Application.kt: Unresolved reference: firebasemessaging

Question

I am trying to update firebase_messaging to the new version 8.0.0-dev.10.

However, I am getting these errors:

Running Gradle task 'assembleDebug'...
Application.kt: (5, 27): Unresolved reference: firebasemessaging
Application.kt: (6, 27): Unresolved reference: firebasemessaging
Application.kt: (11, 9): Unresolved reference: FlutterFirebaseMessagingService
Application.kt: (15, 9): Unresolved reference: FirebaseMessagingPlugin

This is what my Application.kt looks like

package com.example.opengames

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

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

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

Any ideas?

Answer 1

If Your Flutter Version >= 1.12, then just delete Application.kt and FirebaseCloudMessagingPluginRegistrant.kt if exist. As these additional steps are not required anymore in android. then run

flutter clean 

flutter run

Answer 2

You can fix it as follows, create the Application.kt file

package com.example.YOUR.PACKAGE

import io.flutter.app.FlutterApplication
import io.flutter.plugin.common.PluginRegistry

import io.flutter.plugins.firebase.messaging.FlutterFirebaseMessagingPlugin

class Application() : FlutterApplication(), PluginRegistry.PluginRegistrantCallback {
  override fun registerWith(registry: PluginRegistry?) {
      val key: String? = FlutterFirebaseMessagingPlugin::class.java.canonicalName
      if (!registry?.hasPlugin(key)!!) {
          FlutterFirebaseMessagingPlugin.registerWith(registry?.registrarFor("io.flutter.plugins.firebase.messaging.FlutterFirebaseMessagingPlugin"));
        }
    }
}

and in your Manifest change to:

 <application
        android:label="El Chaski Customer"
        android:name=".Application"
        android:icon="@mipmap/launcher_icon">
        <activity
            android:name=".MainActivity"
            android:launchMode="singleTop"
......

Answer 3

From official documentation

https://firebase.flutter.dev/docs/messaging/overview#3-android-integration

According to this, if you are using Flutter version 1.12 and high, you require no additional integration inside application.kt. it works out of the box.