public static Android.Support.V7.App.AlertDialog CreateFullScreenIndeterminateProgressDialog(Context context)
{
var builder = new Android.Support.V7.App.AlertDialog.Builder(context);
builder.SetView(LayoutInflater.From(context).Inflate(Resource.Layout.loader, null));
//builder.SetCancelable(false);
builder.SetRecycleOnMeasureEnabled(true);
builder.SetInverseBackgroundForced(true);
var dialog = builder.Create();
dialog.Window.SetBackgroundDrawable(new ColorDrawable(Color.Transparent));
return dialog;
}