Is there a way to determine which contact changed?

I know I can register a ContentObserver for the URI but it only triggers when something changes, how am I supposed to know which contact changed and what changed for that contact? Is there a way to find out?

My app involves a desktop client and I would prefer not to send all of the contacts over to the desktop every time it connects. So I would like to keep track of what has changed since the last time the desktop connected.

Thanks in advance!

p.s. I'm using API Level 5+

android database contacts onchange
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