Flutter Firebase Notification Messeging

Question

I am trying to implement firebase_messaging in my flutter application. On Android Integration when i write native Application level code i got an error for duplicates classes but don't know why.

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

D8: Program type already present: com.project.my_project.Application com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: Learn how to resolve the issue at https://developer.android.com/studio/build/dependencies#duplicate_classes. Program type already present: com.project.my_project.Application at com.android.builder.dexing.D8DexArchiveMerger.getExceptionToRethrow(D8DexArchiveMerger.java:131) at com.android.builder.dexing.D8DexArchiveMerger.mergeDexArchives(D8DexArchiveMerger.java:118) at com.android.build.gradle.internal.transforms.DexMergerTransformCallable.call(DexMergerTransformCallable.java:102) at com.android.build.gradle.internal.tasks.DexMergingTaskRunnable.run(DexMergingTask.kt:444) ...

What went wrong: Execution failed for task ':app:mergeProjectDexDebug'.

A failure occurred while executing com.android.build.gradle.internal.tasks.Workers$ActionFacade com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: Learn how to resolve the issue at https://developer.android.com/studio/build/dependencies#duplicate_classes. Program type already present: com.project.my_project.Application <

flutter doctor [✓] Flutter (Channel stable, 1.22.3, on Mac OS X 10.15.7 19H2, locale pt-BR) • Flutter version 1.22.3 at /Users/developer/Documents/Documents/Development/flutter • Framework revision 8874f21e79 (8 days ago), 2020-10-29 14:14:35 -0700 • Engine revision a1440ca392 • Dart version 2.10.3

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2) • Android SDK at /Users/developer/Library/Android/sdk • Platform android-30, build-tools 30.0.2 • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593) • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 12.1) • Xcode at /Applications/Xcode.app/Contents/Developer • Xcode 12.1, Build version 12A7403 • CocoaPods version 1.10.0

[!] Android Studio (version 4.1) • Android Studio at /Applications/Android Studio.app/Contents ✗ Flutter plugin not installed; this adds Flutter specific functionality.(Even know it's installed working) ✗ Dart plugin not installed; this adds Dart specific functionality.(Even know it's installed and working) • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)

[✓] VS Code (version 1.50.1) • VS Code at /Applications/Visual Studio Code.app/Contents • Flutter extension version 3.16.0

[✓] Connected device (1 available) • sdk gphone x86 arm (mobile) • emulator-5554 • android-x86 • Android 11 (API 30) (emulator)

morpheus morpheus · Accepted Answer · 2020-11-06T19:25:18

This is a working example from my project. I remember stumbling into something like that. I am writing just to give a quick response, not sure if this is the correct solution.

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) {
    registry.registrarFor("io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin");
  }
}

Flutter Firebase Notification Messeging

2 Answers