If provided and true, URLs entered in the search dialog while searching within this activity would be detected and treated as URLs (show a 'go' button in the keyboard and invoke the browser directly when user launches the URL instead of passing the URL to the activity). If set to false any URLs entered are treated as normal query text. The default value is false. Optional attribute..

Must be a boolean value, either "true" or "false".

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]