SMACK ( http://www.igniterealtime.org/projects/smack/ ) with heavy patches for Android (SASL, DNS/SRV).

Changes 2010.05.07

Some PubSub classes may break your app, see  issue 11 . Quick fix.

Changes 2010.05.03

Parse with reflection should now work (thx koterpiller,  issue 10 )

Pubsub XML fixes from http://www.igniterealtime.org/issues/browse/SMACK-308

Changes 2010.04.02

Till Glocke got RosterVersioning to work. See his XEP-0237 aSmack documentation for details