How to remove specific space between parent and child in an ExpandableListView

Question

Can you help me identify why there is a space between the group and the child? In my case I want spaces between all groups and the child should be right below the group with no

Answer 1

Set the child view programmatically like:

expandableListView.setDividerHeight(1);

expandableListView.setChildDivider(new ColorDrawable(Color.Black);

And group view From xml like :