Default selector background in Clickable Views

This works for me:

android:background="?android:attr/selectableItemBackground"

It's list_selector_holo_dark or the equivalent holo light version; and these are the defaults in Honeycomb and above. list_selector_background is the non-holo version, used in Gingerbread and below.

EDIT: I believe (but can't confirm) that the platform agnostic selector is ?android:attr/listSelector