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

I was having the same problem I fixed this by adding

v.setSelected(true);

here's a sample of my code :

expandableListDetailsLevel.setChoiceMode(ExpandableListView.CHOICE_MODE_SINGLE);
        expandableListDetailsLevel
                .setOnGroupExpandListener(new OnGroupExpandListener() {

                    public void onGroupExpand(int groupPosition) {

                        if(groupPosition!=1){
                            expandableIsThere = false;
                        }

                        for (int i = 0; i < len; i++) {
                            if (i != groupPosition) {
                                expandableListDetailsLevel.collapseGroup(i);
                            }
                        }
                    }
                });

        expandableListDetailsLevel
                .setOnChildClickListener(new OnChildClickListener() {

                    @Override
                    public boolean onChildClick(ExpandableListView parent,
                            View v, int groupPosition, int childPosition,
                            long id) {


                        v.setSelected(true);

                        }

my item xml

attribute android:drawSelectorOnTop="true" in the ExpandableListView element in the xml file (not the item child or group ) like this :