Flutter App Firebase 推送通知不在后台

Question

当应用 terminated/Remove 从最近的后台应用收到通知时，我遇到了问题。

我已经在 build.gradle 文件中完成 android 应用程序或项目级别所需的所有设置。当应用打开或应用在最近的应用中时，我能够收到推送通知。

库版本

firebase_messaging: ^11.2.0
firebase_core: ^1.10.0
flutter_local_notifications: ^9.1.4

这是我的代码。

await Firebase.initializeApp();

    FirebaseMessaging messaging = FirebaseMessaging.instance;

    messaging.getToken().then((value) {
      print('firebase token =$value');    
    });

    FirebaseMessaging.onMessage.listen((RemoteMessage message) async {
      //print(event.notification!.body);
      RemoteNotification? notification = message.notification;
      if (notification != null) {
        print("Notification received when app in foreground");
      }
    });

    FirebaseMessaging.onMessageOpenedApp.listen((message) {
      print('Message clicked!');
    });

    await FirebaseMessaging.instance.setForegroundNotificationPresentationOptions(
      alert: true,
      badge: true,
      sound: true,
    );

BackgroundMessage 处理程序代码如下

Future<void> _messageHandler(RemoteMessage message) async {
  await Firebase.initializeApp();
  RemoteNotification? notification = message.notification;
  if (notification != null) {
    print("Notification received when app in background");
  }
}

下面是我main.dart文件的完整代码

Future<void> _messageHandler(RemoteMessage message) async {
  await Firebase.initializeApp();
  RemoteNotification? notification = message.notification;
  if (notification != null) {
    print("Notification received when app in background");
  }
}

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  FirebaseMessaging.onBackgroundMessage(_messageHandler);
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  bool isUserLoggedIn = true;
  bool isLogoutAlertShown = false;
  final materialAppKey = GlobalKey();
  late FirebaseMessaging messaging;


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

  setUpNotification() async {
    messaging = FirebaseMessaging.instance;
    messaging.getToken().then((value) {
      print('firebase token =$value');
      //sendTokenToServer(value);
      Pref.setFcmToken(token: '$value');
    });
    FirebaseMessaging.onMessage.listen((RemoteMessage message) async {
      //print(event.notification!.body);
      RemoteNotification? notification = message.notification;
      if (notification != null) {
        print("Notification received when app in foreground");
      }
    });
    FirebaseMessaging.onMessageOpenedApp.listen((message) {
      print('Message clicked!');
    });
   await FirebaseMessaging.instance.setForegroundNotificationPresentationOptions(
      alert: true,
      badge: true,
      sound: true,
    );
  }

  @override
  Widget build(BuildContext context) {
    return _materialApp();
  }

  Widget _materialApp() {
    return FutureBuilder(
        future: _loginState(),
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.done) {
            return MaterialApp(
              debugShowCheckedModeBanner: false,
              key: materialAppKey,
              darkTheme: AppTheme.lightTheme,
              theme: AppTheme.lightTheme,
              home: isUserLoggedIn == true ? 
              BottomNavigationContainer() : LoginOptions(),
            );
          } else {
            return Container(color: Colors.white);
          }
        });
  }

  Future<void> _loginState() async {
    final token = await Pref.getToken();
    isUserLoggedIn = token.length > 0 ? true : false;
  }
}

告诉我我遗漏了什么或做错了什么。

Answer 1

感谢大家的回复。

我找到了为什么我的后台处理程序不工作的解决方案，因为我运行在调试模式下安装我的应用程序。根据 FlutterFire Cloud messaging Doc 如果您杀死您的应用程序，后台方法在调试模式下不起作用。

您可以通过运行调试您的应用程序来测试您的后台处理程序方法，然后通过切换应用程序使其不再处于前台。

如果您想从最近的任务中检查应用程序 terminate/kill 之后，然后运行应用程序处于 发布模式 。工作正常

再次感谢大家。

Flutter App Firebase 推送通知不在后台

Flutter App Firebase push notification not coming in background

android

push-notification

firebase

flutter

firebase-cloud-messaging