddies
30. Android-Tiling-ScrollView A tiling scrollview to display large picture (similar to iOS "CATiledLayer")
    https://github.com/ened/Android-Tiling-ScrollView
31. PullScrollView 1.仿照新浪微博Android客户端个人中心的ScrollView，下拉背景伸缩回弹效果。 2.ScrollView仿IOS回弹效果。
    https://github.com/MarkMjw/PullScrollView
32. StickyScrollViewItems A small android library for tagging views inside a ScrollView as "sticky" making them stick to the top of the scroll container until a new sticky view comes and takes it's place
    https://github.com/emilsjolander/StickyScrollViewItems
33. Discrollview Scroll + discover = DiscrollView
    https://github.com/flavienlaurent/discrollview
34. SwipeMenuListView SwipeMenuListView
    https://github.com/baoyongzhang/SwipeMenuListView
35. Android-ObservableScrollView Android library to observe scroll events on scrollable views.
    https://github.com/ksoichiro/Android-ObservableScrollView
36. Pull-to-Refresh.Rentals-Android This project aims to provide a simple and customizable pull to refresh implementation. Made in Yalantis
    https://github.com/Yalantis/Pull-to-Refresh.Rentals-Android
37. StikkyHeader This is a very simple library for Android that allows you to stick an header to a scrollable view and easly apply animation to it
    https://github.com/carlonzo/StikkyHeader
38. quickscroll Bringing extended scrolling features to Android's native ListView and ExpandableListView.
    https://github.com/andraskindler/quickscroll

####</ GridView

1. two-way-gridview An Android GridView that can be configured to scroll horizontally or vertically
   https://github.com/jess-anders/two-way-gridview
2. AsymmetricGridView Android ListView that mimics a GridView with asymmetric items. Supports items with row span and column span
   https://github.com/felipecsl/AsymmetricGridView
3. AndroidCoolDragAndDropGridView An example of a gridview with various column span items and drag and drop support like Google keep has
   https://github.com/theredsunrise/AndroidCoolDragAndDropGridView
4. GridViewHeader Android GridView with addHeader( View view ) function
   https://github.com/munix/GridViewHeader
5. DynamicGrid Drag and drop GridView for Android
   https://github.com/askerov/DynamicGrid
6. PagingGridView A Paging GridView with the same behavior as PagingListView.
   https://github.com/nicolasjafelle/PagingGridView
7. DraggableGridView A drag-and-drop scrolling grid view for Android
   https://github.com/thquinn/DraggableGridView
8. AndroidStaggeredGrid An Android staggered grid view which supports multiple columns with rows of varying sizes.
   https://github.com/etsy/AndroidStaggeredGrid
9. StaggeredGridView A modified version of Android's experimental StaggeredGridView. Includes own OnItemClickListener and OnItemLongClickListener, selector, and fixed position restore.
   https://github.com/maurycyw/StaggeredGridView
10. android-GridViewWithHeaderAndFooter GridView with Header and Footer
    https://github.com/liaohuqiu/android-GridViewWithHeaderAndFooter
11. DynamicGrid Drag and drop GridView for Android
    https://github.com/askerov/DynamicGrid

####</ RatingView

1. SimpleRatingView A rating toggle for Android which switches between 3 rating levels: positive, neutral, and negative.
   https://github.com/xiprox/SimpleRatingView

####</ Recyclerview

1. recyclerview-animators An Android library which easily add itemanimator to RecyclerView items.
   https://github.com/wasabeef/recyclerview-animators
2. SuperRecyclerView Pumped up RecyclerView
   https://github.com/Malinskiy/SuperRecyclerView
3. DynamicRecyclerView Set of plugable extenstions for Android RecyclerView
   https://github.com/ismoli/DynamicRecyclerView

####</ ViewPager

1. Android-ViewPagerIndicator Paging indicator widgets compatible with the ViewPager from the Android Support Library and ActionBarSherlock. Originally based on Patrik Åkerfeldt's ViewFlow.
   https://github.com/JakeWharton/Android-ViewPagerIndicator
2. ViewPagerExtensions A set of custom views for the ViewPager from the Android Support Package
   https://github.com/astuetz/ViewPagerExtensions
3. parallaxviewpager An easy-to-use ViewPager subclass with parallax background effect for Android apps.
   https://github.com/andraskindler/parallaxviewpager
4. android-auto-scroll-view-pager Android auto scroll viewpager or viewpager in viewpager
   https://github.com/Trinea/android-auto-scroll-view-pager
5. NumericPageIndicator Android - A ViewPager page indicator that displays the current page number and (optionally) the page count
   https://github.com/ManuelPeinado/NumericPageIndicator
6. VerticalViewPager Vertical implementation of Android ViewPager
   https://github.com/LambergaR/VerticalViewPager
7. InfiniteViewPager Augment Android's ViewPager with wrap-around functionality.
   https://github.com/antonyt/InfiniteViewPager
8. ViewPager3D Extension of Android ViewPager with a 3D swipe effect
   https://github.com/inovex/ViewPager3D
9. LoopingViewPager An android ViewPager extension allowing infinite scrolling
   https://github.com/imbryk/LoopingViewPager

####</ ActionBar

1. ActionBarSherlock Action bar implementation which uses the native action bar on Android 4.0+ and a custom implementation on pre-4.0 through a single API and theme.
   https://github.com/JakeWharton/ActionBarSherlock
2. TabBarView An Android Library to help you create actionbar tabs like "Capitaine train" app by Cyril Mottier
   https://github.com/Mirkoddd/TabBarView
3. android-extendedactionbar An example of how to extend the ActionBar under the status bar from the theme
   https://github.com/Takhion/android-extendedactionbar
4. FadingActionBar Android library implementing a fading effect for the action bar, similar to the one found in the Play Music app
   https://github.com/ManuelPeinado/FadingActionBar
5. GlassActionBar Android - a library that adds a glass-like effect to the action bar.
   https://github.com/ManuelPeinado/GlassActionBar

####</ Fragment

1. Android-CircularRevealFragment A demo about how to show and hide fragments using the new Android Lollipop circle reveal transitions. Minimum API level is 21
   https://github.com/ferdy182/Android-CircularRevealFragment

####</ Tabs

####</ Toast

1. Crouton Context sensitive notifications for Android
   https://github.com/keyboardsurfer/Crouton
2. SuperToasts A library that extends the Android toast framework.
   https://github.com/JohnPersano/SuperToasts
3. Android-AppMsg In-layout notifications. Based on Toast notifications and article by Cyril Mottier
   https://github.com/johnkil/Android-AppMsg
4. MessageBar An Android Toast replacement, similar to the one seen in the GMail app.
   https://github.com/SimonVT/MessageBar
5. SnackBar toast-like alert pattern for Android
   https://github.com/MrEngineer13/SnackBar

####</ SeekBar

1. HoloCircleSeekBar A Circle SeekBar inspired by Android Holo ColorPicker designed by Marie Schweiz and developed by Lars Werkman.
   https://github.com/JesusM/HoloCircleSeekBar
2. AndroidCircularSeekBar A circular seek bar for Android
   https://github.com/RaghavSood/AndroidCircularSeekBar
3. circularseekbar Custom circular SeekBar (Circle, Semi-circle, and Ellipse) View/Widget for Android
   https://github.com/devadvance/circularseekbar
4. StartPointSeekBar StartPointSeekBar is a custom view for the Android platform that makes it possible to have a SeekBar to have custom start point.
   https://github.com/vashisthg/StartPointSeekBar
5. SeekArc Circular SeekBar view for Android
   https://github.com/TriggerTrap/SeekArc
6. discreteSeekBar DiscreteSeekbar is my poor attempt to develop an android implementation of the Discrete Slider component from the Google Material Design Guidelines.
   https://github.com/AnderWeb/discreteSeekBar
7. discreteSeekBar DiscreteSeekbar is my poor attempt to develop an android implementation of the Discrete Slider component from the Google Material Design Guidelines.
   https://github.com/AnderWeb/discreteSeekBar
8. android-comboseekbar seekbar with distinct values
   https://github.com/karabaralex/android-comboseekbar
9. RangeSeekbar A seekbar contains two cursor(left and right). Multiple touch supported.
   https://github.com/dolphinwang/RangeSeekbar

####</ Calendar View

1. Caldroid Caldroid is a fragment that display calendar with dates in a month. Caldroid can be used as embedded fragment, or as dialog fragment. User can also swipe left/right to navigate to different months.
   https://github.com/roomorama/Caldroid
2. android-times-square Standalone Android widget for picking a single date from a calendar view.
   https://github.com/square/android-times-square
3. calendar-widget The Android calendar widget is home screen widget for your Android device. It displays a list of upcoming calendar events so that you can easily have a glimpse at your upcoming appointments.
   https://github.com/plusonelabs/calendar-widget
4. android-spinnerwheel Wheel-like spinner widget for Android
   https://github.com/ai212983/android-spinnerwheel
5. Android-MonthCalendarWidget A simple example of a responsive Month Calendar app widget for Android
   https://github.com/romannurik/Android-MonthCalendarWidget
6. android-betterpickers Android library for better Picker DialogFragments
   https://github.com/derekbrameyer/android-betterpickers
7. android-calendar-card Android calendar view (like card)
   https://github.com/kenumir/android-calendar-card
8. DateSlider An alternative DatePicker for Android
   https://github.com/bendemboski/DateSlider
9. Android-Week-View Android Week View is an android library to display calendars (week view or day view) within the app. It supports custom styling.
   https://github.com/alamkanak/Android-Week-View

####</ Layout

1. FoldableLayout Android widgets to implement folding animation
   https://github.com/alexvasilkov/FoldableLayout
2. ScalableLayout Scalable Layout For Android
   https://github.com/ssomai/ScalableLayout
3. FlipLayout Android Flip 3D Animation like web Google+
   https://github.com/stormzhang/FlipLayout
4. FlowLayout Android implementation of FlowLayout. Layout arranges its children in multiple rows depending on their width.
   https://github.com/blazsolar/FlowLayout
5. CircleLayout Circular layout for android
   https://github.com/dmitry-zaitsev/CircleLayout
6. ResideLayout An Android Layout which has a same function like https://github.com/romaonthego/RESideMenu
   https://github.com/kyze8439690/ResideLayout
7. GooglePlusLayout GoolgePlusLayout is a custom layout that plays animation on the children views while scrolling as the layout in the Google Plus (android) main page
   https://github.com/Nammari/GooglePlusLayout
8. android-empty-layout A library for showing different types of layouts when a list view is empty
   https://github.com/alamkanak/android-empty-layout
9. ImageLayout Android - A layout that arranges its children in relation to a background image
   https://github.com/ManuelPeinado/ImageLayout
10. android-flowlayout Linear layout, that wrap its content to the next line if there is no space in the current line.
    https://github.com/ApmeM/android-flowlayout
11. AndroidSwipeLayout The Most Powerful Swipe Layout!
    https://github.com/daimajia/AndroidSwipeLayout
12. FreeFlow A layout engine for Android that decouples layouts from the View containers that manage scrolling and view recycling. FreeFlow makes it really easy to create custom layouts and beautiful transition animations as data and layouts change
    https://github.com/Comcast/FreeFlow
13. SwipeableLayout A swipeable - auto resizing view group for android
    https://github.com/wmbest2/SwipeableLayout
14. SwipeBackLayout An Android library that help you to build app with swipe back gesture.
    https://github.com/Issacw0ng/SwipeBackLayout
15. android_maskable_layout A library that easily allows you to mask layouts/viewgroups
    https://github.com/christophesmet/android_maskable_layout
16. android-gridlayout A backwards compatible implementation of GridLayout for Android
    https://github.com/dlew/android-gridlayout
17. DragLayout An Android Project
    https://github.com/BlueMor/DragLayout
18. ExpandableLayout Implementation of ExpandableListview with custom header and custom content.
    https://github.com/traex/ExpandableLayout
19. android-PullRefreshLayout This component like SwipeRefreshLayout, it is more beautiful than SwipeRefreshLayout.
    https://github.com/baoyongzhang/android-PullRefreshLayout
20. DragTopLayout Drag down to show a view on the top.
    https://github.com/chenupt/DragTopLayout

####</ Other

1. Swipecards A Tinder-like Android library to create the swipe cards effect. You can swipe left or right to like or dislike the content.
   https://github.com/Diolor/Swipecards
2. Android SlideShow Widget A set of widgets to create smooth slide shows with ease.
   https://github.com/marvinlabs/android-slideshow-widget
3. AndroidWheel Custom wheel widget for android
   https://github.com/sephiroth74/AndroidWheel
4. range-bar Android widget for selecting a range of values.
   https://github.com/edmodo/range-bar
5. TileView The TileView widget is a subclass of ViewGroup that provides a mechanism to asynchronously display tile-based images, with additional functionality for 2D dragging, flinging, pinch or double-tap to zoom, adding overlaying Views (markers), built-in Hot Spot support, dynamic path drawing, multiple levels of detail, and support for any relative positioning or coordinate system.
   https://github.com/moagrius/TileView
6. android-switch-backport A backport of the Switch widget (http://developer.android.com/reference/android/widget/Switch.html) that was introduced on Android 4. This port works on Android 2.1+.
   https://github.com/BoD/android-switch-backport
7. android-bootstrap A template/bootstrap/boilerplate application that includes tons of great open source tools and frameworks.
   https://github.com/AndroidBootstrap/android-bootstrap
8. cardslib Android Library to build a UI Card
   https://github.com/gabrielemariotti/cardslib
9. AndroidSlidingUpPanel Android Sliding Up Panel Demo
   https://github.com/umano/AndroidSlidingUpPanel
10. android-viewflow A horizontal view scroller library for Android
    https://github.com/pakerfeldt/android-viewflow
11. android-viewbadger A simple way to "badge" any given Android view at runtime without having to cater for it in layout
    https://github.com/jgilfelt/android-viewbadger
12. DraggablePanel Android library used to create an awesome Android UI based on a draggable element similar to the last YouTube graphic component.
    https://github.com/pedrovgs/DraggablePanel
13. android-stackblur Android StackBlur is a library that can perform a blurry effect on a Bitmap based on a gradient or radius, and return the result. The library is based on the code of Mario Klingemann.
    https://github.com/kikoso/android-stackblur
14. StickyGridHeaders An Android Library that makes it easy to make grid views with sectioned data and headers that stick to the top.
    https://github.com/TonicArtos/StickyGridHeaders
15. AndroidViewHover An elegant way to show your menu or messages.
    https://github.com/daimajia/AndroidViewHover
16. SystemBarTint Apply background tinting to the Android system UI when using KitKat translucent modes
    https://github.com/jgilfelt/SystemBarTint
17. chromeview Android WebView implementation that uses the latest Chromium code
    https://github.com/pwnall/chromeview
18. android-iconify Integration of FontAwesome for Android
    https://github.com/JoanZapata/android-iconify
19. StandOut StandOut lets you easily create floating windows in your Android app.
    https://github.com/pingpongboss/StandOut
20. android-sliding-layer-lib This repository host a library that provides an easy way to include an autonomous layer/view that slides from the side of your screen and which is fully gesture ready, the same way as our detail view in Wunderlist 2 does. This pattern can also be seen in Google+’s notification center or in Basecamp’s detail view.
    https://github.com/6wunderkinder/android-sliding-layer-lib
21. Android-SwipeToDismiss Android swipe-to-dismiss mini-library and sample code
    https://github.com/romannurik/Android-SwipeToDismiss
22. HoloColorPicker An Android Holo themed colorpicker designed by Marie Schweiz
    https://github.com/LarsWerkman/HoloColorPicker
23. UnifiedPreference UnifiedPreference is a library for working with all versions of the Android Preference package from API v4 and up.
    https://github.com/saik0/UnifiedPreference
24. aFileChooser Android library that provides a file explorer to let users select files on external storage.
    https://github.com/iPaulPro/aFileChooser
25. NewQuickAction Android QuickAction
    https://github.com/lorensiuswlt/NewQuickAction
26. android-uitableview Library and example project on how to use the UITableView component
    https://github.com/thiagolocatelli/android-uitableview
27. Android-ProgressFragment Implementation of the fragment with the ability to display indeterminate progress indicator when you are waiting for the initial data.
    https://github.com/johnkil/Android-ProgressFragment
28. android-pdfview A fast PDF reader component for Android development
    https://github.com/JoanZapata/android-pdfview
29. Android-Pdf-Viewer-Library Pdf Viewer library for Android
    https://github.com/jblough/Android-Pdf-Viewer-Library
30. QuiltViewLibrary Android Quilt View Library
    https://github.com/jacobmoncur/QuiltViewLibrary
31. Android-UndoBar An implementation of Android's Undo Bar as seen in Google's Gmail app.
    https://github.com/jenzz/Android-UndoBar
32. Android-ScrollBarPanel Android-ScrollBarPanel allows to attach a View to a scroll indicator like it's done in Path 2.0
    https://github.com/rno/Android-ScrollBarPanel
33. ScrollBarPanelWithClock Path like scrollbar panel with clock.
    https://github.com/learnNcode/ScrollBarPanelWithClock
34. changeloglib Android Library to display your changelog
    https://github.com/gabrielemariotti/changeloglib
35. android-FlipView A small, easy to use android library for implementing flipping between views as seen in the popular Flipboard application
    https://github.com/emilsjolander/android-FlipView
36. discreet-app-rate A lightweight non intrusive app rate reminder for Android
    https://github.com/PomepuyN/discreet-app-rate
37. KenBurnsView Android ImageViews animated by Ken Burns Effect
    https://github.com/flavioarfaria/KenBurnsView
38. UndoBar The UI component for Android advanced UI pattern undo-bar, used in Gmail app, create by roman nurik
    https://github.com/soarcn/UndoBar
39. FancyCoverFlow A cool Open Source CoverFlow view for Android with several fancy effects.
    https://github.com/davidschreiber/FancyCoverFlow
40. AppRater AppRater Library for Android
    https://github.com/codechimp-org/AppRater
41. Android-ActionItemBadge This library offers a simple method to add a small badge icon to your ActionBar-MenuItem
    https://github.com/mikepenz/Android-ActionItemBadge
42. poppyview Android library implementing a poppy view on scroll, similar to the one found in the Google Plus app
    https://github.com/flavienlaurent/poppyview
43. android-segmented-control ios7 UISegmentedControl for android
    https://github.com/hoang8f/android-segmented-control
44. IconicDroid IconicDroid is a custom Android Drawable which allows to draw icons from several iconic fonts.
    https://github.com/atermenji/IconicDroid
45. ParallaxPager Add some depth to your Android scrolling.
    https://github.com/prolificinteractive/ParallaxPager
46. AndroidPinning A standalone library project for certificate pinning on Android.
    https://github.com/moxie0/AndroidPinning
47. WizardPager Wizard Pager is a library that provides an example implementation of a Wizard UI on Android, it's based of Roman Nurik's wizard pager
    https://github.com/TechFreak/WizardPager
48. android-visualizer Takes the input from the Android MediaPlayer and displays visualizations, like in iTunes or WinAmp
    https://github.com/felixpalmer/android-visualizer
49. ExpandablePanel Android library for creating an expandable to full screen view inside a viewgroup composition.
    https://github.com/JorgeCastilloPrz/ExpandablePanel
50. NiftyNotification effects for android notifications.base on (Crouton)
    https://github.com/sd6352051/NiftyNotification
51. GlowPadBackport A backport of the Android 4.2 GlowPadView that works on the SDK on API levels 4+
    https://github.com/frakbot/GlowPadBackport
52. CustomLoading custom loading for android
    https://github.com/stormzhang/CustomLoading
53. chromium_webview Android WebView wrapper based on chromium
    https://github.com/mogoweb/chromium_webview
54. MagicViews Set custom font in Android application
    https://github.com/ikocijan/MagicViews
55. TableFixHeaders Android library that implements a table with fixed headers.
    https://github.com/InQBarna/TableFixHeaders
56. FloatingNotification Floating Notification for Android app - Facebook ChatHeads Notification system
    https://github.com/marshallino16/FloatingNotification
57. android-slideshow-widget A set of widgets to create smooth slideshows with ease.
    https://github.com/marvinlabs/android-slideshow-widget
58. HanselAndGretel Android library providing bread crumbs to the support library fragments.
    https://github.com/JakeWharton/HanselAndGretel
59. ChromaHashView A classic password visualization concept, ported to Android
    https://github.com/MichaelEvans/ChromaHashView
60. Android-DirectoryChooser A directory chooser library for Android.
    https://github.com/passy/Android-DirectoryChooser
61. WheelView An Android Widget for selecting items that rotate on a wheel.
    https://github.com/LukeDeighton/WheelView
62. RippleView View that imitates Ripple Effect on click which was introduced in Android L (for Android 2.3+)
    https://github.com/siriscac/RippleView
63. GaugeView An Android library for drawing gauges on Canvas.
    https://github.com/CodeAndMagic/GaugeView
64. ATableView Create iOS-like tables (UITableView) for Android, using UIKit object model.
    https://github.com/dmacosta/ATableView
65. Android-RecurrencePicker Google Calendar Recurrence picker
    https://github.com/Shusshu/Android-RecurrencePicker
66. ActionSheetForAndroid IOS UIActionSheet in Android
    https://github.com/baoyongzhang/ActionSheetForAndroid
67. ckChangeLog ckChangeLog - An Android Library to display a Change Log
    https://github.com/cketti/ckChangeLog
68. android-floatinglabel-widgets Floating label input widgets
    https://github.com/marvinlabs/android-floatinglabel-widgets
69. MarkdownView MarkdownView is an Android webview with the capablity of loading Markdown text or file and display it as HTML, it uses MarkdownJ and extends Android webview.
    https://github.com/falnatsheh/MarkdownView
70. NoNonsense-FilePicker A file/directory-picker for android. Implemented as a library project.
    https://github.com/spacecowboy/NoNonsense-FilePicker
71. PopoverView A Popover Controller for Android Tablets. It's an easy solution to simulate an iOS UIPopoverController
    https://github.com/lupidan/PopoverView
72. slideuppane A pane that slide up from the bottom of an android view
    https://github.com/briangriffey/slideuppane
73. SwipeBack SwipeBack for Android Activities to do pretty the same as the android "back-button" will do, but in a really intuitive way by using a swipe gesture
    https://github.com/sockeqwe/SwipeBack
74. ShowTipsView Highligth specific points of interest of your app
    https://github.com/fredericojssilva/ShowTipsView
75. FancyCoverFlow A cool Open Source CoverFlow view for Android with several fancy effects.
    https://github.com/davidschreiber/FancyCoverFlow
76. WheelView Android滚动选择控件
    https://github.com/wangjiegulu/WheelView
77. CurtainView An android view,which can layer on any gravity for swiping.
    https://github.com/aicaprio/CurtainView
78. android-pathview Android view with both path from constructed path or from svg.
    https://github.com/geftimov/android-pathview
79. DrawableView A view that allows to paint and saves the result as a bitmap
    https://github.com/PaNaVTEC/DrawableView

###</ Template

1. android-material-drawer-template An Android template with navigation drawer for material design
   https://github.com/kanytu/android-material-drawer-template
2. material-design-icons-adt-template Android Studio / Eclipse ADT template for material-design-icons resources
   https://github.com/intrications/material-design-icons-adt-template

###</ Adapter

1. MultiChoiceAdapter Android - A ListView adapter with support for multiple choice modal selection
   https://github.com/ManuelPeinado/MultiChoiceAdapter
2. easy-adapter Easy Adapters library for Android
   https://github.com/ribot/easy-adapter
3. Renderers Renderers is an Android library that avoids all the boilerplate needed to create a new ListView adapter.
   https://github.com/pedrovgs/Renderers
4. FunDapter Simplify Adapter creation for your Android ListViews.
   https://github.com/amigold/FunDapter
5. instant-adapter Just like instant coffee, saves 78% of your time on Android's Custom Adapters.
   https://github.com/ragunathjawahar/instant-adapter
6. adapter-kit Adapter Kit is a set of useful adapters for Android.
   https://github.com/mobsandgeeks/adapter-kit
7. EfficientAdapter An efficient adapter to make the use of RecyclerView much easier for Android.
   https://github.com/StanKocken/EfficientAdapter
8. EasyListViewAdapters This library provides Easy Android ListView Adapters(EasyListAdapter & EasyCursorAdapter) which makes designing Multi-Row-Type ListView very simple & cleaner, It also provides many useful features for ListView.
   https://github.com/birajpatel/EasyListViewAdapters
9. GridListViewAdapters This library provides GridAdapters(ListGridAdapter & CursorGridAdapter) which enable you to bind your data in grid card fashion within android.widget.ListView, Also provides many other features related to GridListView.
   https://github.com/birajpatel/GridListViewAdapters

###</ Validation

1. android-saripaar UI Validation Library for Android
   https://github.com/ragunathjawahar/android-saripaar

###</ Gesture

1. android-gesture-detectors Gesture detector framework for multitouch handling on Android, based on Android's ScaleGestureDetector
   https://github.com/Almeros/android-gesture-detectors

###</ Game Engine

1. cocos2d-x cocos2d-x for C++
   https://github.com/cocos2d/cocos2d-x/
2. libgdx Desktop/Android/HTML5/iOS Java game development framework
   https://github.com/libgdx/libgdx
3. AndEngine Free Android 2D OpenGL Game Engine
   https://github.com/nicolasgramlich/AndEngine
4. playn A Java game development framework that deploys to JVM, HTML5, Android and iOS.
   https://github.com/threerings/playn
5. LGame This is free 2d game development framework(Java Game Engine), support JavaSE/Android/IOS/WP7/HTML5/PSM/Linux/MAC/Windows.
   https://github.com/cping/LGame
6. LiquidFun LiquidFun is a 2D physics engine for games Developed by GOOGLE
   https://github.com/google/liquidfun
7. jbox2d a 2d Java physics engine, native port of the C++ physics engines Box2D and LiquidFun
   https://github.com/jbox2d/jbox2d

###</ Bluetooth

1. android-beacon-library Allows Android apps to interact with BLE beacons
   https://github.com/AltBeacon/android-beacon-library
2. Android-BluetoothSPPLibrary Bluetooth Serial Port Profile which comfortable to developer application to communication with microcontroller via bluetooth
   https://github.com/akexorcist/Android-BluetoothSPPLibrary

###</ SocialNetworks

1. AndroidSocialNetworks Library for easy work with Facebook, Twitter, LinkedIn and Google on Android
   https://github.com/antonkrasov/AndroidSocialNetworks#license

###</ XMPP

1. asmack A build environment for the XMPP client library Smack on Android
   https://github.com/Flowdalic/asmack
2. Xabber Open source Jabber (XMPP) client with multi-account support, clean and simple interface. Being both free (as in freedom!) and ad-free, Xabber is designed to be the best Jabber client for Android.
   https://github.com/redsolution/xabber-android
3. Conversations Conversations is an open source XMPP (formally known as Jabber) client for Android 4.0+ smart phones.
   https://github.com/siacs/Conversations
4. yaxim YAXIM - Yet Another XMPP Instant Messenger, a jabber client for android
   https://github.com/pfleidi/yaxim
5. androidpn An open source project to provide push notification support for Android -- a xmpp based notification server and a client tool kit.
   https://github.com/dannytiehui/androidpn
6. Android-Paho-Mqtt-Service A simple MQTT Service that will keep running for the duration of your Android application using the Paho Java MQTT Client.
   https://github.com/JesseFarebro/Android-Mqtt

###</ Plugin

1. maven-android-plugin Android Maven Plugin
   https://github.com/jayway/maven-android-plugin
2. android-archetypes Maven Archetypes for Android development
   https://github.com/akquinet/android-archetypes
3. maven-android-sdk-deployer A tool to install components of the Android SDK to use with the Maven Android Plugin.
   https://github.com/mosabua/maven-android-sdk-deployer
4. sdk-manager-plugin Gradle plugin which downloads and manages your Android SDK.
   https://github.com/JakeWharton/sdk-manager-plugin
5. android-holo-colors-idea-plugin IntelliJ / Android Studio plugin for Android Holo Colors
   https://github.com/jeromevdl/android-holo-colors-idea-plugin
6. lein-droid A Leiningen plugin for building Clojure/Android projects
   https://github.com/clojure-android/lein-droid
7. android-selector-chapek Android Studio plugin which automatically generates drawable selectors from appropriately named resources.
   https://github.com/inmite/android-selector-chapek
8. android-parcelable-intellij-plugin IntelliJ Plugin for Android Parcelable boilerplate code generation.
   https://github.com/mcharmas/android-parcelable-intellij-plugin
9. AndroidDynamicLoader A plugin system that runs like a browser, but instead of load web pages, it load plugins which runs natively on Android system.
   https://github.com/mmin18/AndroidDynamicLoader
10. android-sdk-plugin An easy-to-use sbt plugin for working with all Android projects
    https://github.com/pfn/android-sdk-plugin
11. adb-idea A plugin for Android Studio and Intellij IDEA that speeds up your day to day android development.
    https://github.com/pbreault/adb-idea
12. groovy-android-gradle-plugin A Gradle plugin to support the Groovy language for building Android apps
    https://github.com/melix/groovy-android-gradle-plugin
13. apf Android Plugin Framework
    https://github.com/umeng/apf
14. lint-cleaner-plugin A Gradle Plugin for removing unused resources in Android projects.
    https://github.com/marcoRS/lint-cleaner-plugin
15. vim-android Vim plugin to do android development.
    https://github.com/bpowell/vim-android
16. gradle-android-scala-plugin gradle-android-scala-plugin adds scala language support to official gradle android plugin
    https://github.com/saturday06/gradle-android-scala-plugin
17. android-butterknife-zelezny Simple plug-in for Android Studio/IDEA that allows one-click creation of Butterknife view injections.
    https://github.com/inmite/android-butterknife-zelezny
18. m2e-android Android for Maven Eclipse
    https://github.com/rgladwell/m2e-android
19. AndroidProguardScala AndroidProguardScala is an Eclipse plugin that speeds up the development process when you'return using Scala on Android.
    https://github.com/banshee/AndroidProguardScala
20. android-studio-unit-test-plugin Android Studio IDE support for Android gradle unit tests. Prepared for Robolectric.
    https://github.com/evant/android-studio-unit-test-plugin

###</ Code Generation

1. parceler Android Parcelables made easy through code generation.
   https://github.com/johncarl81/parceler
2. auto-parcel Android Parcelable models made easy
   https://github.com/frankiesardo/auto-parcel
3. RoboCoP Pure Java code generation tool for generating a fully functional ContentProvider for Android.
   https://github.com/mediarain/RoboCoP
4. android-contentprovider-generator A small tool to generate an Android ContentProvider.
   https://github.com/BoD/android-contentprovider-generator
5. ParcelablePlease Annotation Processor for generating Parcelable code
   https://github.com/sockeqwe/ParcelablePlease
6. pojobuilder A Java Code Generator for Pojo Builders
   https://github.com/mkarneim/pojobuilder
7. javawriter A utility class which aids in generating Java source files.
   https://github.com/square/javawriter

###</ Media

1. FFmpeg mirror of git://source.ffmpeg.org/ffmpeg.git
   https://github.com/FFmpeg/FFmpeg
2. FFMpeg this is port of ffmpeg for android (this is app, but in future i will do android lib from it and then system will be able to convert videos automatically)
   https://github.com/havlenapetr/FFMpeg
3. libstreaming A solution for streaming H.264, H.263, AMR, AAC using RTP on Android
   https://github.com/fyhertz/libstreaming
4. AndroidFFmpeg FFmpeg build for android random architectures with example jni
   https://github.com/appunite/AndroidFFmpeg
5. android-ffmpeg-java Android Java wrapper around ffmpeg command line binary
   https://github.com/guardianproject/android-ffmpeg-java
6. FFmpeg-Android Script and Instructions for building FFmpeg for Android
   https://github.com/OnlyInAmerica/FFmpeg-Android
7. android-ffmpeg a system for building custom ffmpeg binaries for Android
   https://github.com/guardianproject/android-ffmpeg
8. android-ffmpeg-with-rtmp This repository contains script(s) to build ffmpeg for android with RTMP (and OpenSSL) support.
   https://github.com/cine-io/android-ffmpeg-with-rtmp
9. mp4parser A Java API to read, write and create MP4 files
   https://github.com/sannies/mp4parser
10. jcodec jcodec - a pure java implementation of video/audio codecs.
    https://github.com/jcodec/jcodec

###</ Embedded

1. usb-serial-for-android Android USB host serial driver library for CDC, FTDI, Arduino and other devices.
   https://github.com/mik3y/usb-serial-for-android

###</ Utility

1. smoothie Easy async loading for Android's ListView/GridView
   https://github.com/lucasr/smoothie
2. tape A lightning fast, transactional, file-based FIFO for Android and Java.
   https://github.com/square/tape
3. ColorArt iTunes 11-style color matching code for Android
   https://github.com/MichaelEvans/ColorArt
4. AndroidBillingLibrary Android Market In-app Billing Library https://github.com/robotmedia/AndroidBillingLibrary
5. android-saripaar UI Validation Library for Android
   https://github.com/ragunathjawahar/android-saripaar
6. timber A logger with a small, extensible API which provides utility on top of Android's normal Log class.
   https://github.com/JakeWharton/timber
7. wire Clean, lightweight protocol buffers for Android.
   https://github.com/square/wire
8. motion An Android library allowing images to exhibit a parallax effect that reacts to the device's tilt
   https://github.com/nvanbenschoten/motion
9. Colours A beautiful set of predefined colors and a set of color methods to make your Android development life easier.
   https://github.com/MatthewYork/Colours
10. Android-Validator Form Validator Library for Android
    https://github.com/throrin19/Android-Validator
11. svg-android Support for scalable vector graphics in Android
    https://github.com/pents90/svg-android
12. davdroid DAVdroid – CalDAV/CardDAV synchronization for Android 4+ devices
    https://github.com/rfc2822/davdroid
13. phrase https://github.com/square/phrase
14. seismic Android device shake detection.
    https://github.com/square/seismic
15. android-validation-komensky A simple library for validating user input in forms using annotations.
    https://github.com/inmite/android-validation-komensky
16. AndroidFaceCropper Android bitmap Face Cropper
    https://github.com/lafosca/AndroidFaceCropper
17. AutobahnAndroid WebSocket & WAMP in Java for Android
    https://github.com/tavendo/AutobahnAndroid
18. android_dbinspector Android library for viewing in app databases.
    https://github.com/infinum/android_dbinspector
19. wishlist Utilities I wish Android had but doesn't
    https://github.com/kevinsawicki/wishlist
20. joda-time-android Joda-Time library with Android specialization
    https://github.com/dlew/joda-time-android
21. OpenKeychain OpenKeychain is an OpenPGP implementation for Android.
    https://github.com/open-keychain/open-keychain
22. Silk A library containing a large set of utilities and views for Android apps.
    https://github.com/afollestad/Silk
23. Reservoir Android library to easily serialize and cache your objects to disk using key/value pairs.
    https://github.com/anupcowkur/Reservoir
24. Android-Templates-And-Utilities Collection of source codes, utilities, templates and snippets for Android development.
    https://github.com/petrnohejl/Android-Templates-And-Utilities
25. groundy Sexy way to execute async/background tasks on Android
    https://github.com/telly/groundy
26. EasyCamera Wrapper around the android Camera class that simplifies its usage
    https://github.com/Glamdring/EasyCamera
27. CastCompanionLibrary-android CastCompanionLibrary-android is a library project to enable developers integrate Cast capabilities into their applications faster and easier.
    https://github.com/googlecast/CastCompanionLibrary-android
28. cling UPnP/DLNA library for Java and Android
    https://github.com/4thline/cling
29. dspec A simple way to define and render UI specs on top of your Android UI.
    https://github.com/lucasr/dspec
30. GhostLog Android app that displays the logcat buffer in a system overlay window
    https://github.com/jgilfelt/GhostLog
31. secure-preferences Android Shared preference wrapper than encrypts the keys and values of Shared Preferences. It's not bullet proof security but rather a quick win for incrementally making your android app more secure.
    https://github.com/scottyab/secure-preferences
32. DebugLog Create a simple and more understandable Android logs.
    https://github.com/MustafaFerhan/DebugLog
33. AndroidCaldavSyncAdapater Caldav synch adapter for Android
    https://github.com/gggard/AndroidCaldavSyncAdapater
34. routable-android Routable, an in-app native URL router, for Android
    https://github.com/clayallsopp/routable-android
35. fb-android-dagger A set of helper classes for using dagger with Android components such as Applications, Activities, Fragments, BroadcastReceivers, and Services.
    https://github.com/adennie/fb-android-dagger
36. android-gesture-detectors Gesture detector framework for multitouch handling on Android, based on Android's ScaleGestureDetector
    https://github.com/Almeros/android-gesture-detectors
37. TypedPreferences Preference wrappers for primitive types for Android
    https://github.com/johnjohndoe/TypedPreferences
38. android-intents A collection of well-known Android intents for most common actions
    [https://github.com/d-tarasov/android-intents])(https://github.com/d-tarasov/android-intents)
39. android-intents A small library which will save you from writing the same intent creation code again and again for the most simple tasks
    https://github.com/marvinlabs/android-intents
40. AndroidUtils AndroidUtils
    https://github.com/pardom/AndroidUtils
41. ASimpleCache a simple cache for android and java
    https://github.com/yangfuhai/ASimpleCache
42. svg-android Fork of svg-android +SVN history +Maven +more
    https://github.com/japgolly/svg-android
43. AndroidQuickUtils Android QuickUtils is a development library for the Android platform. It is intended to make application development easier and consistent throughout your applications.
    https://github.com/cesarferreira/AndroidQuickUtils
44. esperandro Easy SharedPreference Engine foR ANDROid
    https://github.com/dkunzler/esperandro
45. AndroidCommons Various useful utilities for Android apps development
    https://github.com/alexvasilkov/AndroidCommons
46. greenrobot-common General purpose utilities and hash functions for Android and Java (aka java-common)
    https://github.com/greenrobot/greenrobot-common
47. puree-android Puree is a log collector for Android.
    https://github.com/cookpad/puree-android

###</ SDK

1. mapbox-android-sdk Open Source Maps SDK for Android
   https://github.com/mapbox/mapbox-android-sdk
2. android-checkout Library for Android In-App Billing (Version 3)
   https://github.com/serso/android-checkout
3. WeatherLib Android Weather Library: android weather lib to develop weather based app fast and easily
   https://github.com/survivingwithandroid/WeatherLib
4. Clusterkraf A clustering library for the Google Maps Android API v2.
   https://github.com/twotoasters/clusterkraf
5. aws-sdk-android Official mirror of the AWS SDK for Android.
   https://github.com/aws/aws-sdk-android
6. evernote-sdk-android Evernote SDK for Android
   https://github.com/evernote/evernote-sdk-android
7. countly-sdk-android Countly Mobile Analytics - Android SDK
   https://github.com/Countly/countly-sdk-android
8. ANE-Facebook Air Native Extension (iOS and Android) for the Facebook mobile SDK
   https://github.com/freshplanet/ANE-Facebook
9. Office-365-SDK-for-Android Office 365 SDK for Android Preview by Microsoft Open Technologies, Inc.
   https://github.com/OfficeDev/Office-365-SDK-for-Android
10. weibo_android_sdk 新浪微博 Android SDK
    https://github.com/sinaweibosdk/weibo_android_sdk
11. socialauth-android SocialAuth repository which contains socialauth android version and samples
    https://github.com/3pillarlabs/socialauth-android
12. PayPal-Android-SDK Accept PayPal and credit cards in your Android app
    https://github.com/paypal/PayPal-Android-SDK
13. barcodescanner Barcode Scanner Libraries for Android
    https://github.com/dm77/barcodescanner
14. android-donations-lib Donations Library for Android. Supports Google Play Store, Flattr, PayPal, and Bitcoin
    https://github.com/dschuermann/android-donations-lib
15. card.io-Android-SDK card.io provides fast, easy credit card scanning in mobile apps
    https://github.com/card-io/card.io-Android-SDK
16. Android-ShareEverywhere This project is the tribute to my favorite Android Widget: the Share button. Share ALL THE THINGS!
    https://github.com/dgmltn/Android-ShareEverywhere
17. android-simpl3r Amazon S3 multipart file upload for Android, made simple
    https://github.com/jgilfelt/android-simpl3r
18. poly-picker Android library project for providing multiple image selection from the device.
    https://github.com/jaydeepw/poly-picker
19. Android-ReactiveLocation Small library that wraps Google Play Service API in brilliant RxJava Observables reducing boilerplate to minimum.
    https://github.com/mcharmas/Android-ReactiveLocation
20. LandscapeVideoCamera Powerful custom Android Camera with granular control over the video quality and filesize, restricting recordings to landscape only.
    https://github.com/jmolsmobile/LandscapeVideoCamera

###</ Test

1. Junit A programmer-oriented testing framework for Java.
   https://github.com/junit-team/junit
2. robotium Like Selenium, but for Android
   https://github.com/RobotiumTech/robotium
3. assertj-android A set of AssertJ helpers geared toward testing Android.
   https://github.com/square/assertj-android
4. selendroid "Selenium for Android" (Test automate native or hybrid Android apps and the mobile web with Selendroid.)
   https://github.com/selendroid/selendroid
5. Cafe A powerful test framework for Android named Case Automated Framework for Everyone.
   https://github.com/BaiduQA/Cafe
6. android-junit-report A custom instrumentation test runner for Android that generates XML reports for integration with other tools.
   https://github.com/jsankey/android-junit-report
7. robolectric Android Unit Testing Framework
   https://github.com/xtremelabs/robolectric

###</ Chart

1. GraphView Android Graph Library for creating zoomable and scrollable line and bar graphs.
   https://github.com/jjoe64/GraphView
2. MPAndroidChart A simple Android chart view / graph view library, supporting line- bar- pie- and candlestick charts as well as scaling, dragging and animations.
   https://github.com/PhilJay/MPAndroidChart
3. EazeGraph An Android chart and graph library
   https://github.com/blackfizz/EazeGraph
4. AndroidCharts An easy-to-use Android charts library with animation.
   https://github.com/HackPlan/AndroidCharts
5. WilliamChart Android library to create charts.
   https://github.com/diogobernardino/WilliamChart
6. Android-Charts Open-source native Android graph/chart framework includes line chart,stick chart,candlestick chart,pie chart,spider-web chart etc.
   https://github.com/limccn/Android-Charts
7. XCL-Charts Android开源图表库(XCL-Charts is a free charting library for Android platform.)
   https://github.com/xcltapestry/XCL-Charts
8. desCharts Android Charting Library
   https://github.com/bradipao/desCharts
9. HelloCharts Charts/graphs library for Android compatible with API 8+
   https://github.com/lecho/hellocharts-android
10. HoloGraphLibrary Fork of the HoloGraphLibrary by Daniel Nadeau with additionnal features
    https://github.com/Androguide/HoloGraphLibrary

###</ Icons

1. Skycons Forecast / DarkSky's Skycons, Animated Weather icons recreated for Android
   https://github.com/torryharris/Skycons
2. droidicon Over 1600 customizable icons for Android including 750+ Google Material Design icons, 25 ready-made social badges, and more!
   https://github.com/theDazzler/droidicon
3. Android-Iconics Android-Iconics is a library to use (almost) any alternative iconfont in your projects. It allows you to add any Android-Iconics compatible typeface-library-addon to your project and you are able to start using that font.
   https://github.com/mikepenz/Android-Iconics
4. android-material-icons Easy to use material icons for Android
   https://github.com/Malinskiy/android-material-icons
5. androidicons Androidicons is a professional, handcrafted icon set with 250 icons in 14 different colors and 5 sizes, including an icon font and all sources.
   https://github.com/opoloo/androidicons

###</ Colors

1. Android-Material-Design-Colors Android Material Design Colors
   https://github.com/wada811/Android-Material-Design-Colors

###</ Font

1. Calligraphy Custom fonts in Android the easy way...
   https://github.com/chrisjenx/Calligraphy
2. android-typeface-helper Typeface helper for Android
   https://github.com/norbsoft/android-typeface-helper
3. Android-Icon-Fonts Material and Holo iconic fonts.
   https://github.com/johnkil/Android-Icon-Fonts
4. Print A lightweight Android library for use iconic fonts.
   https://github.com/johnkil/Print/
5. TypefaceHelper Helper object for injecting typeface into various text views of android.
   https://github.com/Drivemode/TypefaceHelper

###</ OpenGL

1. Rajawali Rajawali is a 3D engine for Android based on OpenGL ES 2.0/3.0. It can be used for normal apps as well as live wallpapers.
   https://github.com/MasDennis/Rajawali

###</ Debug

1. android-grid-wichterle This app will show grid overlay over whole system which helps you to verify your excellent app design.
   https://github.com/inmite/android-grid-wichterle

###</ Demo

1. android-demos Examples of Android applications
   https://github.com/novoda/android-demos
2. u2020 A sample Android app which showcases advanced usage of Dagger among other open source libraries.
   https://github.com/JakeWharton/u2020
3. BlurEffectForAndroidDesign Sample to show how to implement blur graphical tricks
   https://github.com/PomepuyN/BlurEffectForAndroidDesign
4. maven-android-plugin-samples Usage examples for Android Maven Plugin
   https://github.com/jayway/maven-android-plugin-samples
5. Android-WizardPager Android pager-style wizard flow sample code
   https://github.com/romannurik/Android-WizardPager
6. AndroidPushNotificationsDemo A example of an android app that receives push notifications using MQTT.
   https://github.com/tokudu/AndroidPushNotificationsDemo
7. android-basic-samples Google Play game services - Android samples
   https://github.com/playgameservices/android-basic-samples
8. RobolectricSample Sample project demonstrating use of the Robolectric Android testing project
   https://github.com/robolectric/RobolectricSample
9. android-demo Android common lib demo, include ImageCache, HttpCache, DropDownListView, DownloadManager, install apk silent and so on, you can find description
   https://github.com/Trinea/android-demo
10. android-movies-demo Sample application demonstrating Android design and animation
    https://github.com/dlew/android-movies-demo
11. maven-android-plugin-samples Usage examples for Android Maven Plugin
    https://github.com/jayway/maven-android-plugin-samples
12. android-http-examples Sample code for HTTP on Android.
    https://github.com/swankjesse/android-http-examples
13. androidmvp MVP Android Example
    https://github.com/antoniolg/androidmvp
14. ProgrammingAndroidExamples This repo contains example code for O'Reilly's "Programming Android" by Zigured Mednieks, Laird Dornin, Blake Meike and Masumi Nakamura
    https://github.com/bmeike/ProgrammingAndroidExamples
15. android-layout-samples Explorations around Android custom layouts
    https://github.com/lucasr/android-layout-samples
16. LearningAndroidYamba This is the code that goes along with Learning Android book.
    https://github.com/twitter-university/LearningAndroidYamba
17. RoboDemo RoboDemo is a ShowCase library for Android to demonstrate to users how a given Activity works.
    https://github.com/stephanenicolas/RoboDemo
18. ProgrammingAndroid2Examples This repo contains example code for O'Reilly's "Programming Android" by Zigured Mednieks, Laird Dornin, Blake Meike and Masumi Nakamura
    https://github.com/bmeike/ProgrammingAndroid2Examples
19. hellomap-android Quick start with the Google Maps Android API
    https://github.com/googlemaps/hellomap-android
20. GraphView-Demos Examples for my Android GraphView library
    https://github.com/jjoe64/GraphView-Demos
21. Android-Volley-Example Android volley library examples
    https://github.com/PareshMayani/Android-Volley-Example
22. android-demos Google Drive Android API Demos
    https://github.com/googledrive/android-demos
23. AndroidDemoProjects Collection of Small Android Projects
    https://github.com/PaulTR/AndroidDemoProjects
24. android-ActivitySceneTransition Demonstrates how to the use Activity scene transitions when transitions from one Activity to another. Uses a combination of moveImage and changeBounds to nicely transition a grid of images to an Activity with a large image and detail text.
    https://github.com/googlesamples/android-ActivitySceneTransition
25. android_L_preview_example This project is focused on the sample using the API's new preview version of Android-L, use of transitions, shadows etc... https://github.com/saulmm/android_L_preview_example
26. googletv-android-samples Source for many GoogleTV Example applications.
    https://github.com/google/googletv-android-samples
27. Android-RxJava Learning RxJava for Android by example
    https://github.com/kaushikgopal/Android-RxJava
28. Android-LollipopShowcase A simple app to showcase some of the cool new cool stuff in Android L. RecyclerView, CardView, ActionBarDrawerToggle, DrawerLayout, Animations, Android Compat Design, Toolbar
    https://github.com/mikepenz/Android-LollipopShowcase
29. QuickNews This is a news client, similar to netease, news headlines
    https://github.com/tigerguixh/QuickNews
30. android-best-practices Do's and Don'ts for Android development, by Futurice developers
    https://github.com/futurice/android-best-practices
31. ToolbarMenudrawer Quick example for the new Toolbar (and Menudrawer) API. Thanks for starring / forking me. :')
    https://github.com/I-am-Reinvented/ToolbarMenudrawer
32. Android-PullLayout 仿UC天气下拉和微信下拉眼睛
    https://github.com/BlueMor/Android-PullLayout
33. DragLayout An Android Project.ViewDragHelper.QQ.QQ5.0.侧滑
    https://github.com/BlueMor/DragLayout
34. rx-android-architecture An example project of an Android architecture built on RxJava
    https://github.com/tehmou/rx-android-architecture
35. AndroidCoolDragAndDropGridView An example of a gridview with various column span items and drag and drop support like Google keep has
    https://github.com/theredsunrise/AndroidCoolDragAndDropGridView
36. Demo-GoogleBook-Android An android demo about searching and displaying books details using Google book api.
    https://github.com/Jungerr/Demo-GoogleBook-Android
37. Demo-YouTuBe-Android An android demo about searching and playing youtube videos with youtube player or videoview.
    https://github.com/Jungerr/Demo-YouTuBe-Android
38. android-proguard-snippets Proguard configurations for common Android libraries
    https://github.com/krschultz/android-proguard-snippets
39. ViewPagerHeaderScrollDemo ViewPagerHeaderScrollDemo
    https://github.com/ongakuer/ViewPagerHeaderScrollDemo
40. Quality-Tools-for-Android This is an Android sample app + tests that will be used to work on various project to increase the quality of the Android platform.
    https://github.com/stephanenicolas/Quality-Tools-for-Android
41. socket.io-android-chat A simple chat demo for socket.io and Android
    https://github.com/nkzawa/socket.io-android-chat
42. AndroidTVExplorer A sample project which can be used as a base in order to develop Media Library applications for Android TV. Follow the series of blogs starting at http://www.malmstein.com/blog/2014/10/21/building-applications-for-android-tv/ in order to keep up to date with the process
    https://github.com/malmstein/AndroidTVExplorer
43. Android-Notification-Example A simple sample showing the different types of notifications on Andoid
    https://github.com/saulmm/Android-Notification-Example
44. androidmvp MVP Android Example used to explain how to use this pattern in our Android apps. This code was created to support an article explanation.
    https://github.com/antoniolg/androidmvp

###</ App

1. 2048-android The android port of the 2048 game (for offline playing)
   https://github.com/uberspot/2048-android
2. FeedEx FeedEx News Reader is a light and modern Android feed reader, based on Sparse rss.
   https://github.com/HoloAddict/FeedEx
3. rubychina4android Ruby-China的Android客户端
   https://github.com/gonjay/rubychina4android
4. HackerNews An open source Hacker News client for Android.
   https://github.com/bishopmatthew/HackerNews
5. News-Android-App ownCloud News Reader - Android App
   https://github.com/owncloud/News-Android-App
6. android-delicious Delicious Android is an Android app which helps you access and save bookmarks via Delicious. It's available over at Google Play.
   https://github.com/lexs/android-delicious
7. droidplanner Ground Control Station for Android Devices
   https://github.com/DroidPlanner/droidplanner
8. FoldingNavigationDrawer-Android This is a sample project present how to use Folding-Android to add Folding Efect to Navigation Drawer.
   https://github.com/tibi1712/FoldingNavigationDrawer-Android
9. play-android Stream music and control the queue of a play server from your Android device.
   https://github.com/play/play-android
10. vanilla Vanilla Music Player for Android (abandoned)
    https://github.com/kreed/vanilla
11. OpenFlappyBird An open source clone of a famous flappy bird game for Android using AndEngine
    https://github.com/deano2390/OpenFlappyBird
12. TurtlePlayer A Free, Fully Fledged, Open-Source Music Player for Android
    https://github.com/eddturtle/TurtlePlayer
13. seadroid Android client for Seafile
    https://github.com/haiwen/seadroid
14. freegemas-gdx Freegemas libGDX is an Android and Java desktop port of Freegemas, which in turn is an open source version of the well known Bejeweled.
    https://github.com/siondream/freegemas-gdx
15. kanxue-android-app 看雪安全论坛 Android 客户端
    https://github.com/kanxue-team/kanxue-android-app
16. FlappyCow Android game in "Flappy Bird" Style
    https://github.com/cubei/FlappyCow 1.wakao-app 哇靠百科 － 一款聚合了众多笑话段子、妹子图、微信公众号文章的Android App。
    https://github.com/yongbo000/wakao-app
17. Twidere-Android Twidere is a powerful twitter client for Android 1.6+ 1 , which gives you a full Holo experience and nearly full Twitter's feature.
    https://github.com/TwidereProject/Twidere-Android
18. Telecine Record full-resolution video on your Android devices.
    https://github.com/JakeWharton/Telecine
19. TopNews 高仿“今日头条”客户端，实现它大部分的功能，练习之作，目的了解怎么发开一个新闻类客户端，从涉及的相关知识点中提升自我水平。
    https://github.com/Rano1/TopNews
20. WaniKani-for-Android An Android client application for the awesome kanji learning website wanikani.com
    https://github.com/xiprox/WaniKani-for-Android
21. OpenLibra-Material OpenLibra client on Material Design
    https://github.com/saulmm/OpenLibra-Material

###</ Security

1. gnupg-for-android A port of gnupg to Android
   https://github.com/guardianproject/gnupg-for-android
2. openssl-android a version of the official Android openssl setup to build standalone for use in app
   https://github.com/guardianproject/openssl-android
3. apg OpenPGP for Android
   https://github.com/thialfihar/apg
4. android-grid-wichterle This app will show grid overlay over whole system which helps you to verify your excellent app design.
   https://github.com/inmite/android-grid-wichterle

###</ Tools

1. scrollscreenshot Make Android screenshots of scrollable screen content
   https://github.com/PGSSoft/scrollscreenshot

2. dex-method-counts Command-line tool to count per-package methods in Android .dex files
   https://github.com/mihaip/dex-method-counts

3. osmtracker-android GPS tracking tool for OpenStreetMap
   https://github.com/nguillaumin/osmtracker-android

4. ProMosaic Make mosaic effect on android
   https://github.com/coderkiss/ProMosaic

5. enroscar A set of Android tools that facilitate apps development
   https://github.com/stanfy/enroscar

6. android-device-frame-generator Wrap your app screenshots in real device artwork
   http://f2prateek.com/android-device-frame-generator/

7. AndroidGradleStarter Android Gradle Starter
   https://github.com/ravidsrk/AndroidGradleStarter

8. android-gradle-template Combines Android Studio, Gradle, Espresso, Robolectric, AndroidAnnotations, RoboCoP, JaCoCo
   https://github.com/nenick/android-gradle-template

9. swiftp FTP server for your android device.
   https://github.com/ppareit/swiftp

10. NotificationLog Use an expanded notification as a makeshift Android log output console.
    https://github.com/jgilfelt/NotificationLog

11. Java7-on-Android Java 7 features backported to Android 2.2+
    https://github.com/yareally/Java7-on-Android

12. Genius-Android 一个在Android中能经常使用的库集合，包括日志，命令行语句执行；Ping,DNS,Telnet,TraceRoute等网络包；同时包含一套UI主题。
    https://github.com/qiujuer/Genius-Android

13. TaggerString TaggerString is very light library which allows to build dynamic string resource in much more readable way.
    https://github.com/polok/TaggerString

14. svg2android SVG to Android VectorDrawable XML resource file
    https://github.com/inloop/svg2android

15. gplay.ws create a badge to promote your own Android application in a single step
    http://gplay.ws/

16. gradle-play-publisher Gradle Plugin to upload your APK and metadata to the Google Play Store
    https://github.com/Triple-T/gradle-play-publisher

17. android-lifecycle A diagram of the Android Activity / Fragment lifecycle
    [https://github.com/xxv/android-lifecycle][https://github.com/xxv/android-lifecycle]

18. AndroidDevTools 收集整理Android开发所需的Android SDK、开发中用到的工具、Android开发教程、Android设计规范，免费的设计素材等。
    https://github.com/inferjay/AndroidDevTools

19. gradle-packer-plugin Android Packer Gradle Plugin
    https://github.com/mcxiaoke/gradle-packer-plugin

20. AndroidLocalizationer This is a Android Studio/ IntelliJ IDEA plugin to localize your Android app, translate your string resources automactically.
    https://github.com/westlinkin/AndroidLocalizationer

###</ Decompiler

1. jadx Dex to Java decompiler
   https://github.com/skylot/jadx
2. simplify Generic Android Deobfuscator
   https://github.com/CalebFenton/simplify

###</ Gradle plugin

1. android-native-dependencies Gradle plugin for resolving and downloading Android native dependencies (.so)
   https://github.com/nhachicha/android-native-dependencies

###</ Android Wear

1. BusWear EventBus for Android Wear devices.
   https://github.com/tajchert/BusWear

###</ Other

1. DiskLruCache Java implementation of a Disk-based LRU cache which specifically targets Android compatibility.
   https://github.com/JakeWharton/DiskLruCache
2. anode Android framework for node.js applications
   https://github.com/paddybyers/anode
3. Fragment-Switcher An instance-state saving fragment switcher, intended for use with navigation drawers or tabs.
   https://github.com/jacobtabak/Fragment-Switcher