In normal Java you would use Radio Buttons instead of check boxes. You then add the two radio buttons to a radio button group (I think that's what it's called - it's a while since I did any Swing) and then the unchecking of one box when you check the other would be handled automatically. Can the Android GUI classes do something similar ?
Don't mess with me you fool! I'm cooking with gas! Here, read this tiny ad:
RavenDB is an Open Source NoSQL Database that’s fully transactional (ACID) across your database