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Flutter常用元件(Widget)解析-Container

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( theme: ThemeData( primarySwatch: Colors.blue, ), home:
new CenterDemoPage() , ); } } class CenterDemoPage extends StatefulWidget { @override createState() =>new CenterDemoPageState(); } class CenterDemoPageState extends State<CenterDemoPage> { @override Widget build(BuildContext context){ return new Scaffold( appBar: new
AppBar( title: new Text('Container Widget Demo'), ), body: _buildDemo(), ); } Widget _buildDemo() { return new Center( child: Container( child: new Text('Hello world',style: TextStyle(fontSize: 48.0)), alignment: Alignment.center, ), ); } }