Hi, Lapo.
Thank you so much for your help, I thing it make sense now.
It didn't go to SFSEvent.LOGIN_ERROR is because in Tris that event not yet been add to the EventListener.
I will try it soon after I get home.
I have download Tris example for android and of course the SmartFoxServer2X. Then I already replace SFS2X_API_Java.jar with the newer version from SmartFoxServer2X.
Everything work fine, but when I try to test about the default validation for duplicate name in a same Zone, it didn't work ...