The Spinner will always have a selection. What you can do is make the Spinner display something like "Select"or "Select a option"...
To do this you can make your list options to be
actionList = {"Select", "Desactivate" }
and
public void onItemSelected(AdapterView> arg0, View arg1, int position, long id) {
actionList[0] = "Activate";
...
}
or you can do something more complicated like overrides the Spinner View
or put a button instead with nothing on it and when it's clicked you create your spinner.