如何在flutter中调用OnvalueChanged？

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  bool _value = false;

  void _handleValueChanged(bool value) {
    setState(() {
      _value = value;
    });
    // 在这里执行值发生变化时的操作
  }

  @override
  Widget build(BuildContext context) {
    return Switch(
      value: _value,
      onChanged: _handleValueChanged,
    );
  }
}

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Flutter OnvalueChanged Example'),
        ),
        body: Center(
          child: MyWidget(),
        ),
      ),
    );
  }
}