public void removeDrawerListener(@NonNull DrawerListener listener){
  if (listener == null) {
    return;
  }
  if (mListeners == null) {
    return;
  }
  mListeners.remove(listener);
}

public void removeDrawerListener ( @ NonNull DrawerListener listener ) { if ( listener == null ) { return ; } if ( mListeners == null ) { return ; } mListeners . remove ( listener ) ; }
removes the specified listener from the list of listeners that will be notified of drawer events .
