Source code
package android.support.design.internal;
import android.content.Context;
import android.support.v7.internal.view.menu.MenuBuilder;
import android.support.v7.internal.view.menu.MenuItemImpl;
import android.support.v7.internal.view.menu.SubMenuBuilder;
import android.view.SubMenu;
public class NavigationMenu extends MenuBuilder {
public NavigationMenu(Context context) {
super(context);
}
public SubMenu addSubMenu(int group, int id, int categoryOrder, CharSequence title) {
MenuItemImpl item = (MenuItemImpl) addInternal(group, id, categoryOrder, title);
SubMenuBuilder subMenu = new NavigationSubMenu(getContext(), this, item);
item.setSubMenu(subMenu);
return subMenu;
}
}