Flutter App Firebase 推送通知未在后台出现

Question

当应用终止/从后台从最近的应用中删除时，我面临收到通知的问题。

我已经在应用或项目级别的 build.gradle 文件中完成了 android 应用所需的所有设置。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");
  }
}

下面是我完整的 main.dart 文件代码

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;
  }
}

建议我缺少什么或做错了什么。

Answer 1

感谢大家的回复。

我找到了为什么我的后台处理程序无法工作的解决方案，因为我在调试模式下运行我的应用程序。根据 FlutterFire Cloud messaging Doc 后台方法，如果您杀死您的应用程序，则在调试模式下不起作用。

您可以通过在调试中运行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在前台运行。

如果您想在最近的任务中检查应用程序终止/终止后，请在 发布模式 下运行应用程序。效果很好

再次感谢大家。