■ 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, ); } } } |
