Flutter transparent AppBar

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Transparent AppBar',
      debugShowCheckedModeBanner: false,
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        children: <Widget>[
          Container(
            //color: Colors.orange,
            decoration: BoxDecoration(
              image: DecorationImage(
                // Replace this image with an image you have... and don't forget to declare it in pubspec.yaml
                image: AssetImage("assets/evan-kirby-226482-unsplash.jpg"),
                fit: BoxFit.cover,
              ),
            ),
            child: Center(
              child: Text("Hello World!\nwith transparent AppBar...", style: TextStyle(fontSize: 18.0, color: Colors.white))
            ),
          ),
          AppBar(
            backgroundColor: Colors.transparent,
            elevation: 0.0,
            leading: IconButton(
              icon: Icon(
                Icons.arrow_back_ios,
              ),
              color: Colors.white,
              onPressed: () {},
            ),
            title: Text("Transparent AppBar"),
            actions: <Widget>[
              IconButton(
                icon: Icon(
                  Icons.menu,
                ),
                color: Colors.white,
                onPressed: () {},
              ),
            ],
          )
        ]
      )
    );
  }
}