[khanm]

Your best bet is to contact a patent lawyer. You actually have something here as it's called "prior art". Your product is prior art and they have stepped on you somehow. Let it be loss of revenue etc..

Basically your product predates theirs and you have a case. Also let the lawyers handle any communication as you may be stepping out of bounds. (let them handle it)

And be happy that someone is copying you, It's a sign of flattery. Plus they have made their Android users as a few marketers for you for free. Every time an Android users comes in contact with a iphone user who appreciates that app they will look for it in the iphone app store.

good luck.