java.lang.RuntimeException：接收 Firebase 消息传递消息时无法创建服务错误

Question

我正在设置FirebaseMessaging，当我收到消息时，我确实得到了我在.onMessage回调中设置的打印件：

I/flutter (27328): New FCM onMessage message : Instance of 'RemoteMessage' 
I/flutter (27328): 
I/flutter (27328): New FCM onMessage message id: 0:1653641357492638%dad60691dad60691
W/com.xxx.foods(27328): Accessing hidden method Landroid/os/WorkSource;->add(I)Z (unsupported,test-api, reflection, allowed)
I/flutter (27328): New FCM onMessage message sentTime: 2022-05-27 10:49:17.485
W/com.xxx.foods(27328): Accessing hidden method Landroid/os/WorkSource;->add(ILjava/lang/String;)Z (unsupported,test-api, reflection, allowed)
W/com.xxx.foods(27328): Accessing hidden method Landroid/os/WorkSource;->get(I)I (unsupported, reflection, allowed)
W/com.xxx.foods(27328): Accessing hidden method Landroid/os/WorkSource;->getName(I)Ljava/lang/String; (unsupported, reflection, allowed)
I/flutter (27328): New FCM onMessage message notification title: a
I/flutter (27328): New FCM onMessage message notification body: a

但随后应用程序崩溃并出现错误：

D/AndroidRuntime(27328): Shutting down VM E/AndroidRuntime(27328): FATAL EXCEPTION: main E/AndroidRuntime(27328): Process: com.xxx.foods, PID: 27328 E/AndroidRuntime(27328): java.lang.RuntimeException: Unable to create service com.example.xxx.java.MyFirebaseMessagingService: java.lang.ClassNotFoundException: Didn't find class "com.example.xxx.java.MyFirebaseMessagingService" on path: DexPathList[[zip file "/data/app/~~LYrL5kv915DhEfzUSgPwZg==/com.xxx.foods-dIN5_0rsX6Wo-G0jfKtL2Q==/base.apk"],nativeLibraryDirectories=[/data/app/~~LYrL5kv915DhEfzUSgPwZg==/com.xxx.foods-dIN5_0rsX6Wo-G0jfKtL2Q==/lib/arm64, /data/app/~~LYrL5kv915DhEfzUSgPwZg==/com.xxx.foods-dIN5_0rsX6Wo-G0jfKtL2Q==/base.apk!/lib/arm64-v8a, /system/lib64, /system_ext/lib64]] E/AndroidRuntime(27328):  at android.app.ActivityThread.handleCreateService(ActivityThread.java:4619) E/AndroidRuntime(27328):    at android.app.ActivityThread.access$1800(ActivityThread.java:265) E/AndroidRuntime(27328):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2122) E/AndroidRuntime(27328):    at android.os.Handler.dispatchMessage(Handler.java:106) E/AndroidRuntime(27328):    at android.os.Looper.loopOnce(Looper.java:210) E/AndroidRuntime(27328):     at android.os.Looper.loop(Looper.java:299) E/AndroidRuntime(27328):     at android.app.ActivityThread.main(ActivityThread.java:8166) E/AndroidRuntime(27328):   at java.lang.reflect.Method.invoke(Native Method) E/AndroidRuntime(27328):  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556) E/AndroidRuntime(27328):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1037) E/AndroidRuntime(27328): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.xxx.java.MyFirebaseMessagingService" on path: DexPathList[[zip file "/data/app/~~LYrL5kv915DhEfzUSgPwZg==/com.xxx.foods-dIN5_0rsX6Wo-G0jfKtL2Q==/base.apk"],nativeLibraryDirectories=[/data/app/~~LYrL5kv915DhEfzUSgPwZg==/com.xxx.foods-dIN5_0rsX6Wo-G0jfKtL2Q==/lib/arm64, /data/app/~~LYrL5kv915DhEfzUSgPwZg==/com.xxx.foods-dIN5_0rsX6Wo-G0jfKtL2Q==/base.apk!/lib/arm64-v8a, /system/lib64, /system_ext/lib64]] E/AndroidRuntime(27328):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:218) E/AndroidRuntime(27328):     at java.lang.ClassLoader.loadClass(ClassLoader.java:379) E/AndroidRuntime(27328):   at java.lang.ClassLoader.loadClass(ClassLoader.java:312) E/AndroidRuntime(27328):   at android.app.AppComponentFactory.instantiateService(AppComponentFactory.java:129) E/AndroidRuntime(27328):    at androidx.core.app.CoreComponentFactory.instantiateService(CoreComponentFactory.java:75) E/AndroidRuntime(27328):     at android.app.ActivityThread.handleCreateService(ActivityThread.java:4588) E/AndroidRuntime(27328):    ... 9 more D/OOMEventManagerFK(27328): checkEventAndDumpForJE: 0 I/Process (27328): Sending signal. PID: 27328 SIG: 9 Lost connection to device

在我的 android/app/main/AndroidManifest.xml 中，我按照文档中的描述设置了一个服务：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.xxx">
    <!-- 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.ACCESS_NETWORK_STATE" />

    <application
        android:name="io.flutter.app.FlutterApplication"
        android:label="xxx"
        android:icon="@mipmap/ic_launcher">

        <activity
            android:name=".MainActivity"
            android:exported="true"
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize">
            <!-- Specifies an Android theme to apply to this Activity as soon as
                 the Android process has started. This theme is visible to the user
                 while the Flutter UI initializes. After that, this theme continues
                 to determine the Window background behind the Flutter UI. -->
            <meta-data
              android:name="io.flutter.embedding.android.NormalTheme"
              android:resource="@style/NormalTheme"
              />
            <!-- Displays an Android View that continues showing the launch screen
                 Drawable until Flutter paints its first frame, then this tutorial
                 screen fades out. A tutorial screen is useful to avoid any visual
                 gap between the end of Android's launch screen and the painting of
                 Flutter's first frame. -->
            <meta-data
              android:name="io.flutter.embedding.android.SplashScreenDrawable"
              android:resource="@drawable/launch_background"
              />
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
        <service
            android:name=".java.MyFirebaseMessagingService"
            android:exported="false">
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT" />
            </intent-filter>
        </service>

        <!-- Don't delete the meta-data below.
             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
        <meta-data
            android:name="flutterEmbedding"
            android:value="2" />
    </application>
</manifest>

在MainActivity.kt我设置 FlutterFragmentedActivity 中：

package com.example.xxx

//import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.android.FlutterFragmentActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugins.GeneratedPluginRegistrant
import androidx.annotation.NonNull;

//class MainActivity: FlutterActivity() {
//}
class MainActivity: FlutterFragmentActivity() {
    override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
        GeneratedPluginRegistrant.registerWith(flutterEngine);
    }
}

我还应该设置什么吗？

我像这样初始化它：

  print('New FCM firebaseMessagingBackgroundHandler message : ${message.toString()} \n\n');
  print('New FCM firebaseMessagingBackgroundHandler message id: ${message.messageId}');
  print('New FCM firebaseMessagingBackgroundHandler message sentTime: ${message.sentTime}');

  print('New FCM firebaseMessagingBackgroundHandler message notification title: ${message.notification.title}');
  print('New FCM firebaseMessagingBackgroundHandler message notification body: ${message.notification.body}');
  await Firebase.initializeApp();
}

void main() async {
  // set the publishable key for Stripe - this is mandatory
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  FirebaseMessaging.onBackgroundMessage(firebaseMessagingBackgroundHandler);

...

但是，由于我需要在接收消息时发送 Bloc 事件，因此我在下一个屏幕中设置 FirebaseMessaging，该屏幕将在树中提供 Bloc：

class _ShowSplashScreenWidgetState extends State<ShowSplashScreenWidget> {
  final FirebaseMessaging _firebaseMessaging = FirebaseMessaging.instance;
  String fcmToken;

  @override
  void initState() {
    super.initState();

    /// FCM setup

    _firebaseMessaging.requestPermission(sound: true, badge: true, alert: true, provisional: false, carPlay: false, criticalAlert: false);

    _firebaseMessaging.getToken().then((token) {
      print(' _firebaseMessaging.getToken token: $token');

      if (mounted) {
        setState(() {
          fcmToken = token;
        });
      } else {
        fcmToken = token;
      }
    });

    FirebaseMessaging.onMessage.listen((message) {
      print('New FCM onMessage message : ${message.toString()} \n\n');
      print('New FCM onMessage message id: ${message.messageId}');
      print('New FCM onMessage message sentTime: ${message.sentTime}');

      print('New FCM onMessage message notification title: ${message.notification.title}');
      print('New FCM onMessage message notification body: ${message.notification.body}');

      NotificationModel notification = NotificationModel(
          id: message.messageId, read: false, date: message.sentTime, title: message.notification.title, body: message.notification.body);
      // BlocProvider.of<NotificationBloc>(context).add(SaveNotification(notification: notification));
    });

    FirebaseMessaging.onMessageOpenedApp.listen((message) {
      print('New FCM onMessageOpenedApp message : ${message.toString()} \n\n');
      print('New FCM onMessageOpenedApp message id: ${message.messageId}');
      print('New FCM onMessageOpenedApp message sentTime: ${message.sentTime}');

      print('New FCM onMessageOpenedApp message notification title: ${message.notification.title}');
      print('New FCM onMessageOpenedApp message notification body: ${message.notification.body}');
      NotificationModel notification = NotificationModel(
          id: message.messageId, read: false, date: message.sentTime, title: message.notification.title, body: message.notification.body);
      BlocProvider.of<NotificationBloc>(context).add(SaveNotification(notification: notification));
    });

....

Answer 1

你有课吗java.MyFirebaseMessagingService？另外，在较新版本的 FCM 中，您不必在清单或代码中初始化服务类，简单地说，MyFirebaseMessagingService从 AndroidManifest.xml 中删除服务标记