如何在带有Provider的ListView中返回Future<double>？

import 'package:flutter/material.dart';

class MyProvider extends ChangeNotifier {
  Future<double> fetchData() async {
    // 在这里执行异步操作，比如从网络获取数据
    // 返回一个Future<double>对象
    return 3.14;
  }
}

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

class MyPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('ListView with Provider'),
      ),
      body: Consumer<MyProvider>(
        builder: (context, provider, _) {
          return ListView.builder(
            itemCount: 1,
            itemBuilder: (context, index) {
              return FutureBuilder<double>(
                future: provider.fetchData(),
                builder: (context, snapshot) {
                  if (snapshot.connectionState == ConnectionState.waiting) {
                    return CircularProgressIndicator();
                  } else if (snapshot.hasError) {
                    return Text('Error: ${snapshot.error}');
                  } else {
                    return Text('Data: ${snapshot.data}');
                  }
                },
              );
            },
          );
        },
      ),
    );
  }
}

void main() {
  runApp(
    MultiProvider(
      providers: [
        ChangeNotifierProvider(create: (_) => MyProvider()),
      ],
      child: MyApp(),
    ),
  );
}