public void clearSelectedPositions(){
  mSelectedItems.clear();
  mAdapter.notifyDataSetChanged();
  setMode(MODE_SINGLE_SELECT);
}

public void clearSelectedPositions ( ) { mSelectedItems . clear ( ) ; mAdapter . notifyDataSetChanged ( ) ; setMode ( MODE_SINGLE_SELECT ) ; }
clears the information about which items are selected . should be called when we are done selecting items ( e . g . if action is taken or selection is cancelled )
