import'package:dio/dio.dart';voidgetHttp()async{try{Response response=awaitDio().get("http://www.baidu.com");print(response);}catch(e){print(e);}} 封装开始 网络请求是经常会用到的,所以直接来一个单例,新建一个名为httpUtil的文件 代码语言:javascript 代码运行次数:0 运行 AI代码解释 classHtt...
import'dart:async';import'dart:convert';import'package:flutter/foundation.dart';import'package:http/http.dart'ashttp;import'package:flutter_news/model/news.dart';classNewsApi{staticFuture<NewsList>getHeadLines({String category:"general",int page:0})async{final response=awaithttp.get("https://news...
class NewPage extends StatelessWidget {final String data;NewPage({required this.data});@overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(title: Text('New Page'),),body: Center(child: Text('Data received: $data'),),);}}// 在跳转时传递参数MaterialPageRoute newPage...
class MyWidget extends StatelessWidget {@overrideWidget build(BuildContext context) {var authService = Get.find<AuthService>();if (authService.isUserLoggedIn) {// 用户已登录,显示用户信息} else {// 用户未登录,显示登录页面}}} 这样,我们就可以在应用的任何地方访问和修改AuthService,而无需手动传递...
abstract class MultiChildRenderObjectWidget extends RenderObjectWidget {}abstract class RenderObjectWidget extends Widget {RenderObjectElement ;RenderObject createRenderObject(BuildContext context); // 抽象⽅法-创建RenderObjectvoid updateRenderObject(BuildContext context, covariant RenderObject renderObject) {}void ...
脱字号“^”开头的版本表示和当前版本接口保持兼容的最新版,^1.2.3等效于>=1.2.3 <2.0.0而^0.1.2等效于>=0.1.2 <0.2.0,添加依赖后点击“Packages get”按钮即可下载插件到本地,在代码中添加import语句就可以使用插件提供的接口: import'package:shared_preferences/shared_preferences.Dart';class_MyAppStateexten...
// ignore: prefer_const_constructors_in_immutables , never use const for this class UniqueKey(); @override String toString() => '[#${shortHash(this)}]'; 这里我们可以看出这个UniqueKey是产生了一个随机值的字符串,所以这里一定是唯一的。
class IncrementBloc{ int _counter; // // Stream to handle the counter,第一组stream // StreamController<int> _counterController = StreamController<int>(); StreamSink<int> get _inAdd => _counterController.sink;//这个sink用与给outCounter添加数据 ...
class ScopedInstantEnd { public: ScopedInstantEnd(const char* str) : label_(str) {} ~ScopedInstantEnd() { TraceEventEnd(label_); } private: const char* label_; FML_DISALLOW_COPY_AND_ASSIGN(ScopedInstantEnd); }; 可以看到析构函数中会调用 TraceEventEnd 方法,也就是说离开了作用域就会调用 ...
import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { // This widget is the root of your application. @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', home: MyHomePage(), ); } } class MyHo...