public final class Article {

    private int id;
    private String title;
    private String text;
    private String imageUrl;

    public Article() {
    	this.id = -1;
    	this.title = "";
    	this.text = "";
    	this.imageUrl = "";
    }

    // Setters and Getters...

    public final boolean hasImage() {
    	return !TextUtils.isEmpty(this.imageUrl);
    }

}

public final class ArticleItem extends BaseItem<Article, ArticleItem.ViewHolder, ItemResources> implements Trackable<Integer> {

    public ArticleItem(Article itemModel) {
        super(itemModel);
    }

    @Override
    public ViewHolder init(Adapter<? extends Item> adapter,
                           ViewGroup parent,
                           LayoutInflater inflater,
                           ItemResources resources) {
          // inflate (or create) your item view here and create a corresponding ViewHolder
          // then return the created ViewHolder
    }

    @Override
    public void bind(Adapter<? extends Item> adapter,
                     ViewHolder viewHolder,
                     ItemResources resources) {
        super.bind(adapter, viewHolder, resources);

        // bind the data here
        // (use the itemModel associated with this item to access the data)
    }
    
    @Override
    public int getLayout() {
        // return a unique id, which will be used as a View Type for this item
        // (you can use the item view layout id if this item's view is not going
        // to be modified dynamically by adding new views to it, otherwise you will
        // have to compose your own id to properly distinguish the item's view within your adapter)
        return R.layout.article_item_layout;
    }

    @Override
    public int getTrackKey() {
        // use the model's unique id to prevent the duplicates within the Adapter
        // (this step is optional and is enabled by the implementation of the Trackable<KeyType> interface)
        return getItemModel().getId();
    }

    public static class ViewHolder extends BaseItem.ViewHolder<Article> {

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

            // look up (or initialize) your views here...
        }

    }

}

public final class ArticlesRecyclerViewAdapter extends TrackableRecyclerViewAdapter<Long, ArticleItem, ArticleItem.ViewHolder> {

    private OnItemClickListener<ArticleItem> onArticleItemClickListener;

    public ArticlesRecyclerViewAdapter(Context context, List<ArticleItem> items) {
        super(context, items);
        setHasStableIds(true);
    }

    @Override
    public void assignListeners(ArticleItem.ViewHolder holder, int position, ArticleItem item) {
        super.assignListeners(holder, position, item);

        item.setOnItemClickListener(holder, onArticleItemClickListener);
    }

    public final void setOnItemClickListener(OnItemClickListener<ArticleItem> onArticleItemClickListener) {
        this.onArticleItemClickListener = onArticleItemClickListener;
    }

}

//...
private List<ArticleItem> items = new ArrayList<>();
private RecyclerView recyclerView;
private ArticlesRecyclerViewAdapter adapter;

//...
private void initRecyclerView() {
    //....
    recyclerView = findViewById(R.id.recyclerView);

    //...
    adapter = new ArticlesRecyclerViewAdapter(this, items);
    adpater.setOnArticleItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClicked(View view, ArticleItem item, int position) {
            // handle the article item click
        }
    });

    //...
    recyclerView.setAdapter(adapter);
}

public final class ArticlesListViewAdapter extends TrackableListViewAdapter<Long, ArticleItem, ArticleItem.ViewHolder> {

    private OnItemClickListener<ArticleItem> onItemClickListener;

    public ArticlesListViewAdapter(Context context, List<ArticleItem> items) {
        super(context, items);
        setHasStableIds(true);
    }

    @Override
    public void assignListeners(ArticleItem.ViewHolder holder, int position, ArticleItem item) {
        super.assignListeners(holder, position, item);

        item.setOnItemClickListener(holder, onItemClickListener);
    }

    public final void setOnItemClickListener(OnItemClickListener<ArticleItem> onItemClickListener) {
        this.onItemClickListener = onItemClickListener;
    }

}

public final class TopicItem extends BaseItem<Topic, TopicItem.ViewHolder, ItemResources> implements
        Header<BaseItem.ViewHolder> {

    public TopicItem(Topic itemModel) {
        super(itemModel);
    }

    @Override
    public ViewHolder init(Adapter<? extends Item> adapter,
                           ViewGroup parent,
                           LayoutInflater inflater,
                           ItemResources resources) {
        return new ViewHolder(inflater.inflate(
            getLayout(),
            parent,
            false
        ));
    }

    @Override
    public void bind(Adapter<? extends Item> adapter,
                     ViewHolder viewHolder,
                     ItemResources resources) {
        super.bind(adapter, viewHolder, resources);

        viewHolder.nameTv.setText(getItemModel().getName());

        Picasso.with(viewHolder.imageIv.getContext().getApplicationContext())
            .load(getItemModel().getImageUrl())
            .into(viewHolder.imageIv);
    }

    @Override
    public void setOnItemClickListener(BaseItem.ViewHolder viewHolder, OnItemClickListener<Header<BaseItem.ViewHolder>> onItemClickListener) {
        viewHolder.itemView.setOnClickListener(new ItemClickListener(this, 0, onItemClickListener));
    }

    @Override
    public int getLayout() {
        return R.layout.topic_item_layout;
    }

    public static final class ViewHolder extends BaseItem.ViewHolder<Topic> {

        ImageView imageIv;
        TextView nameTv;

        public ViewHolder(View itemView) {
            super(itemView);
            imageIv = itemView.findViewById(R.id.imageIv);
            nameTv = itemView.findViewById(R.id.nameTv);
        }

    }

}

public final class SimpleRecyclerViewAdapter extends TrackableRecyclerViewAdapter<Long, BaseItem, BaseItem.ViewHolder> {

    private OnItemClickListener<ArticleItem> onArticleItemClickListener;
    private OnItemClickListener<TopicSuggestionItem> onTopicSuggestionItemClickListener;
    private OnItemLongClickListener<TopicSuggestionItem> onTopicSuggestionItemLongClickListener;
    private OnItemClickListener<FooterItem> onFooterButtonClickListener;

    public SimpleRecyclerViewAdapter(Context context, List<BaseItem> items) {
        super(context, items);
        setHasStableIds(true);
    }

    @Override
    public void assignListeners(BaseItem.ViewHolder holder, int position, BaseItem item) {
        super.assignListeners(holder, position, item);
		
		if(item instanceof ArticleItem) {
			((ArticleItem) item).setOnItemClickListener(((ArticleItem.ViewHolder) holder), onArticleItemClickListener);
		} else if(item instanceof FooterItem) {
			((FooterItem) item).setOnButtonClickListener(((FooterItem.ViewHolder) holder), onFooterButtonClickListener);
		}
    }

    // Listener setters...

}