How to Show and Hide Button in Flutter

The sample Google flutter code below illustrate how to show and hide button in flutter.

The code is based on flutter version 1.0.0

Main.dart (App entry point)

import 'package:flutter/material.dart';
import 'show_hide_button.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  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 Colors.green 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.
        primarySwatch: Colors.blue,
      ),
      //home: MyHomePage(title: 'Flutter Demo Home Page'),
      home: ShowHideButton(),
    );
  }
}
show_hide_button.dart
import 'package:flutter/material.dart';

class ShowHideButton extends StatefulWidget {
  @override
  ShowHideButtonState createState() {
    return new ShowHideButtonState();
  }
}

class ShowHideButtonState extends State<ShowHideButton> {
  //boolean value to determine whether toshow or hide button. `true` by default
  bool _canShowButton = true;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Show & Hide Button Example'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          mainAxisSize: MainAxisSize.max,
          children: <Widget>[
            Expanded(
              child: Center(
                child: _canShowButton
                    ? RaisedButton(
                        color: Colors.red,
                        child: Text('A Button'),
                        onPressed: () {},
                      )
                    : SizedBox(),
              ),
            ),
            FlatButton(
              child: Text(_canShowButton ? 'Hide Button' : 'Show Button'),
              onPressed: () {
                setState(() => _canShowButton = !_canShowButton);
              },
            )
          ],
        ),
      ),
    );
  }
}

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