Flutter FCM onMessage 在收听时不起作用

Question

我有这个问题...发送通知时，监听 onMessage 时的回调没有被调用，而通知显示在设备上。

初始化时

FirebaseMessaging.instance.requestPermission(
    sound: true,
    badge: true,
    alert: true,
    provisional: false,
  );

String? token = await _firebaseMessaging.getToken();


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

正在收听

 FirebaseMessaging.onMessage.handleError((error) {
      print("Erorrrrrr : ${error.toString()}");
    }).listen((event) {
      print(event.data);
      _showNotification({
        "title": event.notification?.title ?? "",
        "body": event.notification?.body ?? "",
      });
    });

公共规范：
SDK: ">=2.12.0 <3.0.0",
firebase_core: ^1.0.0
firebase_messaging: ^9.0.0

医生总结

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel master, 2.1.0-13.0.pre.214, on macOS 11.2.3 20D91 darwin-x64, locale en-EG)
[!] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    ! Some Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses
[✓] Xcode - develop for iOS and macOS
[✓] Chrome - develop for the web
[✓] Android Studio (version 4.1)
[✓] Connected device

Answer 1

如果您从 firebase 控制台发送通知并尝试打印
打印（event.data）；这将引发异常，因为在这种情况下数据将为空，您必须调用 event.title 或 body

Flutter FCM onMessage 在收听时不起作用

Flutter FCM onMessage doesn't work when listen to it

push-notification

flutter

firebase-notifications