Transparent Appbar With Full Screen Image In Flutter

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
        home: Scaffold(
            body: Page()
        )
    );
  }
}

class Page extends StatefulWidget {

  PageState createState() => PageState();

}

class PageState extends State<Page>{

  final controller = PageController(
    initialPage: 0,
  );

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        children: <Widget>[
          Container(
            decoration: BoxDecoration(
              image: DecorationImage(
                image: AssetImage('assets/images/2.jpg'),
                fit: BoxFit.cover,
              ),
            ),
            child: Center(
              child: Text(
                'BajarangiSoft.com',
                style: TextStyle(
                  color: Colors.white,
                  fontSize: 30,
                ),
              ),
            ),
          ),
          Positioned(
            child: AppBar(
              leading: Icon(Icons.chevron_left),
              title: Text("Transparent AppBar"),
              backgroundColor: Colors.transparent,
              elevation: 0,
              actions: <Widget>[
                IconButton(
                  icon: Icon(Icons.notifications_none),
                  onPressed: () {},
                  tooltip: 'notification',
                ),
              ],
            ),
          )
        ],
      ),
    );
  }
}