Adding icon to the menu item in Android

There is a good practice to add icons to the menu items.
I am going to show code snippet which add icon to the menu item:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
   menu.add(0, ADD_MENU_ITEM, 0, "Add").setIcon(android.R.drawable.ic_menu_add);
   return super.onCreateOptionsMenu(menu);
}

This code adds icon add to the menu item ADD_MENU_ITEM.

As you can see it is simple operation.