在flutter中从json API获取数据时被CircularProgressIndicator卡住

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

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

class _MyWidgetState extends State<MyWidget> {
  bool isLoading = true;
  List<dynamic> data = [];

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

  Future<void> fetchData() async {
    try {
      var response = await http.get('https://api.example.com/data');
      if (response.statusCode == 200) {
        setState(() {
          data = json.decode(response.body);
          isLoading = false;
        });
      } else {
        // 处理请求失败的情况
      }
    } catch (e) {
      // 处理网络请求异常
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Data from JSON API'),
      ),
      body: isLoading
          ? Center(
              child: CircularProgressIndicator(),
            )
          : ListView.builder(
              itemCount: data.length,
              itemBuilder: (context, index) {
                return ListTile(
                  title: Text(data[index]['title']),
                  subtitle: Text(data[index]['description']),
                );
              },
            ),
    );
  }
}