public async void getListOutlet(string serviceId, string comboId, Spinner spn, ViewGroup parent) { myAPI = RestService.For <IMyAPI>("https://goldenspa.azurewebsites.net"); List <AddressOfService> result; if (serviceId == null) { result = await myAPI.GetOutletFromCombo(comboId); } else { result = await myAPI.GetOutletFromService(serviceId); } //xử lí sự kiện chọn item //listOutlet.ItemSelected += new EventHandler<AdapterView.ItemSelectedEventArgs>(listOutlet_ItemSelected); List <KeyValuePair <string, string> > outlets_pair = new List <KeyValuePair <string, string> >(result.Count); var outlets = new List <string>(result.Count); for (int i = 0; i < result.Count; i++) { var item = new KeyValuePair <string, string>(result[i].MaChiNhanh, result[i].DiaChi); outlets_pair.Add(item); } foreach (var item in outlets_pair) { outlets.Add(item.Value); } var adapter = new ArrayAdapter <string>(parent.Context, Android.Resource.Layout.SimpleSpinnerItem, outlets); spn.Adapter = adapter; }