How To Add Scaffold Widget Code Using Flutter Android App

import 'package:flutter/material.dart';
void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: ThemeData.light().copyWith(primaryColor: Colors.deepOrange),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  final String title;
  MyHomePage({this.title});
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      key: _scaffoldKey,
      appBar: AppBar(
        backgroundColor: Colors.red,
          title: Text("Scaffold Widget")),
      drawer: Drawer(),
      bottomNavigationBar: BottomAppBar(
        color: Colors.red,
        child: Container(height: 50.0),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          _scaffoldKey.currentState.showSnackBar(SnackBar(
            content: Text("Snakbar displayed"),
            action: SnackBarAction(
              label: "Go Back",
              onPressed: () {
                if (Navigator.of(context).canPop()) {
                  Navigator.of(context).pop();
                }
              },
            ),
          ));
        },
        child: Icon(Icons.favorite,color: Colors.white,),
      ),
      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
      backgroundColor: Colors.red,
    );
  }
}