[firebase_messaging] No documentation for Android v2 embedding backgroundMessage handler

[VictorUvarov]

Describe the bug
Currently the documentation does NOT support the new Flutter Android v2 embedding that came along with flutter 1.12.13. The function GeneratedPluginRegistrant.registerWith(registry); no longer accepts a io.flutter.plugin.common.PluginRegistry object, but a io.flutter.embedding.engine.FlutterEngine object.

Current code in documentation:

 import io.flutter.app.FlutterApplication;
 import io.flutter.plugin.common.PluginRegistry;
 import io.flutter.plugin.common.PluginRegistry.PluginRegistrantCallback;
 import io.flutter.plugins.GeneratedPluginRegistrant;
 import io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService;

 public class Application extends FlutterApplication implements PluginRegistrantCallback {
   @Override
   public void onCreate() {
     super.onCreate();
     FlutterFirebaseMessagingService.setPluginRegistrant(this);
   }

   @Override
   public void registerWith(PluginRegistry registry) {
     GeneratedPluginRegistrant.registerWith(registry);
   }
 }

Newer code attempt with error:

import io.flutter.app.FlutterApplication;
import io.flutter.plugin.common.PluginRegistry;
import io.flutter.plugins.GeneratedPluginRegistrant;
import io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService;

public class Application extends FlutterApplication implements PluginRegistry.PluginRegistrantCallback {
    @Override
    public void onCreate() {
        super.onCreate();
        FlutterFirebaseMessagingService.setPluginRegistrant(this);
    }

    @Override
    public void registerWith(PluginRegistry registry) {
        GeneratedPluginRegistrant.registerWith(registry); // ERROR: Expects io.flutter.embedding.engine.FlutterEngine
    }
}

To Reproduce
Steps to reproduce the behavior:

1. Run flutter create -a java example
2. Follow firebase_messaging background messaging instructions
3. Notice GeneratedPluginRegistrant.registerWith(registry) no longer expects a PluginRegistry type

[stoppiNeobiz]

any solution for this error?

[sgehrman]

same issue

[gakubhat]

Solved it with following:
app/src/build.gradle
add the following:
implementation "com.google.firebase:firebase-messaging:20.1.0"
Application.kt

import io.flutter.app.FlutterApplication
import io.flutter.plugin.common.PluginRegistry
import io.flutter.plugin.common.PluginRegistry.PluginRegistrantCallback
import io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService

class Application : FlutterApplication(), PluginRegistrantCallback {
    override fun onCreate() {
        super.onCreate()
        FlutterFirebaseMessagingService.setPluginRegistrant(this)
    }

    override fun registerWith(registry: PluginRegistry?) {
        registry?.registrarFor("io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin");
    }


}

[woprandi]

That would be better to get an official fix and not have to do a workaround with potential side effect

[woprandi]

I have another issue with the @gakubhat workaround (#116)
I followed this workaround : https://www.djamware.com/post/5e4b26e26cdeb308204b427f/flutter-tutorial-firebase-cloud-messaging-fcm-push-notification

Frustrating to have so many issues on a important plugin...

[Zazo032]

@Ehesp hi, is there any ETA for solving this?