Alarms.java

public static void scheduleAutoCancel(@NonNull Context context) {
        Intent intent = new Intent(context, MyReceiver.class);
        AlarmManager manager = (AlarmManager)context.getSystemService(ALARM_SERVICE);
        int requestCode = REQUEST_CODE;
        PendingIntent action = PendingIntent.getBroadcast(context, requestCode, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        long when =  System.currentTimeMillis() + TIME_TO_WAUT_UNTIL_NOTIFICATION;
        manager.set(AlarmManager.RTC, when, action);
    }
    
public static class MyReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
          NotificationManager nm = (NotificationManager) context.getSystemService(NOTIFICATION_SERVICE);
          NotificationCompat.Builder builder = new NotificationCompat.Builder(this)
          .setContentIntent(getNotificationIntent());
          .setContentText("MESSAGE")
          .setContentTitle("TITLE");
          nm.notify(builder.build(), getNotificationId());

        }
}