A demo Flutter application for Firebase Cloud Messaging (Firebse push notification0

Clone this repository locally. The folder structure is somewhat based on clean code architecture

How to implement firebase in you project:

1. Create flutter project

2. Create project in firebase console.

   To get sh1 key go to java/jdk/bin & run this cmnd in cmd:

   keytool -list -v -keystore "%USERPROFILE%\.android\debug.keystore" -alias androiddebugkey storepass android -keypass android

   or check this post for other easier way to get SH1 Key

3. In android/app -> add google-service.json (Get this file from firebase console -To get this file register your app in firebase console here)

4. In pubspec.yaml

   add,

      flutter_test:
        sdk: flutter
      firebase_messaging: ^6.0.13
      firebase_analytics: ^5.0.11 #optional
   

5. add Application.kt in android/app/src/main/kotlin/com/yourdomain/appname/

   Application.kt (ignore the error)

   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
   //import com.google.firebase.messaging.FirebaseMessagingService
   
   class Application : FlutterApplication() , PluginRegistrantCallback {
   
       override fun onCreate() {
           super.onCreate();
           FlutterFirebaseMessagingService.setPluginRegistrant(this);
       }
   
      override fun registerWith( registry: PluginRegistry) {
           GeneratedPluginRegistrant.registerWith(registry);
       }
   }
   

   if error occurred, replace GeneratedPluginRegistrant.registerWith(registry);

with,

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

6. In src/main/manifest, in <application/> tag

   replace/add,

       android:name=".Application"
   

   Inside <activity/> tag (below existing intent filter tag)

   add,

    <activity        
       <intent-filter>
           <action android:name="FLUTTER_NOTIFICATION_CLICK" />
           <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
   

7. In app/build.gradle

   add,

   implementation 'com.google.firebase:firebase-messaging:20.1.5' apply plugin: 'com.google.gms.google-services' addd this at the bottom

8. In android/build.gradle

   add,

       classpath 'com.google.gms:google-services:4.3.3'
   

9. To get token and suscribe to a topic use following code in your main.dart:

   main.dart

   import 'package:firebase_messaging/firebase_messaging.dart';
    final FirebaseMessaging _messaging = FirebaseMessaging();
    @override
     void initState() {
       super.initState();
       _messaging.subscribeToTopic("general");
       _messaging.getToken().then((token) {
        print(token);
       });
      } 
   

10. run flutter clean/ re-install app/ invalidate cache and restart android studio

11. enjoy.

For more help Read official documentation Here