Solvedflutterfire [firebase_messaging] Application.kt: Type mismatch: inferred type is PluginRegistry but FlutterEngine was expected

Problem

customerApplication/android/app/src/main/kotlin/com/application/customerApplication/Application.kt: (17, 48): Type mismatch: inferred type is PluginRegistry but FlutterEngine was expected
 
FAILURE: Build failed with an exception.
 
* What went wrong:
Execution failed for task ':app:compileDebugKotlin'.
> Compilation error. See log for more details
 
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
 
* Get more help at https://help.gradle.org
 
BUILD FAILED in 12s
Finished with error: Gradle task assembleDebug failed with exit code 1

I'm using the master repo version of firebase_messaging and I also done the fix suggested in last README.md.

My environment

[✓] Flutter (Channel stable, v1.12.13+hotfix.5, on Mac OS X 10.15.1 19B88, locale it-IT)
    • Flutter version 1.12.13+hotfix.5 at /Users/user/flutter
    • Framework revision 27321ebbad (9 days ago), 2019-12-10 18:15:01 -0800
    • Engine revision 2994f7e1e6
    • Dart version 2.7.0
 
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at /Users/user/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-29, build-tools 29.0.2
    • ANDROID_HOME = /Users/user/Library/Android/sdk
    • ANDROID_SDK_ROOT = /Users/user/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
    • All Android licenses accepted.
 
[✓] Xcode - develop for iOS and macOS (Xcode 11.3)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.3, Build version 11C29
    • CocoaPods version 1.8.4
 
[✓] Android Studio (version 3.5)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 42.1.1
    • Dart plugin version 191.8593
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
 
[✓] VS Code (version 1.41.0)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.7.1
 
[✓] Connected device (1 available)
    • AOSP on IA Emulator • emulator-5554 • android-x86 • Android 9 (API 28) (emulator)

• No issues found!

Code:

MainActivity.kt

package com.application.customerApplication
 
import androidx.annotation.NonNull
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugins.GeneratedPluginRegistrant
 
class MainActivity: FlutterActivity() {
    override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
        GeneratedPluginRegistrant.registerWith(flutterEngine)
    }
}
 

Application.kt

package com.application.customerApplication
 
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
 
class Application : FlutterApplication(), PluginRegistrantCallback {
 
    override fun onCreate() {
        super.onCreate()
        FlutterFirebaseMessagingService.setPluginRegistrant(this)
    }
 
    override fun registerWith(registry: PluginRegistry) {
        GeneratedPluginRegistrant.registerWith(registry)
    }
}
44 Answers

✔️Accepted Answer

There is a workaround mentioned in: #1613

Replace:

 override fun registerWith(registry: PluginRegistry?) {
        GeneratedPluginRegistrant.registerWith(registry) //Error thrown here
    }

To:

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

Also temporary downgrade firebase_messaging to 5.1.6

  firebase_messaging: ^5.1.6

The build crash is solved. Don't know if "background messaging" works. If someone can confirm that?

Other Answers:

+1 same problem here!

I had the same problem in Application.kt:

package com.application.customerApplication

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

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

To solve the problem I now use in Application.tk:

package com.application.customerApplication

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");
    }
}

I found this solution in here.

But there are still problems in background notifications, like:

E/flutter (22439): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: MissingPluginException(No implementation found for method FcmDartService#initialized on channel plugins.flutter.io/firebase_messaging_background)

I have been struggling with this issue for the last 4 days. To say that this is a massive issue is an understatement. Its making this plugin in android completely unusable for what I'm doing. The version I've been trying to get working is version 6.0.9. It's the latest version. If you need more information on this issue I'll be happy to provide it to you. Please let me know. It's kind of urgent I get this working. And the trouble is I have other plugins I am using and If I break flutters plugin system to get this plugin working it kind of defeats the benefit.

I'm having the same issue with my Application.kt file after upgrading to Flutter v1.12.13 and firebase_message v6.0.9.

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