android: changing option menu items programmatically

Question

Is it possible to change the option menu items programmatically? Can anyone provide me with an example please?

Also, I want to disable certain items, so that they do

Answer 1

To disable certain items:

MenuItem item = menu.findItem(R.id.ID_ASSING_TO_THE_ITEM_IN_MENU_XML);
item.setEnabled(false);