Not receiving Firebase cloud push notifications in Android app

Question

I am not receiving push notification for my app. I have included the manifest files, the MainActivity file, the MyFireBaseMessagingService file and the build.gradle file and

Answer 1

I've had a similar issue. I've tried everything - in my opinion the main reason is that all the services are, sooner or later, being killed by the system. The only way is to make sure to deliver the notification to the system tray not to the application. To do that you need to use Data message notifications.

There are 2 types of FCM notifications: Notification message and Data message.

Data messages are delivered to system tray and are always display - even if service is not running.

Notification message looks like:

{
  "message":{
    "token":"bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...",
    "notification":{
      "title":"Portugal vs. Denmark",
      "body":"great match!"
    }
  }
}

and triggers method OnMessageReceaved() of FirebaseMessagingService. Many devices (especially Huawei and Xiaomi) try to do everything to kill background services to prevent battery drain. So the FirebaseMessagingService isn't the best way to handle notifications.

Second type is Data message:

{
  "message":{
    "token":"bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...",
    "data":{
      "Nick" : "Mario",
      "body" : "great match!",
      "Room" : "PortugalVSDenmark"
    }
  }
}

This type is handled by the system tray, so you don't need any of service running to get the notification. Its much more convenient method, but as far i know, it can't be achieved with the console.

You would probably need server API to send Data message.

Read this for more details.