I started fiddling around with MonoDroid this week. Not that I don't appreciate Java, but I spend most of my time in either Visual Studio / C# or Delphi, and I'd rather pull my fingernails out than learn YET ANOTHER IDE and YET ANOTHER editor in order to use Eclipse.

I adapted this code to C# from Java, for situations where it's easier to populate my spinner programmatically in C# code rather than in the AXML. Perhaps some of you may find it helpful.

Create a generic Spinner In Your Activity's axml:

<Spinner
    android:id="@+id/spinner"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:prompt="@string/spinner_prompt"
/>

Build your array of string somewhere appropriate:

public static readonly string[] refresh_ratesS = {"10 seconds","20 seconds","30 seconds","60 seconds","5 minutes"};

I prefer to instantiate objects in the Activity's public class so that I only have to identify them once:

public class ActivityChooseRefreshRate :Activity {
    Spinner         jb_spinner;

In the Activity's OnCreate function assign your array to the spinner:

     //identify the spinner
jb_spinner      =   FindViewById<Spinner>(Resource.Id.spinner);
     //create the handler for when the user selects something
jb_spinner.ItemSelected += new EventHandler<ItemEventArgs> (jb_spinner_ItemSelected);
    //assign your array to an ArrayAdapter
ArrayAdapter<string>  spinnerArrayAdapter   =   new ArrayAdapter<string>(this,Android.Resource.Layout.SimpleSpinnerItem,refresh_ratesS);
      //Use the ArrayAdapter you've set up to populate your spinner
spinnerArrayAdapter.SetDropDownViewResource(Android.Resource.Layout.SimpleSpinnerItem);
jb_spinner.Adapter      =   spinnerArrayAdapter;
   //optionally pre-set jb_spinner to an index
jb_spinner.SetSelection(2);

Lastly, code the

c# xamarin.android android-spinner
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