WillPopScope not working after using Drawer - flutter

Question

I am using drawer of my flutter app .I register first then redirect to Home Page .I have used drawer in my Home Page . I added some some menu on drawer then redirect to some new activity . I have added WillPopScope in Home page to tigged android back press .But problem is when i clicked back button from other activity but home activity WillPopScope calling.
This is home page
return WillPopScope(
onWillPop: (){
exit(0);
},
child: MaterialApp(
home: Scaffold(
drawer: StudentDrawer(
number: widget.number,
),
appBar: AppBar(
actions: <Widget>[
InkWell(
child: new Icon(
Icons.notifications,
color: Colors.white,
),
onTap: () {},
),
InkWell(
child: Icon(
Icons.more_vert,
color: Colors.white,
),
onTap: () {
_scaffoldKey.currentState.openDrawer();
},
),
],
title: Text(
"Home",
style: new TextStyle(
color: Colors.white,
letterSpacing: 1.0,
fontSize: 20,
fontStyle: FontStyle.normal),
),
),
body: SingleChildScrollView(
child: new Column(
children: <Widget>[
//top(),
/*SizedBox(
height: 7,
),*/
bottom()
],
),
),
),
),
);
This is drawer page
return Drawer(
child: Column(
children: <Widget>[ header(), Expanded(child: list(context))],
),
);
Widget list(BuildContext context) => new ListView(
scrollDirection: Axis.vertical,
shrinkWrap: true,
children: <Widget>[
ListTile(
onTap: (){
Navigator.pop(context);
Navigator.of(context).push(new MaterialPageRoute(builder: (context)=>Profile(number:widget.number)));
},
leading: new Icon(
Icons.perm_identity,
color: Colors.green,
),
title: Text(
"Profile",
style: TextStyle(color: Colors.green),
),
),
And This is my profile activity
return WillPopScope(
onWillPop:(){
print(" It's not calling .....");
Navigator.pop(context);
}
,
child: MaterialApp(
home: Scaffold(
appBar: AppBar(
leading: InkWell(
onTap: (){
Navigator.pop(context);
},
child:Icon(Icons.arrow_back,color: Colors.white,),
),
title: Text("Profile"),
),
Basically everything fine but problem is when i click back button from profile activity its calling onWillPop of Home activity ..