Dropdown

sample.packages.flutter.lib.src.material.dropdown.1011.

This sample shows a DropdownButton with a button with [Text] that corresponds to but is unique from [DropdownMenuItem].

  
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 MyStatefulWidget(),
      ),
    );
  }
}

class MyStatefulWidget extends StatefulWidget {
  const MyStatefulWidget({Key? key}) : super(key: key);

  @override
  State createState() => _MyStatefulWidgetState();
}

class _MyStatefulWidgetState extends State {
  final List items = ['1', '2', '3'];
  String selectedItem = '1';

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 12.0),
      child: DropdownButton(
        value: selectedItem,
        onChanged: (String? string) => setState(() => selectedItem = string!),
        selectedItemBuilder: (BuildContext context) {
          return items.map((String item) {
            return Text(item);
          }).toList();
        },
        items: items.map((String item) {
          return DropdownMenuItem(
            value: item,
            child: Text('Log $item'),
          );
        }).toList(),
      ),
    );
  }
}