`import 'package:flutter/material.dart';
/// Flutter code sample for [DropdownMenu].
const List<String> list = <String>['One', 'Two', 'Three', 'Four'];
void main() => runApp(const DropdownMenuApp());
class DropdownMenuApp extends StatelessWidget {
const DropdownMenuApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData(useMaterial3: true),
home: Scaffold(
appBar: AppBar(title: const Text('DropdownMenu Sample')),
body: const Center(
child: DropdownMenuExample(),
),
),
);
}
}
class DropdownMenuExample extends StatefulWidget {
const DropdownMenuExample({super.key});
@override
State<DropdownMenuExample> createState() => _DropdownMenuExampleState();
}
class _DropdownMenuExampleState extends State<DropdownMenuExample> {
String dropdownValue = list.first;
@override
Widget build(BuildContext context) {
return DropdownMenu<String>(
initialSelection: list.first,
onSelected: (String? value) {
// This is called when the user selects an item.
setState(() {
dropdownValue = value!;
});
},
dropdownMenuEntries: list.map<DropdownMenuEntry<String>>((String value) {
return DropdownMenuEntry<String>(value: value, label: value);
}).toList(),
);
}
}
`
ref : https://api.flutter.dev/flutter/material/DropdownButton-class.html
