long expandablePosition = mExpandableItemManager.getExpandablePosition(flatPosition); int groupPosition = RecyclerViewExpandableItemManager .getPackedPositionGroup(expandablePosition);
private void trackHeader() { .getExpandablePosition(linearLayoutManager.findFirstVisibleItemPosition()); .getExpandablePosition(linearLayoutManager.findLastVisibleItemPosition()); .getExpandablePosition(linearLayoutManager.findLastVisibleItemPosition()); int lGroupPos = RecyclerViewExpandableItemManager .getPackedPositionGroup(lastExpandablePosition);