If you add a OnItemClickListener on your GridView you will not be able to listen to click events on the individual child components.
You should be able to get a reference to the child views of your parent AdapterView though. onItemClick callback is supplied instances of the parent AdapterView i.e. (GridView) and the view returned by getView() method of the adapter. I think, doing a findViewById() on the view object should give a handle on the individual child components.