Android XRecyclerView最简单的item点击事件处理

/**
 * A ViewHolder describes an item view and  data about its place within the RecyclerView.
 *
 * <p>{@  Adapter} implementations should subclass ViewHolder and add fields for caching
 * potentially expensive {@  View#findViewById(int)} results.</p>
 *
 * <p>While {@  LayoutParams} belong to the {@  LayoutManager},
 * {@  ViewHolder ViewHolders} belong to the adapter. Adapters should feel free to use
 * their own custom ViewHolder implementations to store data that makes binding view contents
 * easier. Implementations should assume that individual item views will hold strong references
 * to <code>ViewHolder</code>  s and that <code>RecyclerView</code> instances may hold
 * strong references to extra off-screen item views for caching purposes</p>
 */
public static abstract class ViewHolder {
  public final View itemView;

  .......

  public ViewHolder(View itemView) {
    if (itemView == null) {
      throw new IllegalArgumentException(\"itemView may not be null\");
    }
    this.itemView = itemView;
  }

  .......
}

public class XRViewHolder extends RecyclerView.ViewHolder {
  public XRViewHolder(View view) {
    super(view);
    ButterKnife.bind(this, view);
  }
  .......
  public void onBindViewHolder(VH holder, final int position) {
    if (position >= 0) {
      holder.itemView.set Listener(new  Listener() {
        @Override
        public void  (View v) {
          itemClick(getItem(position), position);
        }
      });
    }
  }
}

public class XRecyclerView extends RecyclerView {

 private WrapAdapter mWrapAdapter;
 ......

 public void addHeaderView(View view) {
  sHeaderTypes.add(HEADER_INIT_INDEX + mHeaderViews.size());
  mHeaderViews.add(view);
  if (mWrapAdapter != null) {
    mWrapAdapter.notifyDataSetChanged();
  }
 }

 ......
 private class WrapAdapter extends RecyclerView.Adapter<ViewHolder> {

 @Override
 public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
   if (viewType == TYPE_REFRESH_HEADER) {
     return new SimpleViewHolder(mRefreshHeader);
   } else if (isHeaderType(viewType)) {
     return new SimpleViewHolder(getHeaderViewByType(viewType));
   } else if (viewType == TYPE_FOOTER) {
     return new SimpleViewHolder(mFootView);
   }
   return adapter.onCreateViewHolder(parent, viewType);
 }
}