public static void removeLifecycleListener(LifecycleListener l){
  if (listeners == null) {
    return;
  }
  listeners.remove(l);
  if (listeners.isEmpty()) {
    listeners=null;
  }
}

public static void removeLifecycleListener ( LifecycleListener l ) { if ( listeners == null ) { return ; } listeners . remove ( l ) ; if ( listeners . isEmpty ( ) ) { listeners = null ; } }
releases the callback to lifecycle events
