If I click on the “overflow” action bar icon, I only see my menu items as text, but the icon is not displayed!
Is this the default behaviour? How can I force showing the icon?
If you look at http://developer.android.com/design/patterns/actionbar.html > “Sharing data” image, it at least seems to be possible to have icons there. But how?
Yes.
AFAIK, you can’t. The icons are used on action bar items (toolbar buttons), and on classic options menus (e.g., Android 2.x).
That is not the overflow. That is a
ShareActionProvider. You can tell this by reading the page you linked to: