COmplete Code For DropDown TextField In Flutter
import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { // This widget is the root of your application. @override Widget build(BuildContext context) { return MaterialApp( debugShowCheckedModeBanner: false, title: 'Flutter Demo', home: MyHomePage(), ); } } class MyHomePage extends StatefulWidget { MyHomePage({Key key, this.title}) : super(key: key); final String title; @override _MyHomePageState createState() => _MyHomePageState(); } class _MyHomePageState extends State<MyHomePage> { String dropdownValue= 'A'; @override Widget build(BuildContext context) { var currentSelectedValue; const deviceTypes = ["Mac", "Windows", "Mobile"]; return Scaffold( appBar: AppBar( centerTitle: true, backgroundColor: Colors.pink, title: Text('DropDown TextField'), ), body: Padding( padding: const EdgeInsets.all(15.0), child: Container( height: 60, child: Container( padding: EdgeInsets.symmetric(horizontal: 3), child: FormField<String>( builder: (FormFieldState<String> state) { return InputDecorator( decoration: InputDecoration( border: OutlineInputBorder( borderRadius: BorderRadius.circular(5.0))), child: DropdownButtonHideUnderline( child: DropdownButton<String>( hint: Text("Dropdown"), value: currentSelectedValue, isDense: true, onChanged: (newValue) { setState(() { currentSelectedValue = newValue; }); print(currentSelectedValue); }, items: deviceTypes.map((String value) { return DropdownMenuItem<String>( value: value, child: Text(value), ); }).toList(), ), ), ); }, ), ), ), ), ); } }