public T lastItem(){
  if (mDataList == null || mDataList.size() == 0) {
    return null;
  }
  return mDataList.get(mDataList.size() - 1);
}

public T lastItem ( ) { if ( mDataList == null || mDataList . size ( ) == 0 ) { return null ; } return mDataList . get ( mDataList . size ( ) - 1 ) ; }
the last item in list
