导航到另一个页面并返回后，Flutter Isolate 不会执行 setState

Question

你好，我有一个带计数器的徽章，每当我启动我的 Android 警报管理器时，它应该增加计数器并更新 UI 实时。我用隔离来做到这一点。一切正常，但是当我转到新的页面路由然后返回时，不再执行 SetState。我的错误在哪里？

  int _counter = 0;

  String isolateName = 'isolate';
  final ReceivePort port = ReceivePort();
  static SendPort uiSendPort;


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

    IsolateNameServer.registerPortWithName(
      port.sendPort,
      isolateName,
    );

    port.listen((_) async => await _incrementCounter());
  }

  Future<void> _incrementCounter() async {
    print('Increment counter!');

    // Ensure we've loaded the updated count from the background isolate.
    await prefs.reload();

    if (!mounted) return;
    setState(() {
      print("geht in die SetState");
      _counter++;
    });
  }

///
///This is in my Callback for my Android Alarm Manager...
          final prefs = await SharedPreferences.getInstance();
          int currentCount = prefs.getInt(countKey) ?? 0;
          await prefs.setInt(countKey, currentCount + 1);

          // This will be null if we're running in the background.
          uiSendPort ??= IsolateNameServer.lookupPortByName('isolate');
          uiSendPort?.send(null);

Answer 1

initState返回后没有再次调用，返回后尝试强制执行你想要的功能

类似的东西

Navigator.of(context)
  .push(MaterialPageRoute(
     builder: (context) => YourScreen№2(),
  ))
  .then((value) {
    Foo() <- your func
  });

导航到另一个页面并返回后，Flutter Isolate 不会执行 setState

Flutter Isolate doesn't go do setState after navigate to a other page and back

android

setstate

dart

dart-isolates

flutter