Firebase onMessageReceived not called when app in background

Question

I\'m working with Firebase and testing sending notifications to my app from my server while the app is in the background. The notification is sent successfully, it even appe

Answer 1

The point which deserves highlighting is that you have to use data message - data key only - to get onMessageReceived handler called even when the app is in background. You shouldn't have any other notification message key in your payload, otherwise the handler won't get triggered if the app is in background.

It is mentioned (but not so emphasized in FCM documentation) here:

https://firebase.google.com/docs/cloud-messaging/concept-options#notifications_and_data_messages

Use your app server and FCM server API: Set the data key only. Can be either collapsible or non-collapsible.