How to go back and refresh the previous page in Flutter?

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> You can trigger the API call when you navigate back to the first page like this pseudo-code

class PageOne extends StatefulWidget {
  @override
  _PageOneState createState() => new _PageOneState();
}

class _PageOneState extends State<PageOne> {
  _getRequests()async{

  }
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      body: new Center(
        child: new RaisedButton(onPressed: ()=>
        Navigator.of(context).push(new MaterialPageRoute(builder: (_)=>new PageTwo()),)
        .then((val)=>val?_getRequests():null),
      ),
    ));
  }
}

class PageTwo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    //somewhere
    Navigator.pop(context,true);
  }