//UI
public static List <View> GetDescendantViews(this ViewGroup group, List <View> views = null)
{
if (views == null)
{
views = new List <View>();
}
List <View> newViews = group.GetAllViews();
views.AddRange(newViews);
foreach (View groupView in newViews.Where(x => x is ViewGroup))
{
GetDescendantViews(((ViewGroup)groupView), views);
}
return(views);
}