The RecyclerView is one of the most used widgets in the Android world, and with it you have to implement an Adapter which provides the items for the view. Most use cases require the same base logic, but require you to write everything again and again.
The FastAdapter is here to simplify this process. You don't have to worry about the adapter anymore. Just write the logic for how your view/item should look like, and you are done. This library has a fast and highly optimized core which provides core functionality, most apps require. It also prevents common mistakes by taking away those steps from the devs. Beside being blazing fast, minimizing the code you need to write, it is also really easy to extend. Just provide another adapter implementation, hook into the adapter chain, custom select / deselection behaviors. Everything is possible.
- Click / Long-Click listeners
- Selection / Multi-Selection (MultiselectSample, CheckBoxSample, RadioButtonSample)
- Expandable items (ExpandableSample, IconGridSample ,AdvancedSample)
- Write less code, get better results
- Highly optimized code
- Simple Drag & Drop (SimpleItemListSample)
- Headers (StickyHeaderSample, AdvancedSample)
- Footers
- Filter (SimpleItemListSample)
- Includes suggestions from the Android Team
- Easily extensible
- Endless Scroll (EndlessScrollSample)
- "Leave-Behind"-Pattern (SwipeListSample)
- Split item view and model (GenericItem, MultiTypeGenericItem)
- Chain other Adapters (SimpleItemListSample, StickyHeaderSample)
- Comes with useful Helpers
- ActionModeHelper (MultiselectSample)
- UndoHelper (MultiselectSample)
- More to come...
- FastScroller (external lib) (SimpleItemListSample)
You can try it out here Google Play (or download the latest release from GitHub)
The library is split up into core, commons, and extensions. The core functions are included in the following dependency.
compile('com.mikepenz:fastadapter:2.6.0@aar') {
transitive = true
}The commons package comes with some useful helpers (which are not needed in all cases) This one for example includes the FastItemAdapter
compile 'com.mikepenz:fastadapter-commons:2.6.0@aar'All additions are included in the following dependency.
compile 'com.mikepenz:fastadapter-extensions:2.6.0@aar'
//The tiny Materialize library used for its useful helper classes
compile 'com.mikepenz:materialize:1.0.2@aar'If you upgrade from < 2.5.0 follow the MIGRATION GUIDE
Just create a class which extends the AbstractItem as shown below. Implement the methods, and your item is ready.
public class SampleItem extends AbstractItem<SampleItem, SampleItem.ViewHolder> {
public String name;
public String description;
//The unique ID for this type of item
@Override
public int getType() {
return R.id.fastadapter_sampleitem_id;
}
//The layout to be used for this type of item
@Override
public int getLayoutRes() {
return R.layout.sample_item;
}
//The logic to bind your data to the view
@Override
public void bindView(ViewHolder viewHolder, List<Object> payloads) {
//call super so the selection is already handled for you
super.bindView(viewHolder, payloads);
//bind our data
//set the text for the name
viewHolder.name.setText(name);
//set the text for the description or hide
viewHolder.description.setText(description);
}
//reset the view here (this is an optional method, but recommended)
@Override
public void unbindView(ViewHolder holder) {
super.unbindView(holder);
holder.name.setText(null);
holder.description.setText(null);
}
//Init the viewHolder for this Item
@Override
public ViewHolder getViewHolder(View v) {
return new ViewHolder(v);
}
//The viewHolder used for this item. This viewHolder is always reused by the RecyclerView so scrolling is blazing fast
protected static class ViewHolder extends RecyclerView.ViewHolder {
protected TextView name;
protected TextView description;
public ViewHolder(View view) {
super(view);
this.name = (TextView) view.findViewById(com.mikepenz.materialdrawer.R.id.material_drawer_name);
this.description = (TextView) view.findViewById(com.mikepenz.materialdrawer.R.id.material_drawer_description);
}
}
}//create our FastAdapter which will manage everything
FastItemAdapter fastAdapter = new FastItemAdapter();
//set our adapters to the RecyclerView
//we wrap our FastAdapter inside the ItemAdapter -> This allows us to chain adapters for more complex useCases
recyclerView.setAdapter(fastAdapter);
//set the items to your ItemAdapter
fastAdapter.add(ITEMS);fastAdapter.withSelectable(true);
fastAdapter.withOnClickListener(new FastAdapter.OnClickListener<Item>() {
@Override
public boolean onClick(View v, IAdapter<Item> adapter, Item item, int position) {
// Handle click here
return true;
}
});//just add an `EventHook` to your `FastAdapter` by implementing either a `ClickEventHook`, `LongClickEventHook`, `TouchEventHook`, `CustomEventHook`
fastItemAdapter.withItemEvent(new ClickEventHook<SampleItem> {
@Override
public View onBind(@NonNull RecyclerView.ViewHolder viewHolder) {
//return the views on which you want to bind this event
if (viewHolder instanceof SampleItem.ViewHolder) {
return ((ViewHolder) viewHolder).view;
}
return null;
}
@Override
public void onClick(View v, int position, FastAdapter<SampleItem> fastAdapter, SampleItem item) {
//react on the click event
}
});// Call this in onQueryTextSubmit() & onQueryTextChange() when using SearchView
fastAdapter.filter("yourSearchTerm");
fastAdapter.withFilterPredicate(new IItemAdapter.Predicate<Item>() {
@Override
public boolean filter(Item item, CharSequence constraint) {
return item.getName().startsWith(String.valueOf(constraint));
}
});filter() will return true to indicate which items will be removed. Returning false indicates items that will be retained.
First, attach ItemTouchHelper to RecyclerView.
SimpleDragCallback dragCallback = new SimpleDragCallback(this);
ItemTouchHelper touchHelper = new ItemTouchHelper(dragCallback);
touchHelper.attachToRecyclerView(recyclerView);Implement ItemTouchCallback interface in your Activity, and override the itemTouchOnMove() method.
@Override
public boolean itemTouchOnMove(int oldPosition, int newPosition) {
Collections.swap(fastAdapter.getAdapterItems(), oldPosition, newPosition); // change position
fastAdapter.notifyAdapterItemMoved(oldPosition, newPosition);
return true;
}Start by initializing your adapters:
FastItemAdapter fastAdapter = new FastItemAdapter<>();
// Head is a model class for your header
HeaderAdapter<Header> headerAdapter = new HeaderAdapter<>();Initialize a generic FastAdapter:
FastItemAdapter<IItem> fastAdapter = new FastItemAdapter<>();Finally, set the adapter:
recyclerView.setAdapter(headerAdapter.wrap(fastAdapter));It is also possible to add in a third ViewHolder type by using the wrap() method again.
recyclerView.setAdapter(thirdAdapter.wrap(headerAdapter.wrap(fastAdapter)));Create a FooterAdapter. We need this to display a loading ProgressBar at the end of our list.
FooterAdapter<ProgressItem> footerAdapter = new FooterAdapter<>();Keep in mind that ProgressItem is provided by FastAdapter’s extensions.
recyclerView.addOnScrollListener(new EndlessRecyclerOnScrollListener(footerAdapter) {
@Override
public void onLoadMore(int currentPage) {
footerAdapter.clear();
footerAdapter.add(new ProgressItem().withEnabled(false));
// Load your items here and add it to FastAdapter
fastAdapter.add(NEWITEMS);
}
});For the complete tutorial and more features such as multi-select and CAB check out the sample app or, read blog post.
- As of v2.5.0 there are no more known requirements to use the
FastAdapterwith Proguard
The FastAdapter comes with native support for expandable items. These items have to implement the IExpandable interface, and the sub items the ISubItem interface. This allows better support.
The sample app provides sample implementations of those. (Those in the sample are kept generic which allows them to be used with different parent / subitems)
As of the way how SubItems and their state are handled it is highly recommended to use the identifier based StateManagement. Just add withPositionBasedStateManagement(false) to your FastAdapter setup.
A simple item just needs to extend from the AbstractExpandableItem and provide the Parent, the ViewHolder and the SubItems it will contain as type.
public class SimpleSubExpandableItem extends AbstractExpandableItem<SimpleSubExpandableItem, SimpleSubExpandableItem.ViewHolder, SubItem> {
/**
* BASIC ITEM IMPLEMENTATION
*/
}Mike Penz:
- AboutLibraries https://github.com/mikepenz/AboutLibraries
- Android-Iconics https://github.com/mikepenz/Android-Iconics
- ItemAnimators https://github.com/mikepenz/ItemAnimators
- MaterialDrawer https://github.com/mikepenz/MaterialDrawer
Other Libs:
- Butterknife https://github.com/JakeWharton/butterknife
- Glide https://github.com/bumptech/glide
- MaterialScrollBar https://github.com/krimin-killr21/MaterialScrollBar
- StickyRecyclerHeadersAdapter https://github.com/timehop/sticky-headers-recyclerview
-
Mike Penz
-
Fabian Terhorst
This free, open source software was also made possible by a group of volunteers that put many hours of hard work into it. See the CONTRIBUTORS.md file for details.
I want to give say thanks to some special contributors who provided some huge PRs and many changes to improve this great library.
Copyright 2017 Mike Penz
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.