Last logout time?

Smack Smack Dev
1

I hope to get the last logout time of my account :

XMPPConnection con = new XMPPConnection(“domain”);

con.connect();
con.login(“usr”, “pwd”);
LastActivity activity = LastActivityManager.getLastActivity(con, “usr@domain/Smack”);

String idleTime = activity.getIdleTime();

But the value of idleTime is -1. Why?

How can I get the last logout time of my account?

Thanks!