Menu is defined like this:
<item
            android:id="@+id/nav_slideshow"
            android:icon="@drawable/ic_menu_slideshow"
            android:title="@string/menu_slideshow"
            app:actionViewClass="android.widget.CheckBox"/>
I need to know android:icon value as provided in xml. There is a method getIcon() but it returns Drawabe object. How to get resource id as int?
[edit] Not a duplicate, solution proposed as possible answer is unrelated.