If provided, and not overridden by an action in the selected suggestion, this string will be placed in the action field of the Android.Content.Intent when the user clicks a suggestion. Optional attribute.

Must be a string value, using '\\;' to escape characters such as '\\n' or '\\uxxxx' for a unicode character.

This may also be a reference to a resource (in the form "@[package:]type:name") or theme attribute (in the form "?[package:][type:]name") containing a value of this type.

[Android Documentation]