private async void PaymentsRefresh()
        {
            payments = await DatabaseManager.DefaultManager.GetPaymentItemsAsync(tripItem);

            adapter          = new TripPaymentAdapter(this, payments);
            listView.Adapter = adapter;
        }
 private async void PaymentsDisplay()
 {
     if (!payments.Any())
     {
         payments = await DatabaseManager.DefaultManager.GetPaymentItemsAsync(tripItem);
     }
     adapter          = new TripPaymentAdapter(this, payments);
     listView.Adapter = adapter;
 }