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Flutter事例源代码分析
import 'package:flutter/material.dart';
//引用库void main() => runApp(new MyApp());
//应用入口，表示启动应用//应用结构如下
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',//应用名称
theme: new ThemeData(
primarySwatch: Colors.blue,//应用主题
),
home: new MyHomePage(title: 'Flutter Demo Home Page'),//首页路由，即主界面。其中home也是一个weight
);
}
}//首页代码
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => new _MyHomePageState();
//产生对应的状态类
}//状态类如下
class _MyHomePageState extends State {
int _counter = 0;
//状态，相当于变量声明//设置的函数
void _incrementCounter() {
setState(() {
_counter++;
});
}//构建UI界面代码如下
@override
Widget build(BuildContext context) {
return new Scaffold(//其中Scaffold是Material库提供的一个weight，包含了许多常用的控件。
appBar: new AppBar(
title: new Text(widget.title),
),
body: new Center(
child: new Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
new Text(
'You have pushed the button this many times:',
),
new Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
],
),
),
floatingActionButton: new FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: new Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}
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