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

expListView.setOnChildClickListener(new OnChildClickListener() {

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



                for (int i = 1; i < expListView.getChildCount(); i++) {
                    View child = (View) expListView.getChildAt(i);
                    child.setBackgroundColor(Color.BLACK);
                }


                if(childPosition==0){
                    initWebView("URL");

                }
                if(childPosition==1) {
                    initWebView("URL");

                }
                if(childPosition==2) {

                    initWebView("URL");

                }
                if(childPosition==3) {
                    initWebView("URL");

                }
                if(childPosition==4) {
                    initWebView("URL");

                }
                if(childPosition==5) {
                    initWebView("URL");
                }

                v.setBackgroundColor(Color.GRAY);


                expListView.setVisibility(View.GONE);
                webView.setVisibility(View.VISIBLE);
                return false;
            }
        });
 }