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

I was having the same issue and did some more digging on this. When the app is in the background, a notification message is sent to the system tray, BUT a data message is sent to onMessageReceived()
See https://firebase.google.com/docs/cloud-messaging/downstream#monitor-token-generation_3
and https://github.com/firebase/quickstart-android/blob/master/messaging/app/src/main/java/com/google/firebase/quickstart/fcm/MyFirebaseMessagingService.java

To ensure that the message you are sending, the docs say, "Use your app server and FCM server API: Set the data key only. Can be either collapsible or non-collapsible."
See https://firebase.google.com/docs/cloud-messaging/concept-options#notifications_and_data_messages