[FLUTTER] 안드로이드 스튜디오에 연결된 가상 장치 조회하기
■ 안드로이드 스튜디오에 연결된 가상 장치를 조회하는 방법을 보여준다. 1. [Windows PowerShel]을 실행한다. 2. 아래 명령을 실행해 현재 디렉토리를 변경한다. ▶ 실행
[카테고리:] FLUTTER
[FLUTTER] TextField 클래스 : keyboardType/controller 속성 사용하기
■ TextField 클래스의 keyboardType/controller 속성을 사용하는 방법을 보여준다. ▶ 예제 코드 (DART)
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TextEditingController controller = TextEditingController(); TextField( keyboardType: TextInputType.number, controller: controller, ) |
[FLUTTER] EdgeInsets 클래스 : only 생성자 사용하기
■ EdgeInsets 클래스의 only 생성자를 사용하는 방법을 보여준다. ▶ 예제 코드 (DART)
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EdgeInsets.only(left: 20, right: 20) |
[FLUTTER] EdgeInsets 클래스 : all 생성자 사용하기
■ EdgeInsets 클래스의 all 생성자를 사용하는 방법을 보여준다. ▶ 예제 코드 (DART)
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EdgeInsets.all(15) |
[FLUTTER] 사칙연산 계산기 만들기
■ 사칙연산 계산기를 만드는 방법을 보여준다. ▶ main.dart
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import 'package:flutter/material.dart'; void main() => runApp(TestApplication()); class TestApplication extends StatelessWidget { static const String _title = 'Test Application'; @override Widget build(BuildContext context) { return MaterialApp( title: _title, home: MainPage(), ); } } class MainPage extends StatefulWidget { MainPage({Key key}) : super(key: key); @override _MainPageState createState() => _MainPageState(); } class _MainPageState extends State<MainPage> { List<String> _buttonTextList = ['더하기', '빼기', '곱하기', '나누기']; List<DropdownMenuItem<String>> _menuItemList = List<DropdownMenuItem<String>>(); String _currentButtonText; String _resultText = ''; TextEditingController controller1 = TextEditingController(); TextEditingController controller2 = TextEditingController(); @override void initState() { super.initState(); for (String buttonText in _buttonTextList) { _menuItemList .add(DropdownMenuItem(value: buttonText, child: Text(buttonText))); } _currentButtonText = _menuItemList[0].value; } Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('Test Application'), ), body: Container( child: Center( child: Column( children: <Widget>[ Padding( padding: EdgeInsets.all(15), child: Text( '결과 : $_resultText', style: TextStyle(fontSize: 20), ), ), Padding( padding: EdgeInsets.only(left: 20, right: 20), child: TextField( keyboardType: TextInputType.number, controller: controller1, ), ), Padding( padding: EdgeInsets.only(left: 20, right: 20), child: TextField( keyboardType: TextInputType.number, controller: controller2, ), ), Padding( padding: EdgeInsets.all(15), child: RaisedButton( child: Row( children: <Widget>[ Icon(Icons.add), Text(_currentButtonText), ], ), color: Colors.amber, onPressed: () { setState(() { double value1 = double.parse(controller1.value.text); double value2 = double.parse(controller2.value.text); double result; if (_currentButtonText == '더하기') { result = value1 + value2; } else if (_currentButtonText == '빼기') { result = value1 - value2; } else if (_currentButtonText == '곱하기') { result = value1 * value2; } else { result = value1 / value2; } _resultText = result.toString(); }); }), ), Padding( padding: EdgeInsets.all(15), child: DropdownButton( items: _menuItemList, onChanged: (value) { setState(() { _currentButtonText = value; }); }, value: _currentButtonText, ), ), ], ), ), ), ); } } |
test_app.zip
[FLUTTER] 폰트 파일 추가하기
■ 폰트 파일을 추가하는 방법을 보여준다. ▶ pubspec.yaml
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name: test_app description: A new Flutter application. publish_to: 'none' version: 1.0.0+1 environment: sdk: ">=2.7.0 <3.0.0" dependencies: flutter: sdk: flutter cupertino_icons: ^1.0.2 dev_dependencies: flutter_test: sdk: flutter flutter: uses-material-design: true assets: - image/flutter.png fonts: - family: Pacifico fonts: - asset: font/Pacifico-Regular.ttf weight: 400 |
▶ imagePage.dart
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import 'package:flutter/material.dart'; class ImagePage extends StatefulWidget { @override State<StatefulWidget> createState() { return _ImagePageState(); } } class _ImagePageState extends State<ImagePage> { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('Test Application'), ), body: Container( child: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: [ Image.asset( 'image/flutter.png', width: 200, height: 200, fit: BoxFit.fill, ), Text( 'Hello Flutter', style: TextStyle( fontFamily: 'Pacifico', fontSize: 30, color: Colors.blue, ), ) ], ), ) ), ); } } |
▶ main.dart
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import 'package:flutter/material.dart'; import 'imagePage.dart'; void main() { runApp(TestApplication()); } class TestApplication extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Test Application', theme: ThemeData( primarySwatch: Colors.blue, ), home: ImagePage(), ); } } |
test_app.zip
[FLUTTER] Import 키워드 : 파일 임포트하기
■ Import 키워드를 사용해 파일을 임포트하는 방법을 보여준다. ▶ ImagePage.dart
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import 'package:flutter/material.dart'; class ImagePage extends StatefulWidget { @override State<StatefulWidget> createState() { return _ImagePageState(); } } class _ImagePageState extends State<ImagePage> { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('Test Application'), ), body: Container( child: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: [ Image.asset( 'image/flutter.png', width: 200, height: 200, fit: BoxFit.fill, ), ], ), ) ), ); } } |
▶ MainPage.dart
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import 'package:flutter/material.dart'; import 'imagePage.dart'; void main() { runApp(TestApplication()); } class TestApplication extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Test Application', theme: ThemeData( primarySwatch: Colors.blue, ), home: ImagePage(), ); } } |
test_app.zip
[FLUTTER] Image 클래스 : width/height/fit 속성 사용하기
■ Image 클래스의 width/height/fit 속성을 사용하는 방법을 보여준다. ▶ pubspec.yaml
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name: test_app description: A new Flutter application. publish_to: 'none' version: 1.0.0+1 environment: sdk: ">=2.7.0 <3.0.0" dependencies: flutter: sdk: flutter cupertino_icons: ^1.0.2 dev_dependencies: flutter_test: sdk: flutter flutter: uses-material-design: true assets: - image/flutter.png |
▶ ImagePage.dart
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import 'package:flutter/material.dart'; class ImagePage extends StatefulWidget { @override State<StatefulWidget> createState() { return _ImagePageState(); } } class _ImagePageState extends State<ImagePage> { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('Test Application'), ), body: Container( child: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: [ Image.asset( 'image/flutter.png', width: 200, height: 200, fit: BoxFit.fill, ), ], ), ) ), ); } } |
▶ MainPage.dart
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import 'package:flutter/material.dart'; import 'imagePage.dart'; void main() { runApp(TestApplication()); } class TestApplication extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Test Application', theme: ThemeData( primarySwatch: Colors.blue, ), home: ImagePage(), ); } } |
test_app.zip
[FLUTTER] TextStyle 클래스 사용하기
■ TextStyle 클래스를 사용하는 방법을 보여준다. ▶ 예제 코드 (DART)
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TextStyle( fontSize: 40.0, fontStyle: FontStyle.italic, fontWeight: FontWeight.bold, color: Colors.red, letterSpacing: 4.0, ) |
[FLUTTER] Text 클래스 : textAlign 속성을 사용해 수평 정렬하기
■ Text 클래스의 textAlign 속성을 사용해 수평 정렬하는 방법을 보여준다. ▶ 예제 코드 (DART)
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Text( 'hello\nFlutter', textAlign: TextAlign.center, ) |
[FLUTTER] ThemeData 클래스 : visualDensity 속성 사용하기
■ ThemeData 클래스의 visualDensity 속성을 사용하는 방법을 보여준다. ▶ 예제 코드 (DART)
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ThemeData( primarySwatch: Colors.blue, visualDensity: VisualDensity.adaptivePlatformDensity, ) |
[FLUTTER] 할 일 관리 앱 만들기 (파이어베이스 연동)
■ 할 일 관리 앱 만드는 방법을 보여준다. (파이어베이스 연동) 1. 웹 브라우저에서 아래 파이어베이스 웹사이트에 접속하고 구글 계정으로 로그인한다. ▶ URL
[FLUTTER] 할 일 관리 앱 만들기
■ 할 일 관리 앱을 만드는 방법을 보여준다. ▶ main.dart
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import 'package:flutter/material.dart'; void main() { runApp(TestApplication()); } class Todo { String title; bool isDone; Todo(this.title, {this.isDone = false}); } class TestApplication extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Test Application', theme: ThemeData( primarySwatch: Colors.blue, ), home: MainPage(), ); } } class MainPage extends StatefulWidget { @override _MainPageState createState() => _MainPageState(); } class _MainPageState extends State<MainPage> { final _itemList = <Todo>[]; var _todoController = TextEditingController(); @override void dispose() { _todoController.dispose(); super.dispose(); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('남은 할 일'), ), body: Padding( padding: const EdgeInsets.all(8.0), child: Column( children: <Widget>[ Row( children: <Widget>[ Expanded( child: TextField( controller: _todoController, ), ), RaisedButton( child: Text('추가'), onPressed: () => _addTodo(Todo(_todoController.text)), ), ], ), Expanded( child: ListView( children: _itemList.map((todo) => _buildItem(todo)).toList(), ), ), ], ), ), ); } Widget _buildItem(Todo todo) { return ListTile( title: Text( todo.title, style: todo.isDone ? TextStyle( decoration: TextDecoration.lineThrough, fontStyle: FontStyle.italic, ) : null, ), trailing: IconButton( icon: Icon(Icons.delete_forever), onPressed: () => _deleteTodo(todo), ), onTap: () => _toggleTodo(todo), ); } void _addTodo(Todo todo) { setState(() { _itemList.add(todo); _todoController.text = ""; }); } void _deleteTodo(Todo todo) { setState(() { _itemList.remove(todo); }); } void _toggleTodo(Todo todo) { setState(() { todo.isDone = !todo.isDone; }); } } |
test_app.zip
[FLUTTER] Timer 클래스 : periodic 팩토리 생성자 사용하기
■ Timer 클래스에서 periodic 팩토리 생성자를 사용하는 방법을 보여준다. ▶ main.dart
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import 'dart:async'; import 'package:flutter/material.dart'; void main() { runApp(TestApplication()); } class TestApplication extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Test Application', theme: ThemeData( primarySwatch: Colors.blue, ), home: MainPage(), ); } } class MainPage extends StatefulWidget { @override _MainPageState createState() => _MainPageState(); } class _MainPageState extends State<MainPage> { Timer _timer; bool _isRunning = false; int _timerCount = 0; String _buttonText = 'Start'; @override void dispose() { _timer?.cancel(); super.dispose(); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('Test Application'), ), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: [ RaisedButton( child: Text("$_buttonText"), color: Colors.orange, onPressed: () { _isRunning = !_isRunning; if (_isRunning) { setState(() { _timerCount = 0; _buttonText = 'Stop'; }); _timer = Timer.periodic(Duration(milliseconds: 10), (timer) { setState(() { _timerCount++; }); }); } else { _timer?.cancel(); setState(() { _buttonText = 'Start'; }); } }, ), Padding( padding: const EdgeInsets.only(top: 10.0), child: Text("$_timerCount"), ), ], ), ), ); } } |
test_app.zip
[FLUTTER] BottomAppBar 클래스 사용하기
■ BottomAppBar 클래스를 사용하는 방법을 보여준다. ▶ main.dart
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import 'package:flutter/material.dart'; void main() => runApp(TestApplication()); class TestApplication extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Test Application', theme: ThemeData( primarySwatch: Colors.blue, ), home: MainPage(), ); } } class MainPage extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('Test Application'), ), body: Container(), bottomNavigationBar: BottomAppBar( child: Container( height: 50.0, color: Colors.amber, ), ), floatingActionButton: FloatingActionButton( child: Icon(Icons.play_arrow), onPressed: () { }, ), floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked, ); } } |
test_app.zip
[FLUTTER] Positioned 클래스 사용하기
■ Positioned 클래스를 사용하는 방법을 보여준다. ▶ main.dart
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import 'package:flutter/material.dart'; void main() { runApp(TestApplication()); } class TestApplication extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Test Application', theme: ThemeData( primarySwatch: Colors.blue, ), home: MainPage(), ); } } class MainPage extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('Test Application'), ), body: Stack( children: [ Positioned( left: 100, top: 100, child: Container( color: Colors.red, width: 100, height: 100, padding: const EdgeInsets.all(8.0), margin: const EdgeInsets.all(8.0), ), ), Positioned( left: 150, top: 150, child: Container( color: Colors.blue, width: 100, height: 100, padding: const EdgeInsets.all(8.0), margin: const EdgeInsets.all(8.0), ), ), ] ), ); } } |
test_app.zip
[FLUTTER] 스톱워치(Stopwatch) 만들기
■ 스톱워치(Stopwatch)를 만드는 방법을 보여준다. ▶ main.dart
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import 'dart:async'; import 'package:flutter/material.dart'; void main() => runApp(TestApplication()); class TestApplication extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Test Application', theme: ThemeData( primarySwatch: Colors.blue, ), home: MainPage(), ); } } class MainPage extends StatefulWidget { MainPage({Key key}) : super(key: key); @override _MainPageState createState() => _MainPageState(); } class _MainPageState extends State<MainPage> { Timer _timer; int _timeCount = 0; bool _isRunning = false; List<String> _lapTimeList = []; @override void dispose() { _timer?.cancel(); super.dispose(); } Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('스톱워치'), ), body: _buildBody(), bottomNavigationBar: BottomAppBar( child: Container( height: 50.0, ), ), floatingActionButton: FloatingActionButton( child: _isRunning ? Icon(Icons.pause) : Icon(Icons.play_arrow), onPressed: () => setState(() { _clickPlayButton(); }), ), floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked, ); } Widget _buildBody() { int secondCount = _timeCount ~/ 100; String hundredthCount = '${_timeCount % 100}'.padLeft(2, '0'); return Center( child: Padding( padding: const EdgeInsets.only(top: 30), child: Stack( children: <Widget>[ Column( children: <Widget>[ Row( mainAxisAlignment: MainAxisAlignment.center, crossAxisAlignment: CrossAxisAlignment.end, children: <Widget>[ Text( '$secondCount', style: TextStyle(fontSize: 50.0), ), Text('$hundredthCount'), ], ), Container( width: 100, height: 200, child: ListView( children: _lapTimeList.map((time) => Text(time)).toList(), ), ) ], ), Positioned( left: 10, bottom: 10, child: FloatingActionButton( backgroundColor: Colors.deepOrange, onPressed: _clickResetButton, child: Icon(Icons.rotate_left), ), ), Positioned( right: 10, bottom: 10, child: RaisedButton( onPressed: () { setState(() { _recordLapTime('$secondCount.$hundredthCount'); }); }, child: Text('랩타임'), ), ) ], ), ), ); } void _start() { _timer = Timer.periodic(Duration(milliseconds: 10), (timer) { setState(() { _timeCount++; }); }); } void _pause() { _timer?.cancel(); } void _clickPlayButton() { _isRunning = !_isRunning; if (_isRunning) { _start(); } else { _pause(); } } void _clickResetButton() { setState(() { _isRunning = false; _timer?.cancel(); _lapTimeList.clear(); _timeCount = 0; }); } void _recordLapTime(String time) { _lapTimeList.insert(0, '${_lapTimeList.length + 1}등 $time'); } } |
test_app.zip
[FLUTTER] 비만도 계산기 만들기
■ 비만도 계산기를 만드는 방법을 보여준다. ▶ main.dart
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import 'package:flutter/material.dart'; void main() => runApp(TestApplication()); class TestApplication extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Test Application', theme: ThemeData( primarySwatch: Colors.blue, ), home: MainPage(), ); } } class MainPage extends StatefulWidget { @override _MainPageState createState() => _MainPageState(); } class _MainPageState extends State<MainPage> { final GlobalKey<FormState> _formKey = GlobalKey<FormState>(); final _heightController = TextEditingController(); final _weightController = TextEditingController(); @override void dispose() { _heightController.dispose(); _weightController.dispose(); super.dispose(); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(title: Text('비만도 계산기')), body: Container( padding: const EdgeInsets.all(16.0), child: Form( key: _formKey, child: Column( children: <Widget>[ TextFormField( decoration: InputDecoration( border: OutlineInputBorder(), hintText: '신장', ), controller: _heightController, keyboardType: TextInputType.number, validator: (value) { if (value.trim().isEmpty) { return '신장(cm)을 입력해 주시기 바랍니다.'; } return null; }, ), SizedBox( height: 16.0, ), TextFormField( decoration: InputDecoration( border: OutlineInputBorder(), hintText: '체중', ), controller: _weightController, keyboardType: TextInputType.number, validator: (value) { if (value.trim().isEmpty) { return '체중(kg)을 입력해 주시기 바랍니다.'; } return null; }, ), Container( margin: const EdgeInsets.only(top: 16.0), alignment: Alignment.centerRight, child: RaisedButton( onPressed: () { if (_formKey.currentState.validate()) { Navigator.push( context, MaterialPageRoute( builder: (context) => ResultPage( double.parse(_heightController.text.trim()), double.parse(_weightController.text.trim()), ), ), ); } }, child: Text('결과'), ), ) ], ), ), ), ); } } class ResultPage extends StatelessWidget { final double height; final double weight; ResultPage(this.height, this.weight); @override Widget build(BuildContext context) { final double bmi = weight / ((height / 100) * (height / 100)); return Scaffold( appBar: AppBar(title: Text('비만도 계산기')), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ Text( _getText(bmi), style: TextStyle(fontSize: 36), ), SizedBox( height: 16, ), _getIcon(bmi), ], ), ), ); } String _getText(double bmi) { String result = '저체중'; if (bmi >= 35) { result = '고도 비만'; } else if (bmi >= 30) { result = '2단계 비만'; } else if (bmi >= 25) { result = '1단계 비만'; } else if (bmi >= 23) { result = '과체중'; } else if (bmi >= 18.5) { result = '정상'; } return result; } Widget _getIcon(double bmi) { if (bmi >= 23) { return Icon( Icons.sentiment_very_dissatisfied, color: Colors.red, size: 100, ); } else if (bmi >= 18.5) { return Icon( Icons.sentiment_satisfied, color: Colors.green, size: 100, ); } else { return Icon( Icons.sentiment_dissatisfied, color: Colors.orange, size: 100, ); } } } |
test_app.zip
[FLUTTER] Opacity 클래스 : opacity 속성을 사용해 불투명도 표시하기
■ Opacity 클래스의 opacity 속성을 사용해 불투명도를 표시하는 방법을 보여준다. ▶ main.dart
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import 'package:flutter/material.dart'; void main() { runApp(TestApplication()); } class TestApplication extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Test Application', theme: ThemeData( primarySwatch: Colors.blue, ), home: MainPage(), ); } } class MainPage extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('Test Application'), ), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: [ Opacity( opacity: 0.3, child: Container( color: Colors.red, width: 100, height: 100, padding: const EdgeInsets.all(8.0), margin: const EdgeInsets.all(8.0), ), ), Opacity( opacity: 0.6, child: Container( color: Colors.red, width: 100, height: 100, padding: const EdgeInsets.all(8.0), margin: const EdgeInsets.all(8.0), ), ), Opacity( opacity: 0.9, child: Container( color: Colors.red, width: 100, height: 100, padding: const EdgeInsets.all(8.0), margin: const EdgeInsets.all(8.0), ), ), ], ), ), ); } } |
test_app.zip
[FLUTTER] ScaffoldState 클래스 : showSnackBar 메소드를 사용해 스낵바 표시하기
■ ScaffoldState 클래스의 showSnackBar 메소드를 사용해 스낵바를 표시하는 방법을 보여준다. ▶ main.dart
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import 'package:flutter/material.dart'; void main() => runApp(TestApplication()); class TestApplication extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Test Application', home: Scaffold( appBar: AppBar( title: Text('Test Application'), ), body: MainPage(), ), ); } } class MainPage extends StatefulWidget { @override _MainPageState createState() => _MainPageState(); } class _MainPageState extends State<MainPage> { final GlobalKey<FormState> _formKey = GlobalKey<FormState>(); @override Widget build(BuildContext context) { return Padding( padding: const EdgeInsets.all(16.0), child: Form( key: _formKey, child: Column( crossAxisAlignment: CrossAxisAlignment.start, children: <Widget>[ TextFormField( validator: (value) { if (value.isEmpty) { return '주소를 입력해 주시기 바랍니다.'; } return null; }, ), Padding( padding: const EdgeInsets.symmetric(vertical: 16.0), child: RaisedButton( child: Text('검증'), onPressed: () { if (_formKey.currentState.validate()) { Scaffold.of(context).showSnackBar(SnackBar(content: Text('정상적으로 입력되었습니다.'))); } }, ), ), ], ), ), ); } } |
[FLUTTER] TextFormField 클래스 : validator 속성을 사용해 입력 값 검증하기
■ TextFormField 클래스의 validator 속성을 사용해 입력 값을 검증하는 방법을 보여준다. ▶ main.dart
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import 'package:flutter/material.dart'; void main() => runApp(TestApplication()); class TestApplication extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Test Application', home: Scaffold( appBar: AppBar( title: Text('Test Application'), ), body: MainPage(), ), ); } } class MainPage extends StatefulWidget { @override _MainPageState createState() => _MainPageState(); } class _MainPageState extends State<MainPage> { final GlobalKey<FormState> _formKey = GlobalKey<FormState>(); @override Widget build(BuildContext context) { return Padding( padding: const EdgeInsets.all(16.0), child: Form( key: _formKey, child: Column( crossAxisAlignment: CrossAxisAlignment.start, children: <Widget>[ TextFormField( validator: (value) { if (value.isEmpty) { return '주소를 입력해 주시기 바랍니다.'; } return null; }, ), Padding( padding: const EdgeInsets.symmetric(vertical: 16.0), child: RaisedButton( child: Text('검증'), onPressed: () { if (_formKey.currentState.validate()) { Scaffold.of(context).showSnackBar(SnackBar(content: Text('정상적으로 입력되었습니다.'))); } }, ), ), ], ), ), ); } } |
[FLUTTER] Form 클래스 : 입력 값 검증하기
■ Form 클래스에서 입력 값을 검증하는 방법을 보여준다. ▶ main.dart
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import 'package:flutter/material.dart'; void main() => runApp(TestApplication()); class TestApplication extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Test Application', home: Scaffold( appBar: AppBar( title: Text('Test Application'), ), body: MainPage(), ), ); } } class MainPage extends StatefulWidget { @override _MainPageState createState() => _MainPageState(); } class _MainPageState extends State<MainPage> { final GlobalKey<FormState> _formKey = GlobalKey<FormState>(); @override Widget build(BuildContext context) { return Padding( padding: const EdgeInsets.all(16.0), child: Form( key: _formKey, child: Column( crossAxisAlignment: CrossAxisAlignment.start, children: <Widget>[ TextFormField( validator: (value) { if (value.isEmpty) { return '주소를 입력해 주시기 바랍니다.'; } return null; }, ), Padding( padding: const EdgeInsets.symmetric(vertical: 16.0), child: RaisedButton( child: Text('검증'), onPressed: () { if (_formKey.currentState.validate()) { Scaffold.of(context).showSnackBar(SnackBar(content: Text('정상적으로 입력되었습니다.'))); } }, ), ), ], ), ), ); } } |
test_app.zip
[FLUTTER] TextEditingController 클래스 사용하기
■ TextEditingController 클래스를 사용하는 방법을 보여준다. ▶ main.dart
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import 'package:flutter/material.dart'; void main() => runApp(TestApplication()); class TestApplication extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Test Application', home: MainPage(), ); } } class MainPage extends StatefulWidget { @override _MainPageState createState() => _MainPageState(); } class _MainPageState extends State<MainPage> { final controller = TextEditingController(); @override void initState() { super.initState(); controller.addListener(_printLatestValue); } @override void dispose() { controller.dispose(); super.dispose(); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('Test Application'), ), body: Padding( padding: const EdgeInsets.all(16.0), child: Column( children: <Widget>[ TextField( onChanged: (text) { print("첫 번째 텍스트 필드 : $text"); }, ), TextField( controller: controller, ), ], ), ), ); } _printLatestValue() { print("두 번째 텍스트 필드 : ${controller.text}"); } } |
test_app.zip
[FLUTTER] CarouselSlider 클래스 : 자동 스크롤 슬라이더 사용하기
■ CarouselSlider 클래스에서 자동 스크롤 슬라이더를 사용하는 방법을 보여준다. ▶ pubspec.yaml
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name: test_app description: A new Flutter application. publish_to: 'none' version: 1.0.0+1 environment: sdk: ">=2.7.0 <3.0.0" dependencies: flutter: sdk: flutter cupertino_icons: ^1.0.2 carousel_slider: ^3.0.0 dev_dependencies: flutter_test: sdk: flutter flutter: uses-material-design: true assets: - assets/image1.jpg - assets/image2.jpg - assets/image3.jpg |
▶ main.dart
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import 'package:flutter/material.dart'; import 'package:carousel_slider/carousel_slider.dart'; final imageList = [ Image.asset('assets/image1.jpg', fit: BoxFit.cover), Image.asset('assets/image2.jpg', fit: BoxFit.cover), Image.asset('assets/image3.jpg', fit: BoxFit.cover), ]; void main() { runApp(TestApplication()); } class TestApplication extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Test Application', theme: ThemeData( primarySwatch: Colors.blue, ), home: MainPage(), ); } } class MainPage extends StatefulWidget { @override _MainPageState createState() => _MainPageState(); } class _MainPageState extends State<MainPage> { int _index = 0; List<StatelessWidget> _pageList = [ HomePage(), ServicePage(), ProfilePage(), ]; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( backgroundColor: Colors.white, centerTitle: true, title: Text( 'Test Application', style: TextStyle(color: Colors.black), ), actions: <Widget>[ IconButton( icon: Icon( Icons.add, color: Colors.black, ), onPressed: () {}, ), ], ), body: _pageList[_index], bottomNavigationBar: BottomNavigationBar( items: [ BottomNavigationBarItem( icon: Icon(Icons.home), label: 'Home', ), BottomNavigationBarItem( icon: Icon(Icons.assignment), label: 'Service', ), BottomNavigationBarItem( icon: Icon(Icons.account_circle), label: 'Profiles', ), ], onTap: (index) { setState(() { _index = index; }); }, ), ); } } class HomePage extends StatelessWidget { @override Widget build(BuildContext context) { return ListView( children: <Widget>[ _buildTop(), _buildMiddle(), _buildBottom(), ], ); } Widget _buildTop() { return Padding( padding: const EdgeInsets.only(top: 20, bottom: 20), child: Column( children: [ Row( mainAxisAlignment: MainAxisAlignment.spaceEvenly, children: [ GestureDetector( child: Column( children: <Widget>[ Icon( Icons.local_taxi, size: 40, ), Text('자동차1'), ], ), onTap: () { print('자동차1 클릭'); }, ), GestureDetector( child: Column( children: <Widget>[ Icon( Icons.local_taxi, size: 40, ), Text('자동차2'), ], ), onTap: () { print('자동차2 클릭'); }, ), GestureDetector( child: Column( children: <Widget>[ Icon( Icons.local_taxi, size: 40, ), Text('자동차3'), ], ), onTap: () { print('자동차3 클릭'); }, ), GestureDetector( child: Column( children: <Widget>[ Icon( Icons.local_taxi, size: 40, ), Text('자동차4'), ], ), onTap: () { print('자동차4 클릭'); }, ), ], ), SizedBox( height: 20, ), Row( mainAxisAlignment: MainAxisAlignment.spaceEvenly, children: [ GestureDetector( child: Column( children: <Widget>[ Icon( Icons.local_taxi, size: 40, ), Text('자동차5'), ], ), onTap: () { print('자동차5 클릭'); }, ), GestureDetector( child: Column( children: <Widget>[ Icon( Icons.local_taxi, size: 40, ), Text('자동차6'), ], ), onTap: () { print('자동차6 클릭'); }, ), GestureDetector( child: Column( children: <Widget>[ Icon( Icons.local_taxi, size: 40, ), Text('자동차7'), ], ), onTap: () { print('자동차7 클릭'); }, ), Opacity( opacity: 0.0, child: Column( children: <Widget>[ Icon( Icons.local_taxi, size: 40, ), Text('자동차8'), ], ), ), ], ), ], ), ); } Widget _buildMiddle() { return CarouselSlider( options: CarouselOptions(height: 150.0, autoPlay: true), items: imageList.map((image) { return Builder( builder: (BuildContext context) { return Container( width: MediaQuery.of(context).size.width, margin: EdgeInsets.symmetric(horizontal: 5.0), child: ClipRRect( borderRadius: BorderRadius.circular(10.0), child: image, ), ); }, ); }).toList(), ); } Widget _buildBottom() { final _itemList = List.generate(10, (i) { return ListTile( leading: Icon(Icons.notifications_none), title: Text('[이벤트] 공지 사항이 있습니다.'), ); }); return ListView( physics: NeverScrollableScrollPhysics(), shrinkWrap: true, children: _itemList, ); } } class ServicePage extends StatelessWidget { @override Widget build(BuildContext context) { return Center( child: Text( 'Service', style: TextStyle(fontSize: 40), ), ); } } class ProfilePage extends StatelessWidget { @override Widget build(BuildContext context) { return Center( child: Text( 'Profile', style: TextStyle(fontSize: 40), ), ); } } |
test_app.zip
[FLUTTER] Navigator 클래스 : pushNamed 정적 메소드를 사용해 화면 이동하기
■ Navigator 클래스의 pushNamed 정적 메소드를 사용해 화면을 이동하는 방법을 보여준다. ▶ person.dart
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class Person { String name; int age; Person(this.name, this.age); } |
▶ detail_page.dart
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import 'package:flutter/material.dart'; import 'package:test_app/person.dart'; class DetailPage extends StatelessWidget { @override Widget build(BuildContext context) { final Person person = ModalRoute.of(context).settings.arguments; return Scaffold( appBar: AppBar( title: Text('Test Application / Detail Page'), ), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ Text( '${person.name}, ${person.age}' ), SizedBox( height: 10, ), RaisedButton( child: Text('메인 페이지'), color: Colors.orange, onPressed: () { Navigator.pop(context, 'OK'); }, ) ], ), ), ); } } |
▶ main_page.dart
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import 'package:flutter/material.dart'; import 'package:test_app/person.dart'; import 'package:test_app/detail_page.dart'; class MainPage extends StatefulWidget { @override _MainPageState createState() => _MainPageState(); } class _MainPageState extends State<MainPage> { String _result; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('Test Application / Main Page'), ), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ RaisedButton( child: Text('상세 페이지'), color: Colors.orange, onPressed: () async { setState(() { _result = ''; }); final Person person = Person('홍길동', 20); final result = await Navigator.pushNamed( context, '/detail', arguments: person, ); setState(() { _result = result; }); }, ), Text( '결과 : $_result', ), ], ), ), ); } } |
▶ main.dart