AlarmManager am=(AlarmManager)getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(Display.this, TwoAlarmService.class);
PendingIntent pi = PendingIntent.getBroadcast(Display.this, AlarmNumber, intent, PendingIntent.FLAG_CANCEL_CURRENT);
am.cancel(pi);

NotificationManager notificationManager = (NotificationManager) getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.cancel(NOTIFICATION_ID);

notificationManager.cancelAll();

String ns = NOTIFICATION_SERVICE;
    NotificationManager nMgr = (NotificationManager) getActivity().getApplicationContext().getSystemService(ns);
    nMgr.cancel(NOTIFICATION_ID);
}