来自API调用的JSON数据在ListView FutureBuilder Flutter中不显示

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';

class MyWidget extends StatelessWidget {
  Future<List<dynamic>> fetchData() async {
    final response = await http.get('your_api_url');
    if (response.statusCode == 200) {
      return json.decode(response.body);
    } else {
      throw Exception('Failed to fetch data');
    }
  }

  @override
  Widget build(BuildContext context) {
    return FutureBuilder<List<dynamic>>(
      future: fetchData(),
      builder: (BuildContext context, AsyncSnapshot<List<dynamic>> snapshot) {
        if (snapshot.connectionState == ConnectionState.waiting) {
          return CircularProgressIndicator();
        } else if (snapshot.hasError) {
          return Text('Error: ${snapshot.error}');
        } else {
          return ListView.builder(
            itemCount: snapshot.data.length,
            itemBuilder: (BuildContext context, int index) {
              return ListTile(
                title: Text(snapshot.data[index]['title']),
                subtitle: Text(snapshot.data[index]['subtitle']),
              );
            },
          );
        }
      },
    );
  }
}