@Override
 public boolean onRVItemLongClick(View v, int position) {
   showToast("长按了条目 " + mAdapter.getItem(position).desc);
   return true;
 }
 @Override
 public void onRVItemClick(View v, int position) {
   showToast("点击了条目 " + mAdapter.getItem(position).desc);
 }