import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('DropdownButton 예제'),
        ),
        body: Center(
          child: _buildDropdownButton(),
        ),
      ),
    );
  }

  Widget _buildDropdownButton() {
    return DropdownButton<String>(
      value: 'One',
      items: <String>['One', 'Two', 'Three', 'Four']
          .map<DropdownMenuItem<String>>((String value) {
        return DropdownMenuItem<String>(
          value: value,
          child: Text(value),
        );
      }).toList(),
      onChanged: (String? newValue) {
        // Do something with the selected value
      },
    );
  }
}