AnimatedBottomBar

A customizable and easy to use bottom bar view with sleek animations.

Examples

Playground app

Download the playground app: demo.apk. In this app you can try out all features and even generate XML layouts.

Contents

• Getting started
• Managing tabs
• Usage with ViewPager
• Configuration

Getting started

Add the following dependency to your build.gradle:

implementation 'nl.joery.animatedbottombar:library:1.0.8'

Define AnimatedBottomBar in your XML layout with custom attributes.

<nl.joery.animatedbottombar.AnimatedBottomBar
    android:id="@+id/bottom_bar"
    android:background="#FFF"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:abb_selectedTabType="text"
    app:abb_indicatorAppearance="round"
    app:abb_indicatorMargin="16dp"
    app:abb_indicatorHeight="4dp"
    app:abb_tabs="@menu/tabs"
    app:abb_selectedIndex="1" />

Create a file named tabs.xml in the res/menu/ resources folder:

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/tab_home"
        android:icon="@drawable/home"
        android:title="@string/home" />
    <item
        android:id="@+id/tab_alarm"
        android:icon="@drawable/alarm"
        android:title="@string/alarm" />
    <item
        android:id="@+id/tab_bread"
        android:icon="@drawable/bread"
        android:title="@string/bread" />
    <item
        android:id="@+id/tab_cart"
        android:icon="@drawable/cart"
        android:title="@string/cart" />
</menu>

Get notified when the selected tab changes by setting callbacks:

bottom_bar.onTabSelected = {
    Log.d("bottom_bar", "Selected tab: " + it.title)
}
bottom_bar.onTabReselected = {
    Log.d("bottom_bar", "Reselected tab: " + it.title)
}

Or set a listener if you need more detailed information:

bottom_bar.setOnTabSelectListener(object : AnimatedBottomBar.OnTabSelectListener {
    override fun onTabSelected(
        lastIndex: Int,
        lastTab: AnimatedBottomBar.Tab?,
        newIndex: Int,
        newTab: AnimatedBottomBar.Tab
    ) {
        Log.d("bottom_bar", "Selected index: $newIndex, title: ${newTab.title}")
    }

    // An optional method that will be fired whenever an already selected tab has been selected again.
    override fun onTabReselected(index: Int, tab: AnimatedBottomBar.Tab) {
        Log.d("bottom_bar", "Reselected index: $index, title: ${tab.title}")
    }
})

Managing tabs

Short overview on how to manage tabs using code.

Creating new tabs

// Creating a tab by passing values
val bottomBarTab1 = AnimatedBottomBar.createTab(drawable, "Tab 1")

// Creating a tab by passing resources
val bottomBarTab2 = AnimatedBottomBar.createTab(R.drawable.ic_home, R.string.tab_2, R.id.tab_home)

Adding new tabs

// Adding a tab at the end
AnimatedBottomBar.addTab(bottomBarTab1)

// Add a tab at a specific position
AnimatedBottomBar.addTabAt(1, bottomBarTab2)

Removing tabs

// Removing a tab by object reference
val tabToRemove = AnimatedBottomBar.tabs[1]
AnimatedBottomBar.removeTab(tabToRemove)

// Removing a tab at a specific position
AnimatedBottomBar.removeTabAt(tabPosition)

// Removing a tab by the given ID resource
AnimatedBottomBar.removeTabById(R.id.tab_home)

Selecting tabs

// Selecting a tab by object reference
val tabToSelect = AnimatedBottomBar.tabs[1]
AnimatedBottomBar.selectTab(tabToSelect)

// Selecting a tab at a specific position
AnimatedBottomBar.selectTabAt(1)

// Selecting a tab by the given ID resource
AnimatedBottomBar.selectTabById(R.id.tab_home)

Enabling / disabling tabs

// Disabling a tab by object reference
val tabToDisable = AnimatedBottomBar.tabs[1]
AnimatedBottomBar.setTabEnabled(tabToDisable, false) // Use true for re-enabling the tab

// Disabling a tab at a specific position
AnimatedBottomBar.setTabEnabledAt(1, false)

// Disabling a tab by the given ID resource
AnimatedBottomBar.setTabEnabledById(R.id.tab_home, false)

Intercepting tabs

Could be useful for example restricting access to a premium area. You can use a callback or a more detailed listener:

bottom_bar.onTabIntercepted = {
    if (newTab.id == R.id.tab_pro_feature && !hasProVersion) {
        // e.g. show a dialog
        false
    }
    true
}

Detailed listener:

bottom_bar.setOnTabInterceptListener(object : AnimatedBottomBar.OnTabInterceptListener {
    override fun onTabIntercepted(
        lastIndex: Int,
        lastTab: AnimatedBottomBar.Tab?,
        newIndex: Int,
        newTab: AnimatedBottomBar.Tab
    ): Boolean {
        if (newTab.id == R.id.tab_pro_feature && !hasProVersion) {
            // e.g. show a dialog
            return false
        }
        return true
    }
})

Usage with ViewPager

It is easy to use the BottomBar with a ViewPager or ViewPager2, you can simply use the setupWithViewPager() method. Please note that the number of tabs and ViewPager pages need to be identical in order for it to function properly.

Usage

// For ViewPager use:
bottom_bar.setupWithViewPager(yourViewPager)

// For ViewPager2 use:
bottom_bar.setupWithViewPager2(yourViewPager2)

Configuration

An overview of all configuration options. All options can also be accessed and set programmatically, by their equivalent name.

Tabs

Attribute	Description	Default
abb_tabs	Tabs can be defined in a menu file (Menu resource), in the res/menu/ resource folder. The icon and title attribute are required. By default all tabs are enabled, set android:enabled to false to disable a tab. <menu xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/tab_example" android:icon="@drawable/ic_example" android:title="@string/tab_example" android:enabled="true|false" /> ...etc </menu>
abb_selectedIndex	Define the default selected tab index.
abb_selectedTabId	Define the default selected tab by its ID, for example @id/tab_id

Tab appearance

Attribute	Description	Default
abb_selectedTabType	Determines whether the icon or text should be shown when a tab has been selected. icon text	icon
abb_tabColor	The color of the icon or text when the tab is not selected.	@color/textColorPrimary
abb_tabColorSelected	The color of the icon or text when the tab is selected.	@color/colorPrimary
abb_tabColorDisabled	The color of the icon or text whenever the tab has been disabled.	@color/textColorSecondary
abb_textAppearance	Customize the look and feel of text in tabs, down below is an example of a custom text appearance. Define a new style in res/values/styles.xml: <style name="CustomText"> <item name="android:textAllCaps">true</item> <item name="android:fontFamily">serif</item> <item name="android:textSize">16sp</item> <item name="android:textStyle">italic|bold</item> </style>
abb_textStyle	Style (normal, bold, italic, bold|italic) for the text. Use bottom_bar.typeface to programmatically set text style.	normal
abb_textSize	Size of the text. Recommended dimension type for text is "sp" for scaled-pixels (example: 15sp).	14sp
abb_iconSize	Increase or decrease the size of the icon.	24dp
abb_rippleEnabled	Enables the 'ripple' effect when selecting a tab.	false
abb_rippleColor	Change the color of the aforementioned ripple effect.	Default theme color

Animations

Attribute	Description	Default
abb_animationDuration	The duration of all animations, including the indicator animation.	400
abb_tabAnimation	The enter and exit animation style of the tabs which are not selected. none slide fade	fade
abb_tabAnimationSelected	The enter and exit animation style of the selected tab. none slide fade	slide
abb_animationInterpolator	The interpolator used for all animations. See "Android Interpolators: A Visual Guide" for more information on available interpolators. Example value: @android:anim/overshoot_interpolator	FastOutSlowInInterpolator

Indicator

Attribute	Description	Default
abb_indicatorColor	The color of the indicator.	@android/colorPrimary
abb_indicatorHeight	The height of the indicator.	3dp
abb_indicatorMargin	The horizontal margin of the indicator. This determines the width of the indicator.	0dp
abb_indicatorAppearance	Configure the shape of the indicator either to be square or round. invisible square round	square
abb_indicatorLocation	Configure the location of the selected tab indicator, top, bottom or invisible. top bottom	top
abb_indicatorAnimation	The animation type of the indicator when changing the selected tab. none slide fade	slide

Credits

• https://dribbble.com/shots/6130593-Readable-Tab-Bar
  Inspiration for creating this library.

License

MIT License

Copyright (c) 2020 Joery Droppers (https://github.com/Droppers)

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.