final int ID_LED=19871103;
        NotificationManager nm=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);

        Notification notification = new Notification();
        notification.ledARGB = 0xFFFFFF;  //這里是顏色，我們可以嘗試改變，理論上0xFF0000是紅色，0x00FF00是綠色
        notification.ledOnMS = 100;
        notification.ledOffMS = 100;
        notification.flags = Notification.FLAG_SHOW_LIGHTS;
        nm.notify(ID_LED, notification);
        nm.cancel(ID_LED);