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トップに関する質問【flutter】クラスを呼び出す記述方法がわかりません

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3

修正

2021/01/30 06:49

投稿

narururu
narururu

スコア172

test CHANGED
File without changes
test CHANGED
@@ -384,6 +384,8 @@
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+ // ignore: must_be_immutable
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+
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  class MyHomePage extends StatefulWidget {
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  MyHomePage({Key key, this.title}) : super(key: key);
@@ -504,6 +506,16 @@
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  class ChangeClass extends StatefulWidget {
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+ ChangeClassPage createState() => ChangeClassPage();
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+
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+ }
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+
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+
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+
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+ class ChangeClassPage extends State<ChangeClass> {
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+
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+
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+
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  int _counter = 0;
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@@ -550,7 +562,13 @@
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  '$_counter',
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- style: Theme.of(context).textTheme.headline4,
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+ style: Theme
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+
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+ .of(context)
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+
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+ .textTheme
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+
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+ .headline4,
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  ),
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@@ -574,8 +592,8 @@
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  }
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-
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-
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- }
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+ }
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+
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+
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  ```

2

追記修正

2021/01/30 06:49

投稿

narururu
narururu

スコア172

test CHANGED
File without changes
test CHANGED
@@ -396,7 +396,7 @@
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  @override
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- _MyHomePageState createState() => _MyHomePageState();
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+ MyHomePageState createState() => MyHomePageState();
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  }
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@@ -410,7 +410,7 @@
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  static List<Widget> _widgetOptions = <Widget>[
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- MyHomePage(),
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+ ChangeClass(),
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  Text(
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@@ -502,7 +502,7 @@
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  }
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- class _MyHomePageState extends State<MyHomePage> {
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+ class ChangeClass extends StatefulWidget {
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  int _counter = 0;
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@@ -528,7 +528,7 @@
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  appBar: AppBar(
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- title: Text(widget.title),
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+ title: Text('narururu'),
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  ),
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1

追記

2021/01/29 10:22

投稿

narururu
narururu

スコア172

test CHANGED
File without changes
test CHANGED
@@ -339,3 +339,243 @@
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  どなたかアドバイスいただけますと幸いです。
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  よろしくお願いいたします。
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+
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+
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+
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+ ## 追記
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+
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+ ```ここに言語を入力
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+
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+ import 'package:flutter/material.dart';
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+
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+
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+
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+ void main() {
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+
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+ runApp(CountApp());
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+
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+ }
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+
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+
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+
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+ class CountApp extends StatelessWidget {
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+
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+ @override
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+
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+ Widget build(BuildContext context) {
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+
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+ return MaterialApp(
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+
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+ title: 'CountApp',
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+
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+ theme: ThemeData(
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+
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+ visualDensity: VisualDensity.adaptivePlatformDensity,
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+
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+ ),
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+
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+ home: MyHomePage(title: 'Flutter Demo Home Page'),
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+
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+ );
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+
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+ }
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+
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+ }
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+
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+
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+
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+ class MyHomePage extends StatefulWidget {
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+
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+ MyHomePage({Key key, this.title}) : super(key: key);
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+
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+
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+
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+ String title;
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+
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+
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+
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+ @override
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+
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+ _MyHomePageState createState() => _MyHomePageState();
400
+
401
+ }
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+
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+
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+
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+
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+
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+ class MyHomePageState extends State<MyHomePage> {
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+
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+ int _selectedIndex = 0;
410
+
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+ static List<Widget> _widgetOptions = <Widget>[
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+
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+ MyHomePage(),
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+
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+ Text(
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+
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+ 'Index 1: Business',
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+
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+ ),
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+
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+ Text(
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+
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+ 'Index 2: School',
424
+
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+ ),
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+
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+ ];
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+
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+
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+
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+ void _onItemTapped(int index) {
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+
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+ setState(() {
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+
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+ _selectedIndex = index;
436
+
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+ });
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+
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+ }
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+
441
+
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+
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+ @override
444
+
445
+ Widget build(BuildContext context) {
446
+
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+ return Scaffold(
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+
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+ appBar: AppBar(
450
+
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+ title: const Text('BottomNavigationBar Sample'),
452
+
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+ ),
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+
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+ body: Center(
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+
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+ child: _widgetOptions.elementAt(_selectedIndex),
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+
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+ ),
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+
461
+ bottomNavigationBar: BottomNavigationBar(
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+
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+ items: const <BottomNavigationBarItem>[
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+
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+ BottomNavigationBarItem(
466
+
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+ icon: Icon(Icons.home),
468
+
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+ label: 'Home',
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+
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+ ),
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+
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+ BottomNavigationBarItem(
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+
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+ icon: Icon(Icons.business),
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+
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+ label: 'Business',
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+
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+ ),
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+
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+ BottomNavigationBarItem(
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+
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+ icon: Icon(Icons.school),
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+
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+ label: 'School',
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+
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+ ),
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+
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+ ],
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+
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+ currentIndex: _selectedIndex,
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+
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+ selectedItemColor: Colors.amber[800],
494
+
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+ onTap: _onItemTapped,
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+
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+ ),
498
+
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+ );
500
+
501
+ }
502
+
503
+ }
504
+
505
+ class _MyHomePageState extends State<MyHomePage> {
506
+
507
+ int _counter = 0;
508
+
509
+
510
+
511
+ void _incrementCounter() {
512
+
513
+ setState(() {
514
+
515
+ _counter++;
516
+
517
+ });
518
+
519
+ }
520
+
521
+
522
+
523
+ @override
524
+
525
+ Widget build(BuildContext context) {
526
+
527
+ return Scaffold(
528
+
529
+ appBar: AppBar(
530
+
531
+ title: Text(widget.title),
532
+
533
+ ),
534
+
535
+ body: Center(
536
+
537
+ child: Column(
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+
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+ mainAxisAlignment: MainAxisAlignment.center,
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+
541
+ children: <Widget>[
542
+
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+ Text(
544
+
545
+ 'You have pushed the button this many times:',
546
+
547
+ ),
548
+
549
+ Text(
550
+
551
+ '$_counter',
552
+
553
+ style: Theme.of(context).textTheme.headline4,
554
+
555
+ ),
556
+
557
+ ],
558
+
559
+ ),
560
+
561
+ ),
562
+
563
+ floatingActionButton: FloatingActionButton(
564
+
565
+ onPressed: _incrementCounter,
566
+
567
+ tooltip: 'Increment',
568
+
569
+ child: Icon(Icons.add),
570
+
571
+ ), // This trailing comma makes auto-formatting nicer for build methods.
572
+
573
+ );
574
+
575
+ }
576
+
577
+
578
+
579
+ }
580
+
581
+ ```