public class MainActivity : Activity
    {
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            // Set our view from the "main" layout resource
            SetContentView (Resource.Layout.Main);

            Spinner spinner = FindViewById<Spinner>(Resource.Id.spinnerMesice);

            spinner.ItemSelected += new EventHandler<AdapterView.ItemSelectedEventArgs>(spinner_ItemSelected);
            var adapter = ArrayAdapter.CreateFromResource(
                    this, Resource.Array.mesice_array, Android.Resource.Layout.SimpleSpinnerItem);

            adapter.SetDropDownViewResource(Android.Resource.Layout.SimpleSpinnerDropDownItem);
            spinner.Adapter = adapter;
        }

        private void spinner_ItemSelected(object sender, AdapterView.ItemSelectedEventArgs e)
        {
            Spinner spinner = (Spinner)sender;

            string toast = string.Format("Měsíc je {0}", spinner.GetItemAtPosition(e.Position));
            Toast.MakeText(this, toast, ToastLength.Long).Show();
        }
    }