Highlight for selected item in expandable list

Question

I have a layout where I have an expandable list in a fragment on the left and a details fragment on the right. This all works fine.

Now I would like to indicate what

Answer 1

This simple solution has helped me when I was faced with the same question as the author

I have a layout where I have an expandable list in a fragment on the left and a details fragment on the right. This all works fine. Now I would like to indicate what item on the left is having it's details shown on the right and here I'm having a problem.

To indicate what item in expandable list is selected go to ExpandableListView properties (in layout) and chose color for listSelector.