SecuXabber is a secure Jabber-client for Android that bases on Xabber and uses a strong, asymmetric enryption that works on top of the XMPP protocol. A key pair is generated on application start-up. Users can send their public key to other SecuXabber users via Bluetooth. This ensures the origin of the public key because people do a face-to-face check during key exchange. After the keys are imported by both users, all communication between them is done fully encrpyted using a strong 4096 bit end-to-end encryption.
Lacking (still, is not even a 1.0!!! jet) file transfer, photo transfer, blah blah blah, It's the only counterpoint... well and UI a bit old, the rest, just EXCELLENT... OTR access not too intrusive not too hidden... few flaws but in general a great job.