Recycler View Utils

BaseRecyclerViewAdapter.java

/**
 * A general RecyclerViewAdapter which supports OnItemClickListener and OnItemLongClickListener.
 *
 */
public abstract class BaseRecyclerViewAdapter<VH extends RecyclerView.ViewHolder> extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

  private RecyclerViewListener.OnItemClickListener itemClickListener;
  private RecyclerViewListener.OnItemLongClickListener itemLongClickListener;

  public void setOnItemClickListener(
      @NonNull RecyclerViewListener.OnItemClickListener itemClickListener) {
    this.itemClickListener = itemClickListener;
  }

  public void setOnItemLongClickListener(
      @NonNull RecyclerViewListener.OnItemLongClickListener itemLongClickListener) {
    this.itemLongClickListener = itemLongClickListener;
  }

  /**
   * Override onBindViewHolder to support OnItemClick and OnItemLongClick listener.
   */
  @Override
  public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int i) {
      if (itemClickListener != null) {
        viewHolder.itemView.setOnClickListener(view -> itemClickListener.OnItemClick(view, i));
      }
      if (itemLongClickListener != null) {
        viewHolder.itemView.setOnLongClickListener(view -> {
          itemLongClickListener.OnItemLongClick(view, i);
          return true;
        });
      }
  }
}

RecyclerViewListener.java

public interface RecyclerViewListener {

  @FunctionalInterface 
  interface OnItemClickListener {
    void OnItemClick(View view, int position);
  }

  @FunctionalInterface 
  interface OnItemLongClickListener {
    void OnItemLongClick(View view, int position);
  }
}