How to change the color of a selected item in a listview?

I need to change the color of a selected item in a ListView when its clicked, so the user know what has clicked.

So far I have done this code for that:

listview.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
    for (int a = 0; a< parent.getChildCount();a++){
    parent.getChildAt(a).setBackgroundColor(Color.TRANSPARENT);
    view.refreshDrawableState();
     if(parent.getChildAt(a) == view){
         view.setBackgroundColor(getResources().getColor(R.color.soft_opaque));
         view.refreshDrawableState();
    }
}

What it does is to change the background color of the item selected and keep it like that until I click another item so it change only the current item selected background color

I also was wondering if there is an XML way to do it. What I've found so far is:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://ift.tt/nIICcg">
    <item android:state_focused="true" android:drawable="@color/black" /> <!-- focused -->
    <item android:state_focused="true" android:state_pressed="true" android:drawable="@color/black" /> <!-- focused and pressed-->
    <item android:state_pressed="true" android:drawable="@color/green" /> <!-- pressed -->
    <item android:drawable="@color/black" /> <!-- default -->
</selector> 

but haven't got what I the previous code does.