Android Retrofit xml with Callback

Question

I've been following this article on how to get retrofit to work with xml... which works.

How to use Retrofit and SimpleXML together in downloading and parsing an XML file from a site?

But It needs to work with a callback. And I just cant get it work.

Has any one else done one?

public class LocksXmlDisplay {

@Root(name = "breakfast_menu")
public class BreakFastMenu
{
    @ElementList(inline = true)
    List<Food> foodList;
}

@Root(name="food")
public class Food
{
    @Element(name = "name")
    String name;

    @Element(name = "price")
    String price;

    @Element(name = "description")
    String description;

    @Element(name = "calories")
    String calories;
}

public BreakFastMenu breakFastMenu;

}

public interface GetKnocksInter {
@GET("/simple.xml")
//LocksXmlDisplay getxml();
void fetchxml(Callback<List<LocksXmlDisplay.Food>> mycallback);

}

            getKnocksInter.fetchxml(new Callback<List<LocksXmlDisplay.Food>>() {
            @Override
            public void success(List<LocksXmlDisplay.Food> foods, Response response) {

            }

            @Override
            public void failure(RetrofitError error) {

            }
        });