如何修复在接收基于 Flutter 构建的 FCM 推送通知时的应用程序崩溃

Question

我在 Flutter 上构建了一个应用程序，并尝试通过 FCM 发送推送通知。早些时候它可以工作，但是在更改Firebase消息传递的版本后，一旦我发送推送通知，应用程序就会崩溃。

我没有对代码本身进行任何更改。我调查了GitHub问题，但无法解决。

这是我在main.dart文件中使用的代码。

final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
  void initState() {
    super.initState();
    _firebaseMessaging.configure(
      onMessage: (Map<String, dynamic> message) {
        print('on message $message');
      },
      onResume: (Map<String, dynamic> message) {
        print('on resume $message');
      },
      onLaunch: (Map<String, dynamic> message) {
        print('on launch $message');
      },
    );
    _firebaseMessaging.requestNotificationPermissions(
        const IosNotificationSettings(sound: true, badge: true, alert: true));
    _firebaseMessaging.getToken().then((token){
      print(token);
    });

我的firebase_messaging依赖

  firebase_messaging: ^1.0.2

我还更改了app/build.gradle中google-services的版本

dependencies {
        classpath 'com.android.tools.build:gradle:3.1.2'
        classpath 'com.google.gms:google-services:3.2.0'
    }

这是添加到 AndroidManifest.xml 文件中用于通知的部分

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

设备日志

03-24 19:14:25.044 2630 2663 I ActivityManager: Start proc 17709:com.example.notif_app/u0a206 for broadcast com.example.notif_app/com.google.firebase.iid.FirebaseInstanceIdReceiver 03-24 19:14:25.047 17709 17709 I art : Late-enabling -Xcheck:jni 03-24 19:14:25.181 17709 17709 D FirebaseApp: com.google.firebase.auth.FirebaseAuth is not linked. Skipping initialization. 03-24 19:14:25.182 17709 17709 D FirebaseApp: com.google.firebase.crash.FirebaseCrash is not linked. Skipping initialization. 03-24 19:14:25.182 17709 17709 I FirebaseInitProvider: FirebaseApp initialization successful 03-24 19:14:25.199 17709 17730 I ResourceExtractor: Found extracted resources res_timestamp-1-1553431828587 03-24 19:14:25.206 17709 17727 I FA : App measurement is starting up, version: 15300 03-24 19:14:25.206 17709 17727 I FA : To enable debug logging run: adb shell setprop log.tag.FA VERBOSE 03-24 19:14:25.207 17709 17727 I FA : To enable faster debug mode event logging run: 03-24 19:14:25.207 17709 17727 I FA : adb shell setprop debug.firebase.analytics.app com.example.notif_app 03-24 19:14:25.220 17709 17709 D AndroidRuntime: Shutting down VM 03-24 19:14:25.221 17709 17709 E AndroidRuntime: FATAL EXCEPTION: main 03-24 19:14:25.221 17709 17709 E AndroidRuntime: Process: com.example.notif_app, PID: 17709 03-24 19:14:25.221 17709 17709 E AndroidRuntime: java.lang.NoSuchMethodError: No static method zzad()Lcom/google/firebase/iid/zzan; in class Lcom/google/firebase/iid/zzan; or its super classes (declaration of 'com.google.firebase.iid.zzan' appears in /data/app/com.example.notif_app-1/base.apk:classes2.dex) 03-24 19:14:25.221 17709 17709 E AndroidRuntime: at com.google.firebase.messaging.FirebaseMessagingService.zzb(Unknown Source) 03-24 19:14:25.221 17709 17709 E AndroidRuntime: at com.google.firebase.iid.zzb.onStartCommand(Unknown Source) 03-24 19:14:25.221 17709 17709 E AndroidRuntime: at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3318) 03-24 19:14:25.221 17709 17709 E AndroidRuntime: at android.app.ActivityThread.-wrap21(ActivityThread.java)

谁能帮我解决这个问题？提前谢谢。

Answer 1

只需运行flutter clean并再次运行您的应用程序。

Answer 2

打开安卓

项目。

去 build.gradle of firebase_messaging

在依赖项中，api 'com.google.firebase:firebase-messaging:18.0.0'更改为 api 'com.google.firebase:firebase-messaging:17.3.3'

确保您使用的是 pubspec.yaml 中所有云依赖项的最新版本

这个解决方案对我有用

Answer 3

就我而言，我按照插件说明进行操作 https://pub.dev/packages/firebase_messaging但是，我的Android应用程序仍然崩溃了。

原因在文件android/app/src/main/kotlin/com/example/app/MainActivity.kt

当我把它改成

package YOUR.APP.PACKAGE
import io.flutter.embedding.android.FlutterActivity
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"));
    }
}

崩溃已经过去。

另外，为了以防万一，侦听即将到来的推送的代码，重要的是要有处理程序用于onBackgroundMessage

static Future<dynamic> myBackgroundMessageHandler(Map<String, dynamic> message) async { print(message); return Future<void>.value(); }
firebaseMessaging.configure(
      // when app is open
      onMessage: (Map<String, dynamic> message) async {
        try {
          Get.defaultDialog(
              title: message['notification']['title'] ?? 'New reaction to comment',
              middleText: message['notification']['body'] ?? 'Click to react',
              textCancel: 'Cancel',
              textConfirm: 'See',
              onCancel: () {},
              onConfirm: () => PushServices.managePushesLinkToProject(message));
        } catch (e) {
          print('$e');
        }
      },
      onLaunch: (Map<String, dynamic> message) async {
        PushServices.managePushesLinkToProject(message);
      },
      onResume: (Map<String, dynamic> message) async {
        PushServices.managePushesLinkToProject(message);
      },
      onBackgroundMessage: myBackgroundMessageHandler,
    );

关键解决方案在这里找到 https://github.com/FirebaseExtended/flutterfire/issues/2311