HeaderRecyclerView

HeaderRecyclerView is an Android library created to be able to use RecyclerView.Adapter with a header in a easy way. To use this library create your RecyclerView.Adapter classes extending from HeaderRecyclerViewAdapter.

Screenshots

Usage

To use HeaderRecyclerView in your application you have to follow this steps:

1 - Create a class extending from HeaderRecyclerViewAdapter:

public class DragonBallAdapter extends HeaderRecyclerViewAdapter<RecyclerView.ViewHolder, DragonBallHeader, DragonBallCharacter> {

2 - Implement onCreateHeaderViewHolder, onCreateItemViewHolder, onBindItemViewHolder and onBindViewHolder to create your RecyclerView.ViewHolder instances and draw your rows:

@Override
  protected RecyclerView.ViewHolder onCreateHeaderViewHolder(ViewGroup parent, int viewType) {
    LayoutInflater inflater = getLayoutInflater(parent);
    View headerView = inflater.inflate(R.layout.row_dragon_ball_header, parent, false);
    return new HeaderViewHolder(headerView);
  }

  @Override
  protected RecyclerView.ViewHolder onCreateItemViewHolder(ViewGroup parent, int viewType) {
    LayoutInflater inflater = getLayoutInflater(parent);
    View characterView = inflater.inflate(R.layout.row_dragon_ball_character, parent, false);
    return new CharacterViewHolder(characterView);
  }

  @Override protected void onBindHeaderViewHolder(RecyclerView.ViewHolder holder, int position) {
    DragonBallHeader header = getHeader();
    HeaderViewHolder headerViewHolder = (HeaderViewHolder) holder;
    headerViewHolder.render(header);
  }

  @Override protected void onBindItemViewHolder(RecyclerView.ViewHolder holder, int position) {
    DragonBallCharacter character = getItem(position);
    CharacterViewHolder characterViewHolder = (CharacterViewHolder) holder;
    characterViewHolder.render(character);
  }

3 - Configure your RecyclerView widget with this layout:

  List<DragonBallCharacter> characters = getDragonBallCharacters();
  DragonBallHeader header = getHeader(characters);
  adapter.setHeader(header);
  adapter.setItems(characters);
  recyclerView.setAdapter(adapter);

You can use methods like isHeaderType(viewType) or isHeaderPosition(position) to return the ViewHolder associated to the header or to draw the view associated to the header. The header instance can be obtained using the method getHeader().

4 - If you are using a GridLayoutManager instead of a LinearLayoutManager remember you'll have to configure the SpanSizeLookup used in the LayoutManager instance. If you are using HeaderRecyclerView with a GridLayoutManager you can create an instance of HeaderSpanSizeLookup and configure your LayoutManager instance:

  GridLayoutManager layoutManager = new GridLayoutManager(this, NUMBER_OF_COLUMNS);
  HeaderSpanSizeLookup headerSpanSizeLookup = new HeaderSpanSizeLookup(adapter, layoutManager);
  layoutManager.setSpanSizeLookup(headerSpanSizeLookup);

Add it to your project

Add HeaderRecyclerView dependency to your build.gradle file

dependencies{
    compile 'com.karumi:headerrecyclerview:1.0.0'
}

or to your pom.xml if you are using Maven instead of Gradle

<dependency>
    <groupId>com.karumi</groupId>
    <artifactId>headerrecyclerview</artifactId>
    <version>1.0.0</version>
    <type>aar</type>
</dependency>

Do you want to contribute?

Please, do it! We'd like to improve this library with your help :)

Libraries used in this project

[Robolectric] 2
[JUnit] 3
[Picasso] 4
[Nox] 5

External resources used in this project

License

Copyright 2015 Karumi

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.

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