cookbook1-adapter.java

// ItemBinder for NewsSource
public class NewsSourceBinder extends ItemBinder<NewsSource, NewsSourceBinder.ViewHolder> {

  @Override public ViewHolder createViewHolder(ViewGroup parent) {
    return new ViewHolder(inflate(parent, R.layout.item_news_source));
  }

  @Override public void bindViewHolder(ViewHolder holder, NewsSource item) {
    holder.imageView.setImageResource(item.getIconResource());
    holder.textView.setText(item.getText());
    int bgColor = ContextCompat.getColor(holder.textView.getContext(),
        holder.isItemSelected() ? item.getColor() : R.color.cardview_light_background);
    holder.cardView.setBackgroundColor(bgColor);
    holder.cardView.setCardElevation(holder.isItemSelected() ? 16 : 0);
  }

  @Override public boolean canBindData(Object item) {
    return item instanceof NewsSource;
  }

  public static class ViewHolder extends ItemViewHolder<NewsSource> {

    private ImageView imageView;
    private TextView textView;
    private CardView cardView;

    public ViewHolder(View itemView) {
      super(itemView);

      imageView = itemView.findViewById(R.id.image_view);
      cardView = (CardView) itemView;
      textView = itemView.findViewById(R.id.text_view);
    }
  }
}

// ItemBinder for Header
public class HeaderBinder extends ItemBinder<String, HeaderBinder.ViewHolder> {

  @Override public ViewHolder createViewHolder(ViewGroup parent) {
    return new ViewHolder(inflate(parent, R.layout.item_header));
  }

  @Override public void bindViewHolder(ViewHolder holder, String item) {
    holder.header.setText(item);
  }

  @Override public boolean canBindData(Object item) {
    return item instanceof String;
  }
  
  static class ViewHolder extends ItemViewHolder<String> {

    private TextView header;

    ViewHolder(View itemView) {
      super(itemView);
      header = itemView.findViewById(R.id.tv_header);
    }
  }
}

// Create adapter
public void setUpAdapter(List<NewsSource> newsPaperSourcesList, List<NewsSource> newsChannelSourcesList) {
  MultiViewAdapter adapter = new MultiViewAdapter();
  
  // Register Binders
  adapter.registerBinders(new NewsSourceBinder(), new HeaderBinder());
  
  // NewsPaperSources
  ItemSection<String> newsPaperHeader = new ItemSection("News Papers");
  ListSection<NewsSource> newsPaperSources = new ListSection();
  newsPaperSources.addAll(newsPaperSourcesList);
  
  // NewsChannelSources
  ItemSection<String> newsChannelHeader = new ItemSection("News Channels");
  ListSection<NewsSource> newsChannelSources = new ListSection();
  newsChannelSources.addAll(newsChannelSourcesList);
  
  // Add sections to adapter
  adapter.addSection(newsPaperHeader);
  adapter.addSection(newsPaperSources);
  adapter.addSection(newsChannelHeader);
  adapter.addSection(newsChannelSources); 
}