refresh button that refresh different page flutter code example

Example 1: how i can reload page in flutter

Navigator.pushReplacement(
        context,
        MaterialPageRoute(
            builder: (BuildContext context) => super.widget));

Example 2: flutter reload a page when a button is clicker

Navigator.of(context).push(new MaterialPageRoute(builder: (context) => AddPage())).whenComplete(retrieveData);