单击通知后，通知不会取消

Question

我在设备处于后台时发送通知。通知正在向移动用户发送。但点击通知后它没有取消。仍显示在状态栏中。我将此用于iBeacon发送通知。但我认为，我需要检查deivce是foregraound还是background.If它的前景我们必须取消通知。如果背景我们需要发送通知。我们怎么检查这个？

 Intent notifyIntent = new Intent(NotifyDemoActivity.this, NotifyDemoActivity.class);
    notifyIntent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);

    PendingIntent pendingIntent = PendingIntent.getActivities(
        NotifyDemoActivity.this,
        0,
        new Intent[]{notifyIntent},
        PendingIntent.FLAG_UPDATE_CURRENT);


   // Intent showIntent = new Intent(this, NotifyDemoActivity.class);
   // PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, showIntent, 0);

    Notification notification = new Notification.Builder(NotifyDemoActivity.this)
        .setSmallIcon(R.drawable.beacon_gray)
        .setContentTitle("Welcome")
        .setContentText(msg)
        .setAutoCancel(true)
        .setContentIntent(pendingIntent)
        .build();
    notification.defaults |= Notification.DEFAULT_SOUND;
    notification.defaults |= Notification.DEFAULT_LIGHTS;
    notification.flags |= Notification.FLAG_AUTO_CANCEL;
    notificationManager.notify(NOTIFICATION_ID, notification);