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

[manuuuel]

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)
    }
}

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