FCM for android: popup system notification when app is in background

Question

Is it possible to show popup for firebase system notification (when app is in background) on the top of screen? I use setPriority(Notification.PRIORITY_MAX) for

Answer 1

It is only possible to handle the message in onMessageReceived when your app is in background when using a data only payload.

When using both notification and data in your payload, the expected behavior is that the Android System will handle the notification when the app is in background, regardless of what is the value of your priority.

See the official docs on Handling Android Messages for more details.