标签：执行 text 设计 mep 相同 配置环境 androi 大量 center
初识flutter
import ‘package:flutter/material.dart‘;
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {br/>@override
Widget build(BuildContext context) {
return MaterialApp(
title: ‘Flutter Demo‘,
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: ‘Flutter Demo Home Page‘),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;br/>@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
_counter++;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
‘You have pushed the button this many times:‘,
),
Text(
‘$_counter‘,
style: Theme.of(context).textTheme.display1,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: ‘Increment‘,
child: Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}
可以看到两个类MyApp和MyHomePage，从名字我们就可以看出，一个是App的入口，一个是首页，前者继承StatelessWidget，后者继承StatefulWidget，说明MyApp是不需要状态的，而MyHomePage是需要的，所以它实现了createState方法来生成一个State（不管是StatelessWidget还是StatefulWidget，本身都是不可变的），_MyHomePageState继承了State<MyHomePage>，重写了build方法，返回Scaffold，其实Scaffold中的代码就是展示在页面中的内容。最后附上flutter的架构图：
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标签：执行 text 设计 mep 相同 配置环境 androi 大量 center
原文地址：http://blog.51cto.com/13983283/2335618
