private void addActorsToGrid(final List<Actor> actors) {
   if (null == mAdapter) {
     mAdapter = new ActorsAdapter();
     mRecyclerView.setAdapter(mAdapter);
   }
   mAdapter.clear();
   mAdapter.addAll(actors);
 }
  @Override
  public void onErrorResponse(VolleyError error) {
    // Clear any previous data
    mAdapter.clear();

    // The grid was hidden, it is time to show it.
    setContentShown(true);
  }