///Your list ,maybe a string list.

List

///generated AlphabetIndexGroup list, return your data string which used to get the fist letter tag.

List<AlphabetIndexGroup

///build your list view.

return AlphabetIndexListView( stickHeader: true, dataList: _groupContactList, //sideBarAlphabet: kDefaultAlphabets, groupBuilder: (String tag, int groupIndex) { return _buildHeaderItem(tag); }, childBuilder: (MemberModel data, int groupIndex, int childIndex) { return _buildListsItem(data); }, padding: const EdgeInsets.fromLTRB(0, 0, 0, 0), );