refresh.dart

import 'dart:math';

final random = Random();
final refreshKey = GlobalKey<RefreshIndicatorState>();
var lista = [];

Future<Null> refreshList() async {
    refreshKey.currentState?.show(atTop: false);
    await Future.delayed(Duration(seconds: 1));
    setState(() {
      lista = List.generate(random.nextInt(10), (i) => "Item $i");
    });
    return null;
  }