[Flutter] how to hide Bottom Navigation Bar on new screen in flutter?

Just like here when I click on the timer, the Bottom navigation bar was disappeared. I want to implement the same thing on flutter. Whenever I click on Bottom Navigation Bar Item, for the new screen the Bottom Navigation Bar should not appear.



Here is my code. My Bottom Navigation Bar has four items and I want to hide the bottom navigation bar when I route to a new screen.

class MyFeedScreen extends StatefulWidget {
@override
_MyFeedScreenState createState() => _MyFeedScreenState();
}

class _MyFeedScreenState extends State<MyFeedScreen> {
int _bottomNavIndex = 0;

Widget pageCaller(int index) {
switch (index) {
case 0:
{
return Category();
}
case 1:
{
return Feed();
}
case 3:
{
return Settings();
}
}
}

@override
Widget build(BuildContext context) {
SizeConfig().init(context);
return Scaffold(
body: pageCaller(_bottomNavIndex),
bottomNavigationBar: BottomNavigationBar(
backgroundColor: klogoBlue,
selectedItemColor: Color(0xfff5f5f5),
unselectedItemColor: Color(0xfff5f5f5),
selectedFontSize: 12.0,
type: BottomNavigationBarType.fixed,
currentIndex: _bottomNavIndex,
onTap: (index) {
setState(() {
_bottomNavIndex = index;
});
},
items: [
BottomNavigationBarItem(
icon: Padding(
padding:
EdgeInsets.only(top: SizeConfig.blockSizeVertical * 0.60),
child: Icon(Icons.category),
),
title: Padding(
padding: EdgeInsets.symmetric(
vertical: SizeConfig.blockSizeVertical * 0.60),
child: Text('Category'),
),
),
BottomNavigationBarItem(
icon: Padding(
padding:
EdgeInsets.only(top: SizeConfig.blockSizeVertical * 0.60),
child: Icon(FontAwesomeIcons.newspaper),
),
title: Padding(
padding: EdgeInsets.symmetric(
vertical: SizeConfig.blockSizeVertical * 0.60),
child: Text('My Feed'),
),
),
BottomNavigationBarItem(
icon: Padding(
padding:
EdgeInsets.only(top: SizeConfig.blockSizeVertical * 0.60),
child: Icon(Icons.refresh),
),
title: Padding(
padding: EdgeInsets.symmetric(
vertical: SizeConfig.blockSizeVertical * 0.60),
child: Text('Refresh'),
),
),
BottomNavigationBarItem(
icon: Padding(
padding:
EdgeInsets.only(top: SizeConfig.blockSizeVertical * 0.60),
child: Icon(Icons.settings),
),
title: Padding(
padding: EdgeInsets.symmetric(
vertical: SizeConfig.blockSizeVertical * 0.60),
child: Text('Settings'),
),
),
],
),
);
}
}

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