ApiLevelAndroid.cs

public void SetProgress(int i) 
{
    isSpinning = false;
	var newProgress = (int)((float)i / (float)100 * (float)360);

	if (version >= Android.OS.BuildVersionCodes.Honeycomb)
	{
		Android.Animation.ValueAnimator va = 
			(Android.Animation.ValueAnimator)Android.Animation.ValueAnimator.OfInt (progress, newProgress).SetDuration (250);

		va.Update += (sender, e) => {
			var interimValue = (int)e.Animation.AnimatedValue;

			progress = interimValue;

			//Text = Math.Round(((float)interimValue/(float)360)*(float)100) + "%";

			Invalidate ();
		};

		va.Start ();
	}
	else
		progress = newProgress;

	spinHandler.SendEmptyMessage(0);
}