小编Muh*_*mad的帖子

我在 StatelessWidget 中有一个 ListView。它有项目，每个项目都包含一个复选框。当有人检查项目时，我希望 ListView 将其作为参数发送到另一个页面。但是当我这样做时，它给了我这个错误：

I/flutter ( 7067): The following UnsupportedError was thrown while handling a gesture:
I/flutter ( 7067): Unsupported operation: Cannot add to an unmodifiable list
I/flutter ( 7067): When the exception was thrown, this was the stack:

这是我的代码

class StudentsList extends StatelessWidget {
  final List<Child> mList;
  StudentsList({this.mList});

  @override
  Widget build(BuildContext context) {
    List<Child> selectedList = [];

    return Container(
      margin: EdgeInsets.only(top: 50, bottom: 20),
      child: ListView.builder(
        shrinkWrap: true,
        physics: ClampingScrollPhysics(),
        itemCount: mList == null ? 0 : …

我正在尝试从本机 Android 打开颤动屏幕

所以我尝试使用 MethodChannel 将数据返回到 dart，然后调用将我导航到当前屏幕的方法

但我的代码不起作用

这是我的代码

@Override
public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
    super.configureFlutterEngine(flutterEngine);
    String channelName = "app_channel";
    MethodChannel methodChannel = new MethodChannel(flutterEngine.getDartExecutor(), channelName);

    methodChannel.invokeMethod("openCaller", false, new MethodChannel.Result() {
        @Override
        public void success(@Nullable Object result) {
            Log.i("fromInvoke","success" + result.toString());
        }

        @Override
        public void error(String errorCode, @Nullable String errorMessage, @Nullable Object errorDetails) {
            Log.i("fromInvoke","failed" + errorMessage);

        }

        @Override
        public void notImplemented() {
            Log.i("fromInvoke","not implemented");

        }
    });
}

}

  static const platform =
      const MethodChannel('app_channel');

  @override
  void initState() { …

当应用程序处于前台或后台时，flutter_local_notifications 工作正常

但是当应用程序终止时

onSelectNotification 没有按预期工作，而是打开应用程序

static void initializeLocalNotification() async {
    FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
        FlutterLocalNotificationsPlugin();
    const AndroidInitializationSettings initializationSettingsAndroid =
        AndroidInitializationSettings('ic_launcher');
    final IOSInitializationSettings initializationSettingsIOS =
        IOSInitializationSettings(
      requestSoundPermission: false,
      requestBadgePermission: false,
      requestAlertPermission: false,
    );

    final InitializationSettings initializationSettings =
        InitializationSettings(
      android: initializationSettingsAndroid,
      iOS: initializationSettingsIOS,
    );
    await flutterLocalNotificationsPlugin.initialize(initializationSettings,
        onSelectNotification: (String payload) async {
      SharedPreferences prefs = await SharedPreferences.getInstance();
      var res = await prefs.setString(kNotificationPayLoad, payload);
      // navigatorKey.currentState
      //     .push(MaterialPageRoute(builder: (_) => LoginScreen()));
      // navigatorKey.currentState.pop();
    });

    await flutterLocalNotificationsPlugin
        .resolvePlatformSpecificImplementation<
            IOSFlutterLocalNotificationsPlugin>()
        ?.requestPermissions(
          alert: true,
          badge: true,
          sound: true, …