How To Set Up Dropdown Menu With Flutter Android App

 DropdownButton(
  items: _dropdownValues
      .map((value) => DropdownMenuItem(
    child: Text(value),
    value: value,
  ))
      .toList(),
  onChanged: (String value) {},
  isExpanded: false,
  hint: Text('Select Item',style: TextStyle(
    fontSize: 30,
        color: Colors.black
  ),),
),

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: DropDown()
    );
  }
}

class DropDown extends StatefulWidget {
  @override
  DropDownWidget createState() => DropDownWidget();
}

class DropDownWidget extends State {

  final List<String> _dropdownValues = [
    "Apple",
    "LG",
    "NOkic",
    "Samsung",
    "Moto"
  ]; //

  @override

  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        centerTitle: true,
        backgroundColor: Colors.black,
        title: Text('Select Item From DropDown'),
      ),
      body: Center(
        child: DropdownButton(
          items: _dropdownValues
              .map((value) => DropdownMenuItem(
            child: Text(value),
            value: value,
          ))
              .toList(),
          onChanged: (String value) {},
          isExpanded: false,
          hint: Text('Select Item',style: TextStyle(
            fontSize: 20,
                color: Colors.black
          ),),
        ),
      ),
    );
  }
}