Simple Drawer

main.dart

import 'package:flutter/material.dart';

import './pages/home_page.dart';

void main() {
  runApp(new MaterialApp(
    home: new HomePage()
  ));
}

We've created pages directory in our Flutter app to store our dart pages

home_page.dart

import 'package:flutter/material.dart';

import './other_page.dart';

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => new _HomePageState();
}

class _HomePageState extends State<HomePage>{

  String mainProfilePicture = "https://randomuser.me/api/portraits/women/44.jpg";
  String otherProfilePicture = "https://randomuser.me/api/portraits/women/47.jpg";

  void switchUser(){
    String backupString = mainProfilePicture;
    this.setState((){
      mainProfilePicture = otherProfilePicture;
      otherProfilePicture = backupString;
    });
  }

  @override
  Widget build(BuildContext context){
    return new Scaffold(
      appBar: new AppBar(title: new Text("My Drawer App"),
      backgroundColor: Colors.redAccent,
      ),
      drawer: new Drawer(
        child: new ListView(
          children: <Widget>[
            new UserAccountsDrawerHeader(
              accountName: new Text("Raunak Hajela"),
              accountEmail: new Text("[e-mail]"),
              currentAccountPicture: new GestureDetector(
                onTap: () => switchUser(),
                child: new CircleAvatar(
                  backgroundImage: new NetworkImage(mainProfilePicture)
                ),
              ),
              otherAccountsPictures: <Widget>[
                new GestureDetector(
                  onTap: () => print("this is the other user"),
                  child: new CircleAvatar(
                    backgroundImage: new NetworkImage(otherProfilePicture)
                  ),
                ),
              ],
              decoration: new BoxDecoration(
                image: new DecorationImage(
                  fit: BoxFit.fill,
                  image: new NetworkImage("https://orig00.deviantart.net/20eb/f/2015/030/6/f/_minflat__dark_material_design_wallpaper__4k__by_dakoder-d8fjqzu.jpg")
                )
              )
            ),
            new ListTile(
              title: new Text("First Page"),
              trailing: new Icon(Icons.arrow_upward),
              onTap: () {
                Navigator.of(context).pop();
                Navigator.of(context).push(new MaterialPageRoute(builder: (BuildContext context) => new OtherPage("First Page")));
              }
            ),
            new ListTile(
              title: new Text("Second Page"),
              trailing: new Icon(Icons.arrow_right),
              onTap: () {
                Navigator.of(context).pop();
                Navigator.of(context).push(new MaterialPageRoute(builder: (BuildContext context) => new OtherPage("Second Page")));
              }
            ),
            new Divider(),
            new ListTile(
              title: new Text("Close"),
              trailing: new Icon(Icons.cancel),
              onTap: () => Navigator.of(context).pop(),
            )
          ],
        ),
      ),
      body: new Center(
        child: new Text("HomePage", style: new TextStyle(fontSize: 35.0))
      )
    );
  }
}

/**********************************************
***************Important Notes*****************
**********************************************/

//onTap: () => print("this is the other user")
// use this to display log messages on tap

other_page.dart

import 'package:flutter/material.dart';

class OtherPage extends StatelessWidget{

  final String pageText;

  OtherPage(this.pageText);

  @override
  Widget build(BuildContext context){
    return new Scaffold(
      appBar: new AppBar(title: new Text(pageText)),
      body: new Center(
        child: new Text(pageText),
      ),
    );
  }
}