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  1. import 'package:flutter/material.dart';
  2.  
  3. void main() => runApp(MyApp());
  4.  
  5. class MyApp extends StatelessWidget {
  6.   // This widget is the root of your application.
  7.   @override
  8.   Widget build(BuildContext context) {
  9.     return MaterialApp(
  10.       title: 'Flutter Demo',
  11.       theme: ThemeData(
  12.         // This is the theme of your application.
  13.         //
  14.         // Try running your application with "flutter run". You'll see the
  15.         // application has a blue toolbar. Then, without quitting the app, try
  16.         // changing the primarySwatch below to Colors.green and then invoke
  17.         // "hot reload" (press "r" in the console where you ran "flutter run",
  18.         // or simply save your changes to "hot reload" in a Flutter IDE).
  19.         // Notice that the counter didn't reset back to zero; the application
  20.         // is not restarted.
  21.         primarySwatch: Colors.blue,
  22.       ),
  23.       home: MyHomePage(title: 'Hello Flutter'),
  24.     );
  25.   }
  26. }
  27.  
  28. class MyHomePage extends StatefulWidget {
  29.   MyHomePage({Key key, this.title}) : super(key: key);
  30.  
  31.   // This widget is the home page of your application. It is stateful, meaning
  32.   // that it has a State object (defined below) that contains fields that affect
  33.   // how it looks.
  34.  
  35.   // This class is the configuration for the state. It holds the values (in this
  36.   // case the title) provided by the parent (in this case the App widget) and
  37.   // used by the build method of the State. Fields in a Widget subclass are
  38.   // always marked "final".
  39.  
  40.   final String title;
  41.  
  42.   @override
  43.   _MyHomePageState createState() => _MyHomePageState();
  44. }
  45.  
  46. class _MyHomePageState extends State<MyHomePage> {
  47.   int _counter = 1;
  48.  
  49.   void _incrementCounter() {
  50.     setState(() {
  51.       // This call to setState tells the Flutter framework that something has
  52.       // changed in this State, which causes it to rerun the build method below
  53.       // so that the display can reflect the updated values. If we changed
  54.       // _counter without calling setState(), then the build method would not be
  55.       // called again, and so nothing would appear to happen.
  56.       _counter++;
  57.     });
  58.   }
  59.  
  60.   @override
  61.   Widget build(BuildContext context) {
  62.     // This method is rerun every time setState is called, for instance as done
  63.     // by the _incrementCounter method above.
  64.     //
  65.     // The Flutter framework has been optimized to make rerunning build methods
  66.     // fast, so that you can just rebuild anything that needs updating rather
  67.     // than having to individually change instances of widgets.
  68.     return Scaffold(
  69.       appBar: AppBar(
  70.         // Here we take the value from the MyHomePage object that was created by
  71.         // the App.build method, and use it to set our appbar title.
  72.         title: Text(widget.title),
  73.       ),
  74.       body: Center(
  75.         // Center is a layout widget. It takes a single child and positions it
  76.         // in the middle of the parent.
  77.         child: Column(
  78.           // Column is also layout widget. It takes a list of children and
  79.           // arranges them vertically. By default, it sizes itself to fit its
  80.           // children horizontally, and tries to be as tall as its parent.
  81.           //
  82.           // Invoke "debug painting" (press "p" in the console, choose the
  83.           // "Toggle Debug Paint" action from the Flutter Inspector in Android
  84.           // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
  85.           // to see the wireframe for each widget.
  86.           //
  87.           // Column has various properties to control how it sizes itself and
  88.           // how it positions its children. Here we use mainAxisAlignment to
  89.           // center the children vertically; the main axis here is the vertical
  90.           // axis because Columns are vertical (the cross axis would be
  91.           // horizontal).
  92.           mainAxisAlignment: MainAxisAlignment.center,
  93.           children: <Widget>[
  94.             Text(
  95.               'You have pushed the button this many times:',
  96.             ),
  97.             Text(
  98.               '$_counter',
  99.               style: Theme.of(context).textTheme.display1,
  100.             ),
  101.           ],
  102.         ),
  103.       ),
  104.       floatingActionButton: FloatingActionButton(
  105.         onPressed: _incrementCounter,
  106.         tooltip: 'Increment',
  107.         child: Icon(Icons.add),
  108.       ), // This trailing comma makes auto-formatting nicer for build methods.
  109.     );
  110.   }
  111. }
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