createFlatList(List<String> list) Flatten mixed list containing contacts and groups to a new list
containing only contacts.
Parameters: list - mixed list list containing only contacts.
Flatten mixed list containing contacts and groups to a new list
containing only contacts.
Parameters: list - mixed list list containing only contacts. Never null
Create list containing only strings from a HeaderItemList containing
HeaderItem objects.
Parameters: list - HeaderItemList containing HeaderItem objects list containing only strings