How To Change The Drawer Hamburger Icon Using Flutter App

import 'package:flutter/material.dart';

void main(){
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: MyHomePage(),
    );
  }
}

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

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      key: _scaffoldKey,
      appBar: AppBar(
        leading: IconButton(
          icon: Icon(Icons.person, color: Colors.white,size: 22),
          onPressed: () {
            _scaffoldKey.currentState.openDrawer();
          },
        ),
        backgroundColor: Colors.red[800],
        title: Text("Change Hamburger Icon",style: TextStyle(
          fontSize: 15
        ),),
      ),
      drawer: Container(
        width: 200,
        child: Drawer(
          child: Container(
            color: Colors.red[800],
            child: ListView(
              padding: EdgeInsets.all(10.0),
              children: [
                ListTile(
                  leading: Icon(Icons.home, color: Colors.white,),
                  title: Text('Home',style: TextStyle(color: Colors.white),),
                ),
                ListTile(
                  leading: Icon(Icons.person, color: Colors.white,),
                  title: Text('Profile',style: TextStyle(color: Colors.white),),
                ),
                ListTile(
                  leading: Icon(Icons.help_outline, color: Colors.white,),
                  title: Text('Help',style: TextStyle(color: Colors.white),),
                ),
              ],
            ),
          ),
        ),
      ),
      body: Center(
        child: Text("Home Screen"),
      ),
    );
  }
}