List.generate中的Flutter RadioListTile无法正常工作

import 'package:flutter/material.dart';

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

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

class RadioListExample extends StatefulWidget {
  @override
  _RadioListExampleState createState() => _RadioListExampleState();
}

class _RadioListExampleState extends State<RadioListExample> {
  int _selectedValue = 0;

  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      itemCount: 3,
      itemBuilder: (context, index) {
        return RadioListTile<int>(
          title: Text('Option ${index + 1}'),
          value: index,
          groupValue: _selectedValue,
          onChanged: (value) {
            setState(() {
              _selectedValue = value!;
            });
          },
        );
      },
    );
  }
}