Programming Mobile app with Flutter

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // TRY THIS: Try running your application with "flutter run". You'll see
        // the application has a purple toolbar. Then, without quitting the app,
        // try changing the seedColor in the colorScheme below to Colors.green
        // and then invoke "hot reload" (save your changes or press the "hot
        // reload" button in
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        // a Flutter-supported IDE, or press "r" if you used
        // the command line to start the app).
        //
        // Notice that the counter didn't reset back to zero; the application
        // state is not lost during the reload. To reset the state, use hot
        // restart instead.
        //
        // This works for code too, not just values: Most code changes can be
        // tested with just a hot reload.
        colorScheme: .fromSeed(seedColor: Colors.deepPurple),
      ),
      home: const MyHomePage(title: 'ssssssssss'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {

    return Scaffold(
      appBar: AppBar(

        backgroundColor: Theme.of(context).colorScheme.inversePrimary,

        title: Text('ssssssss5587455'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: .center,
          children: [
             //สร้าง object เพื่อแสดงผลตรงนี้
            
          ],
        ),
      ),

    );
  }
}

 body: Center(
        child: Column(
          mainAxisAlignment: .center,
          children: [
             //สร้าง object เพื่อแสดงผลตรงนี้
             //เอาภาพจาก url มาลงในแอพใช้คำสั่งนี้
             Image.network('https://media.wired.com/photos/6423826d7f6ce88e606d7b55/3:2/w_2560%2Cc_limit/Lamborghini-Revuelto-Featured-Gear.jpg'),
            
          ],
        ),
      ),

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // TRY THIS: Try running your application with "flutter run". You'll see
        // the application has a purple toolbar. Then, without quitting the app,
        // try changing the seedColor in the colorScheme below to Colors.green
        // and then invoke "hot reload" (save your changes or press the "hot
        // reload" button in
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        // a Flutter-supported IDE, or press "r" if you used
        // the command line to start the app).
        //
        // Notice that the counter didn't reset back to zero; the application
        // state is not lost during the reload. To reset the state, use hot
        // restart instead.
        //
        // This works for code too, not just values: Most code changes can be
        // tested with just a hot reload.
        colorScheme: .fromSeed(seedColor: Colors.deepPurple),
      ),
      home: const MyHomePage(title: 'ssssssssss'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {

    return Scaffold(
      appBar: AppBar(

        backgroundColor: Theme.of(context).colorScheme.inversePrimary,

        title: Text('ssssssss5587455'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: .center,
          children: [
             //สร้าง object เพื่อแสดงผลตรงนี้
             //เอาภาพจาก url มาลงในแอพใช้คำสั่งนี้
             Image.network('https://media.wired.com/photos/6423826d7f6ce88e606d7b55/3:2/w_2560%2Cc_limit/Lamborghini-Revuelto-Featured-Gear.jpg'),
            //เรียกรูปใน folder image แต่ต้องเปิด pubspec.yaml ด้วย
            Image.asset('images/car.png'),
            Text('Welcome my world'),
          ],
        ),
      ),

    );
  }
}

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      debugShowCheckedModeBanner: false,
      home: BMIPage(),
    );
  }
}

class BMIPage extends StatefulWidget {
  const BMIPage({super.key});

  @override
  State<BMIPage> createState() => _BMIPageState();
}

class _BMIPageState extends State<BMIPage> {
  final TextEditingController weightController =
  TextEditingController();

  final TextEditingController heightController =
  TextEditingController();

  double bmi = 0;
  String result = '';

  void calculateBMI() {
    double weight =
        double.tryParse(weightController.text) ?? 0;

    double heightCm =
        double.tryParse(heightController.text) ?? 0;

    if (weight <= 0 || heightCm <= 0) {
      return;
    }

    double heightM = heightCm / 100;

    double bmiValue =
        weight / (heightM * heightM);

    String status;

    if (bmiValue < 18.5) {
      status = 'ผอม';
    } else if (bmiValue < 25) {
      status = 'ปกติ';
    } else {
      status = 'อ้วน';
    }

    setState(() {
      bmi = bmiValue;
      result = status;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('BMI Calculator'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment:
          CrossAxisAlignment.stretch,
          children: [

            const Text(
              'น้ำหนัก (กิโลกรัม)',
              style: TextStyle(fontSize: 18),
            ),

            const SizedBox(height: 8),

            TextField(
              controller: weightController,
              keyboardType:
              TextInputType.number,
              decoration:
              const InputDecoration(
                border: OutlineInputBorder(),
                hintText: 'เช่น 70',
              ),
            ),

            const SizedBox(height: 16),

            const Text(
              'ส่วนสูง (เซนติเมตร)',
              style: TextStyle(fontSize: 18),
            ),

            const SizedBox(height: 8),

            TextField(
              controller: heightController,
              keyboardType:
              TextInputType.number,
              decoration:
              const InputDecoration(
                border: OutlineInputBorder(),
                hintText: 'เช่น 170',
              ),
            ),

            const SizedBox(height: 24),

            ElevatedButton(
              onPressed: calculateBMI,
              child: const Text(
                'คำนวณ BMI',
              ),
            ),

            const SizedBox(height: 24),

            if (bmi > 0)
              Card(
                child: Padding(
                  padding:
                  const EdgeInsets.all(16),
                  child: Column(
                    children: [
                      Text(
                        'BMI = ${bmi.toStringAsFixed(2)}',
                        style:
                        const TextStyle(
                          fontSize: 24,
                          fontWeight:
                          FontWeight.bold,
                        ),
                      ),

                      const SizedBox(
                          height: 10),

                      Text(
                        result,
                        style:
                        const TextStyle(
                          fontSize: 22,
                          color: Colors.blue,
                        ),
                      ),
                    ],
                  ),
                ),
              ),
          ],
        ),
      ),
    );
  }
}