Getter returns null in flutter

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Android

I have a getter/setter, that is being set in the top of the screen, when thr index is set, but when I try to get the value, it returns null.
Please elt me know what can I do to fix this.
Thanks.

What I have tried:

<pre>    getItemAndNavigate(index1, BuildContext context) {
      Navigator.push(context,
          MaterialPageRoute(builder: (context) => DetailScreen(index1, context)));
    }
     
    //second
     
    class DetailScreen extends StatelessWidget {
      int index1;
      BuildContext context;
      DetailScreen(this.index1, this.context);
     
      @override
      Widget build(BuildContext context) {
        // Use the Todo to create the UI.
        strings().setdepart = index1;

    print('depart: ' +
        strings().getdepart.toString());

    int get getdepart => _depart;
     
    set setdepart(int value) {
      _depart = value;
    }