[firebase_messaging]when application launch incase when use (onBackground:)....

[maindoliya]

E/MethodChannel#plugins.flutter.io/firebase_messaging(13851): Failed to handle method call
E/MethodChannel#plugins.flutter.io/firebase_messaging(13851): java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Intent android.app.Activity.getIntent()' on a null object reference
E/MethodChannel#plugins.flutter.io/firebase_messaging(13851): 	at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.setActivity(FlutterLocalNotificationsPlugin.java:780)
E/MethodChannel#plugins.flutter.io/firebase_messaging(13851): 	at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.registerWith(FlutterLocalNotificationsPlugin.java:116)
E/MethodChannel#plugins.flutter.io/firebase_messaging(13851): 	at io.flutter.plugins.GeneratedPluginRegistrant.registerWith(GeneratedPluginRegistrant.java:43)
E/MethodChannel#plugins.flutter.io/firebase_messaging(13851): 	at mobihub.mobihub.Application.registerWith(Application.java:19)
E/MethodChannel#plugins.flutter.io/firebase_messaging(13851): 	at io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService.startBackgroundIsolate(FlutterFirebaseMessagingService.java:164)
E/MethodChannel#plugins.flutter.io/firebase_messaging(13851): 	at io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin.onMethodCall(FirebaseMessagingPlugin.java:176)
E/MethodChannel#plugins.flutter.io/firebase_messaging(13851): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:226)
E/MethodChannel#plugins.flutter.io/firebase_messaging(13851): 	at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:85)
E/MethodChannel#plugins.flutter.io/firebase_messaging(13851): 	at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:631)
E/MethodChannel#plugins.flutter.io/firebase_messaging(13851): 	at android.os.MessageQueue.nativePollOnce(Native Method)
E/MethodChannel#plugins.flutter.io/firebase_messaging(13851): 	at android.os.MessageQueue.next(MessageQueue.java:326)
E/MethodChannel#plugins.flutter.io/firebase_messaging(13851): 	at android.os.Looper.loop(Looper.java:165)
E/MethodChannel#plugins.flutter.io/firebase_messaging(13851): 	at android.app.ActivityThread.main(ActivityThread.java:6861)
E/MethodChannel#plugins.flutter.io/firebase_messaging(13851): 	at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#plugins.flutter.io/firebase_messaging(13851): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
E/MethodChannel#plugins.flutter.io/firebase_messaging(13851): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)
E/flutter (13851): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: PlatformException(error, Attempt to invoke virtual method 'android.content.Intent android.app.Activity.getIntent()' on a null object reference, null)

This is my Application.java Class

public class Application extends FlutterApplication implements PluginRegistrantCallback {
    @Override
    public void onCreate() {
        super.onCreate();
        FlutterFirebaseMessagingService.setPluginRegistrant(this);
    }

    @Override
    public void registerWith(PluginRegistry registry) {
        GeneratedPluginRegistrant.registerWith(registry);
    }
}

This is manifest class

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="mobihub.mobihub">

    <!-- io.flutter.app.FlutterApplication is an android.app.Application that
         calls FlutterMain.startInitialization(this); in its onCreate method.
         In most cases you can leave this as-is, but you if you want to provide
         additional functionality it is fine to subclass or reimplement
         FlutterApplication and put your custom class here. -->
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

    <application android:name=".Application"
        android:label="mobihub"
        android:icon="@mipmap/ic_launcher">
        <meta-data
            android:name="com.google.firebase.messaging.default_notification_channel_id"
            android:value="@string/notification_channel_id"/>
        <activity
            android:name=".MainActivity"
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize"
            tools:ignore="Instantiatable">
            <!-- This keeps the window background of the activity showing
                 until Flutter renders its first frame. It can be removed if
                 there is no splash screen (such as the default splash screen
                 defined in @style/LaunchTheme). -->
            <meta-data
                android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
                android:value="true" />
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
            <intent-filter>
                <action android:name="FLUTTER_NOTIFICATION_CLICK" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
        <service android:name="com.google.firebase.components.ComponentDiscoveryService"
            tools:ignore="MissingClass">
            <meta-data
                android:name="com.google.firebase.components:com.google.firebase.iid.Registrar"
                android:value="com.google.firebase.components.ComponentRegistrar" />
        </service>

        <activity
            android:name="com.yalantis.ucrop.UCropActivity"
            android:screenOrientation="portrait"
            android:theme="@style/Theme.AppCompat.Light.NoActionBar"/>
    </application>
</manifest>

build.gradle

buildscript {
    repositories {
        google()
        jcenter()
    }

    dependencies {
        //noinspection GradleDependency
        classpath 'com.android.tools.build:gradle:3.5.3'
        // Add the google services classpath
       // classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.3.3'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

MainClass

void fcmConfigure() {
    _firebaseMessaging.configure(
      onMessage: (Map<String, dynamic> message) async {
        print('getting');
        print("fcmConfigure _firebaseMessaging onMessage: $message");
        print("fcmConfigure _firebaseMessaging onMessage: ${message['data']['url']}");
//        _showItemDialog(message);
        String title = message['data']['user_name'];
        String body = message['data']['message'];
         showNotification(title,body);
      //  Fluttertoast.showToast(msg: '$message', backgroundColor: Colors.red);
      },

       onBackgroundMessage: myBackgroundMessageHandler,

      onLaunch: (Map<String, dynamic> message) async {
        print("fcmConfigure _firebaseMessaging onLaunch: $message");
        Fluttertoast.showToast(msg: '$message', backgroundColor: Colors.amber);
        //_showNotificationWithDefaultSound();
        // showNotification();
//        _navigateToItemDetail(message);
      },

      onResume: (Map<String, dynamic> message) async {
        print("fcmConfigure _firebaseMessaging onResume: $message");
        Fluttertoast.showToast(msg: '$message', backgroundColor: Colors.green);
//        _navigateToItemDetail(message);
      },
    );
    permissions();
  }

  static Future<dynamic> myBackgroundMessageHandler(Map<String, dynamic> message) {
    if (message.containsKey('data')) {
      // Handle data message
      final dynamic data = message['data'];
      print('Background');
      print(data);
      _showNotification();
    }

  }

[maindoliya]

This is my Application.java Class

public class Application extends FlutterApplication implements PluginRegistrantCallback {
    @Override
    public void onCreate() {
        super.onCreate();
        FlutterFirebaseMessagingService.setPluginRegistrant(this);
    }

    @Override
    public void registerWith(PluginRegistry registry) {
        GeneratedPluginRegistrant.registerWith(registry);
    }
}

This is manifest class

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="mobihub.mobihub">

    <!-- io.flutter.app.FlutterApplication is an android.app.Application that
         calls FlutterMain.startInitialization(this); in its onCreate method.
         In most cases you can leave this as-is, but you if you want to provide
         additional functionality it is fine to subclass or reimplement
         FlutterApplication and put your custom class here. -->
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

    <application android:name=".Application"
        android:label="mobihub"
        android:icon="@mipmap/ic_launcher">
        <meta-data
            android:name="com.google.firebase.messaging.default_notification_channel_id"
            android:value="@string/notification_channel_id"/>
        <activity
            android:name=".MainActivity"
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize"
            tools:ignore="Instantiatable">
            <!-- This keeps the window background of the activity showing
                 until Flutter renders its first frame. It can be removed if
                 there is no splash screen (such as the default splash screen
                 defined in @style/LaunchTheme). -->
            <meta-data
                android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
                android:value="true" />
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
            <intent-filter>
                <action android:name="FLUTTER_NOTIFICATION_CLICK" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
        <service android:name="com.google.firebase.components.ComponentDiscoveryService"
            tools:ignore="MissingClass">
            <meta-data
                android:name="com.google.firebase.components:com.google.firebase.iid.Registrar"
                android:value="com.google.firebase.components.ComponentRegistrar" />
        </service>

        <activity
            android:name="com.yalantis.ucrop.UCropActivity"
            android:screenOrientation="portrait"
            android:theme="@style/Theme.AppCompat.Light.NoActionBar"/>
    </application>
</manifest>

build.gradle

buildscript {
    repositories {
        google()
        jcenter()
    }

    dependencies {
        //noinspection GradleDependency
        classpath 'com.android.tools.build:gradle:3.5.3'
        // Add the google services classpath
       // classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.3.3'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

MainClass

void fcmConfigure() {
    _firebaseMessaging.configure(
      onMessage: (Map<String, dynamic> message) async {
        print('getting');
        print("fcmConfigure _firebaseMessaging onMessage: $message");
        print("fcmConfigure _firebaseMessaging onMessage: ${message['data']['url']}");
//        _showItemDialog(message);
        String title = message['data']['user_name'];
        String body = message['data']['message'];
         showNotification(title,body);
      //  Fluttertoast.showToast(msg: '$message', backgroundColor: Colors.red);
      },

       onBackgroundMessage: myBackgroundMessageHandler,

      onLaunch: (Map<String, dynamic> message) async {
        print("fcmConfigure _firebaseMessaging onLaunch: $message");
        Fluttertoast.showToast(msg: '$message', backgroundColor: Colors.amber);
        //_showNotificationWithDefaultSound();
        // showNotification();
//        _navigateToItemDetail(message);
      },

      onResume: (Map<String, dynamic> message) async {
        print("fcmConfigure _firebaseMessaging onResume: $message");
        Fluttertoast.showToast(msg: '$message', backgroundColor: Colors.green);
//        _navigateToItemDetail(message);
      },
    );
    permissions();
  }

  static Future<dynamic> myBackgroundMessageHandler(Map<String, dynamic> message) {
    if (message.containsKey('data')) {
      // Handle data message
      final dynamic data = message['data'];
      print('Background');
      print(data);
      _showNotification();
    }

  }

[TahaTesser]

Hi @maindoliya
Can you please provide your flutter doctor -v, and a complete reproducible minimal code sample from main.dart without flutter_local_notifications
Thank you

[fajarainul]

@maindoliya did you found any solution?