// Copyright 2014 The Flutter Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. // Flutter code sample for DropdownButton import 'package:flutter/material.dart'; void main() => runApp(const MyApp()); class MyApp extends StatelessWidget { const MyApp({Key? key}) : super(key: key); static const String _title = 'Flutter Code Sample'; @override Widget build(BuildContext context) { return MaterialApp( title: _title, home: Scaffold( appBar: AppBar(title: const Text(_title)), body: const Center( child: MyStatefulWidget(), ), ), ); } } class MyStatefulWidget extends StatefulWidget { const MyStatefulWidget({Key? key}) : super(key: key); @override State<MyStatefulWidget> createState() => _MyStatefulWidgetState(); } class _MyStatefulWidgetState extends State<MyStatefulWidget> { String dropdownValue = 'One'; @override Widget build(BuildContext context) { return DropdownButton<String>( value: dropdownValue, icon: const Icon(Icons.arrow_downward), elevation: 16, style: const TextStyle(color: Colors.deepPurple), underline: Container( height: 2, color: Colors.deepPurpleAccent, ), onChanged: (String? newValue) { setState(() { dropdownValue = newValue!; }); }, items: <String>['One', 'Two', 'Free', 'Four'] .map<DropdownMenuItem<String>>((String value) { return DropdownMenuItem<String>( value: value, child: Text(value), ); }).toList(), ); } }