Notification using setGroupSummary (true) does not appear in Android N

Question

I tried to show 3 notifications in cluster format. According to the document, I added the setGroupSummary (true) property for the first notification. But as a result, I have only two notifications. The notification to which the GroupSummary property is added is not displayed.

NotificationCompat.Builder firstNotification = createNotification(context,"1.Message","Here you go 1"); firstNotification .setGroupSummary(true); firstNotification .setGroup("KEY_NOTIFICATION_GROUP"); NotificationCompat.Builder secondNotifi = createNotification(context,"2.Message","Here you go 2"); secondNotifi .setGroup("KEY_NOTIFICATION_GROUP"); NotificationCompat.Builder thirdNotifi= createNotification(context,"3.Message","Here you go 3"); thirdNotifi.setGroup("KEY_NOTIFICATION_GROUP"); 

Here's the notification trigger,

 notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE); notificationManager.notify(0,firstNotification .build()); notificationManager.notify(1,secondNotifi .build()); notificationManager.notify(2,thirdNotifi.build()); 

And the result:

I want to show all three notifications in cluster format without gaps.

Any help would be really appreciated.

Answer 1

You should check the following answer: setgroup () in the notification does not work

You need to create a separate group notification and set the summary group flag just for this, and this will become the parent notification that associates other notifications with the same group key within itself.

Answer 2

Android 7 decides on a summary notification. Thus, you want to see it if the system does not decide that it should be displayed.

Solution: Create a custom summary notification.