How to programmatically add a submenu item to the new material design android support library

Question

I am trying to add new menu items to a submenu in the new Material Design drawer panel.

Answer 1

Use this method to add menu and submenu

private void addItemsRunTime(NavigationView navigationView) {

        //adding items run time
        final Menu menu = navigationView.getMenu();
        for (int i = 1; i <= 3; i++) {
            menu.add("Runtime item "+ i);
        }

        // adding a section and items into it
        final SubMenu subMenu = menu.addSubMenu("SubMenu Title");
        for (int i = 1; i <= 2; i++) {
            subMenu.add("SubMenu Item " + i);
        }

        // refreshing navigation drawer adapter
        for (int i = 0, count = mNavigationView.getChildCount(); i < count; i++) {
            final View child = mNavigationView.getChildAt(i);
            if (child != null && child instanceof ListView) {
                final ListView menuView = (ListView) child;
                final HeaderViewListAdapter adapter = (HeaderViewListAdapter) menuView.getAdapter();
                final BaseAdapter wrapped = (BaseAdapter) adapter.getWrappedAdapter();
                wrapped.notifyDataSetChanged();
            }
        }
    }

and call this method where you setup Drawer Content.