How to show or hide DropdownButton on button click in Flutter

In this Google flutter code example we are going to learn how to show or hide DropDownButton on button click in Flutter.

The code is based on flutter version 1.0.0

Main.dart (App entry point)

import 'package:flutter/material.dart';
import 'week2/show_hide_dropdownbutton.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        // This is the theme of your application.
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
      //home: MyHomePage(title: 'Flutter Demo Home Page'),
      home: ShowHideDropdown(),


import 'package:flutter/material.dart';

class ShowHideDropdown extends StatefulWidget {
  ShowHideDropdownState createState() {
    return new ShowHideDropdownState();

class ShowHideDropdownState extends State<ShowHideDropdown> {
  final List<String> _dropdownValues = [
  ]; //The list of values we want on the dropdown

  String _selectedValue = "";
  bool _isDropdownVisible = true;

  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Show and Hide - DropdownButton'),
      body: Center(
        child: Column(
          mainAxisSize: MainAxisSize.max,
          children: <Widget>[
                ? DropdownButton<String>(
                    items: _dropdownValues
                        .map((data) => DropdownMenuItem<String>(
                              child: Text(data),
                              value: data,
                    onChanged: (String value) {
                      setState(() => _selectedValue = value);
                    hint: Text('Dropdown'),
                : SizedBox(),
              height: 25.0,
              child: Text(_isDropdownVisible ? "Hide" : "Show"),
              onPressed: () {
                setState(() => _isDropdownVisible = !_isDropdownVisible);

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