public static void ShowProgress()
{
CrossCurrentActivity.Current.Activity.RunOnUiThread(() =>
{
var builder = new Android.Support.V7.App.AlertDialog.Builder(CrossCurrentActivity.Current.Activity);
var dialogView = CrossCurrentActivity.Current.Activity.LayoutInflater.Inflate(Resource.Layout.progressDialog, null);
builder.SetView(dialogView);
progressDialog = builder.Show();
progressDialog.SetCancelable(false);
progressDialog.Window.SetLayout(Utils.ConvertDpToPixels(200), LayoutParams.WrapContent);
var progressText = dialogView.FindViewById <TextView>(Resource.Id.progressText);
progressText.Text = "cargando";
});
}