[Android] How to create notifications, even when the app is closed.(2)

[REFERENCE LINK] https://forum.processing.org/two/discussion/4429/notifications-in-android-mode https://forum.processing.org/two/discussion/16840/how-to-create-notifications-even-when-the-app-is-closed

How to create notifications, even when the app is closed.

Is it impossible with the Processing(android mode) program?

https://developer.android.com/guide/topics/ui/notifiers/notifications.html#CreateNotification

[EXAM]

import android.view.MotionEvent; 
import android.content.Context;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.Activity;

Activity act;
NotificationManager gNotificationManager;
Notification gNotification;
long[] gVibrate = {0,250,50,125,50,62};
Context ctx;

void setup() {
  size(displayWidth, displayHeight);


}

void draw() {

}


void onResume() {
  super.onResume();
  // Create our Notification Manager:
  gNotificationManager = (NotificationManager) this.getActivity().getSystemService(Context.NOTIFICATION_SERVICE);
  // Create our Notification that will do the vibration:
  gNotification = new Notification();
  // Set the vibration:
  gNotification.vibrate = gVibrate;
}

public boolean surfaceTouchEvent(MotionEvent event) {
  // If user touches the screen, trigger vibration notification:
  gNotificationManager.notify(1, gNotification);
  return super.surfaceTouchEvent(event);
}

It does not work.