How to implement a ListView with a fixed group header, as done in stock contacts (2.3.5)?

Question

Android

Can you tell me how to implement a ListView with groups, as it is done in stock contacts (2.3.5)?
that is, when scrolling down, the group header always remains on top (letters A-ZA-Z).

Answer 1

" Pinned Header ListView as in the Contacts app " and its variation for ExpandableListView .