| |
| import 'package:flutter/material.dart'; |
| |
| void main() { |
| |
| |
| |
| runApp(const MyApp()); |
| } |
| |
| class MyApp extends StatelessWidget { |
| const MyApp({Key? key}) : super(key: key); |
| |
| @override |
| Widget build(BuildContext context) { |
| return MaterialApp( |
| |
| title: 'Flutter Demo', |
| theme: ThemeData( |
| |
| primarySwatch: Colors.blue, |
| ), |
| |
| home: const MyHomePage(title: 'hello world'), |
| ); |
| } |
| } |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| class MyHomePage extends StatefulWidget { |
| const MyHomePage({Key? key, required this.title}) : super(key: key); |
| final String title; |
| |
| @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.headline4, |
| ), |
| ], |
| ), |
| ), |
| floatingActionButton: FloatingActionButton( |
| onPressed: _incrementCounter, |
| tooltip: 'Increment', |
| child: Icon(Icons.add), |
| ), |
| ); |
| } |
| } |
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