how to set drawer in app bar in flutter code example

Example 1: app drawer in flutter

class navigationDrawer extends StatelessWidget {
 @override
 Widget build(BuildContext context) {
   return Drawer(
     child: ListView(
       padding: EdgeInsets.zero,
       children: <Widget>[
         createDrawerHeader(),
         createDrawerBodyItem(
           icon: Icons.home,text: 'Home'),
         createDrawerBodyItem(
           icon: Icons.account_circle,text: 'Profile'),

         createDrawerBodyItem(
           icon: Icons.event_note,text: 'Events'),
         Divider(),
         createDrawerBodyItem(
           icon: Icons.notifications_active,text: 'Notifications'),
         createDrawerBodyItem(
           icon: Icons.contact_phone,text: 'Contact Info'),
         ListTile(
           title: Text('App version 1.0.0'),
           onTap: () {},
         ),
       ],
     ),
   );
 }
}

Example 2: app drawer in flutter

Widget createDrawerHeader() {
 return DrawerHeader(
     margin: EdgeInsets.zero,
     padding: EdgeInsets.zero,
     decoration: BoxDecoration(
         image: DecorationImage(
             fit: BoxFit.fill,
             image:  AssetImage('images/bg_header.jpeg'))),
     child: Stack(children: <Widget>[
       Positioned(
           bottom: 12.0,
           left: 16.0,
           child: Text("Welcome to Flutter",
               style: TextStyle(
                   color: Colors.white,
                   fontSize: 20.0,
                   fontWeight: FontWeight.w500))),
     ]));
}

Example 3: app drawer in flutter

Widget createDrawerBodyItem(
   {IconData icon, String text, GestureTapCallback onTap}) {
 return ListTile(
   title: Row(
     children: <Widget>[
       Icon(icon),
       Padding(
         padding: EdgeInsets.only(left: 8.0),
         child: Text(text),
       )
     ],
   ),
   onTap: onTap,
 );
}