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Multiple Notifications Handling Set the unique id to let Notification Manager knows this is a another notification instead of same notification. If you use the same unique Id for each notification, the Notification Manager will assume that is same notification and would replace the previous notification.

Beginning with Android 5.0, notifications can briefly appear in a floating window called a heads-up notification. This behavior is normally for important notifications that the user needs to know about immediately, and it only appears if the device is unlocked.

Set a group summary Create a new notification with a description of the group?often best done with the inbox-style notification. Add the summary notification to the group by calling setGroup() . Specify that it must be used as the group summary by calling setGroupSummary(true) .

Create a notification channel Construct a NotificationChannel object with a unique channel ID, user-visible name, and importance level. Optionally, specify the description that the user sees in the system settings with setDescription() . Register the notification channel by passing it to createNotificationChannel() .

Option 1: In your Settings app Open your phone's Settings app. Tap Apps & notifications. Notifications. Under ?Recently Sent,? tap an app. Tap a type of notification. Choose your options: Choose Alerting or Silent. To see a banner for alerting notifications when your phone is unlocked, turn on Pop on screen.

Its a numeric id that you get to define. If you later want to change this notification, you can specify the same notification id and it will change the original notification (or cancel it if you want) rather than create a new one.

// notificationId is a unique int for each notification that you must define. notificationManager.notify(notificationId, builder.build()); Save the notification ID that you pass to NotificationManagerCompat.notify() , because you need it when you want to update or remove the notification.