如何在flutter中拉取刷新FutureBuilder<List<Data>> ()；页面？

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('Refresh FutureBuilder Example')),
        body: MyHomePage(),
      ),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  Future<List<Data>> _futureData;

  @override
  void initState() {
    super.initState();
    _futureData = fetchData();
  }

  Future<List<Data>> fetchData() async {
    // Simulate network call or any other asynchronous operation
    await Future.delayed(Duration(seconds: 2));
    return [
      Data(name: 'Item 1'),
      Data(name: 'Item 2'),
      Data(name: 'Item 3'),
    ];
  }

  @override
  Widget build(BuildContext context) {
    return RefreshIndicator(
      onRefresh: () async {
        setState(() {
          _futureData = fetchData();
        });
      },
      child: FutureBuilder<List<Data>>(
        future: _futureData,
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            return Center(child: CircularProgressIndicator());
          } else if (snapshot.hasError) {
            return Center(child: Text('Error: ${snapshot.error}'));
          } else {
            return ListView.builder(
              itemCount: snapshot.data?.length ?? 0,
              itemBuilder: (context, index) {
                return ListTile(
                  title: Text(snapshot.data[index].name),
                );
              },
            );
          }
        },
      ),
    );
  }
}

class Data {
  final String name;

  Data({required this.name});
}