flutter - Flutter代码报错：setState未定义？

Question

调用setState直接报错，代码提示也没有这个方法，不知道是什么原因

import 'package:flutter/material.dart';   // 导入安卓风格的组件import 'package:http/http.dart' as http;          // 导入http库class HttpDemo extends StatefulWidget {  const HttpDemo({super.key});  @override  State<HttpDemo> createState() => _HttpDemoState();}class _HttpDemoState extends State<HttpDemo> {  var responseShow = "";  @override  Widget build(BuildContext context) {    return Scaffold(      appBar: AppBar(title: const Text("学习Http库"),),      body: Column(children: [        _doGetBtn(),        Text("返回的结果：$responseShow")      ],),    );  }}_doGetBtn(){   return const ElevatedButton(onPressed: _doGet, child: Text("通过Get发送请求"));}// 发送get请求void _doGet() async{  var uri = Uri.parse("https://api.geekailab.com/uapi/test/test?requestPrams=11");  var response =await http.get(uri);  if(response.statusCode == 200){    setState((){      responseShow = response.body;    });  }}

网上查询，暂时无果

Answer 1

创建一个*.dart 文件后可以输入： stl 或者 stf 来快速创建widget，避免这种情况；这里有更多的快捷键