谷歌开源的跨平台UI开发框架Flutter

谷歌开源的跨平台UI开发框架Flutter

Flutter是Google一个新的用于构建跨平台的手机App的SDK。写一份代码，在Android 和iOS平台上都可以运行。与React Native、Weex不同，React Native、Weex等一直存在一个问题，就是性能跟原生App存在很大的差异。

Fast Development
Expressive and Flexible UI
Native Performance

说明文档：https://flutter.dev/docs

配置Fluter环境

获取Flutter SDK

git clone https://github.com/flutter/flutter.git -b stable

配置环境变量

将获取Flutter SDK的完整的路径 D:\Users\flutter\bin 加入到path路径当中即可

检查依赖是否成功

运行cmd，输入flutter doctor

C:\Users\Admin>flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 1.22.3, on Microsoft Windows [Version 10.0.18363.1139], locale zh-CN)

查看设备

运行cmd，输入flutter devices

配置Flutter IDE

安装Android Studio
下载Flutter和Dart插件：Flutter用于开发者的工作，比如编译调试等，Dart用于编码，解析。

打开Android Studio，选择File-settings-Plugins-Marketplace，搜索Flutter，安装重启IDE即可

创建Flutter Application

选择File>New Flutter Project，选择项目类型为Fluter Application
输入项目名称，选择配置Flutter SDK路径，点击finish创建项目
使用Flutter的热重载能力特性
Flutter Hot Reload：提供给开发者快速修改UI，增加功能，修复bug，不需要重新启动应用，即可看到改动效果。

在Flutter项目中，Application的代码是lib/main.dart

import 'package:flutter/material.dart';void main() {runApp(MyApp());
}class MyApp extends StatelessWidget {// This widget is the root of your application.@overrideWidget build(BuildContext context) {return MaterialApp(title: 'Flutter Demo',theme: ThemeData(// This is the theme of your application.//// Try running your application with "flutter run". You'll see the// application has a blue toolbar. Then, without quitting the app, try// changing the primarySwatch below to Colors.green and then invoke// "hot reload" (press "r" in the console where you ran "flutter run",// or simply save your changes to "hot reload" in a Flutter IDE).// Notice that the counter didn't reset back to zero; the application// is not restarted.primarySwatch: Colors.blue,// This makes the visual density adapt to the platform that you run// the app on. For desktop platforms, the controls will be smaller and// closer together (more dense) than on mobile platforms.visualDensity: VisualDensity.adaptivePlatformDensity,),home: MyHomePage(title: 'Flutter Demo Home Page'),);}
}class MyHomePage extends StatefulWidget {MyHomePage({Key key, this.title}) : super(key: key);// This widget is the home page of your application. It is stateful, meaning// that it has a State object (defined below) that contains fields that affect// how it looks.// This class is the configuration for the state. It holds the values (in this// case the title) provided by the parent (in this case the App widget) and// used by the build method of the State. Fields in a Widget subclass are// always marked "final".final String title;@override_MyHomePageState createState() => _MyHomePageState();
}class _MyHomePageState extends State<MyHomePage> {int _counter = 0;void _incrementCounter() {setState(() {// This call to setState tells the Flutter framework that something has// changed in this State, which causes it to rerun the build method below// so that the display can reflect the updated values. If we changed// _counter without calling setState(), then the build method would not be// called again, and so nothing would appear to happen._counter++;});}@overrideWidget build(BuildContext context) {// This method is rerun every time setState is called, for instance as done// by the _incrementCounter method above.//// The Flutter framework has been optimized to make rerunning build methods// fast, so that you can just rebuild anything that needs updating rather// than having to individually change instances of widgets.return Scaffold(appBar: AppBar(// Here we take the value from the MyHomePage object that was created by// the App.build method, and use it to set our appbar title.title: Text(widget.title),),body: Center(// Center is a layout widget. It takes a single child and positions it// in the middle of the parent.child: Column(// Column is also a layout widget. It takes a list of children and// arranges them vertically. By default, it sizes itself to fit its// children horizontally, and tries to be as tall as its parent.//// Invoke "debug painting" (press "p" in the console, choose the// "Toggle Debug Paint" action from the Flutter Inspector in Android// Studio, or the "Toggle Debug Paint" command in Visual Studio Code)// to see the wireframe for each widget.//// Column has various properties to control how it sizes itself and// how it positions its children. Here we use mainAxisAlignment to// center the children vertically; the main axis here is the vertical// axis because Columns are vertical (the cross axis would be// horizontal).mainAxisAlignment: MainAxisAlignment.center,children: <Widget>[Text('You have clicked the button this many times:',),Text('$_counter',style: Theme.of(context).textTheme.headline4,),],),),floatingActionButton: FloatingActionButton(onPressed: _incrementCounter,tooltip: 'Increment',child: Icon(Icons.add),), // This trailing comma makes auto-formatting nicer for build methods.);}
}

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谷歌开源的跨平台UI开发框架Flutter

配置Fluter环境

配置Flutter IDE

创建Flutter Application

谷歌开源的跨平台UI开发框架Flutter相关推荐

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