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Smack connection shutdown in Android

Hello everyone!

I’m using Smack 4.1.7 in my Android app, and I can’t figure out, how to properly shutdown an XMPPTCPConnection when exiting (pressing back from my main activity). Doing conn.disconnect() closes Smack Packet Writer and Smack Packet Reader daemon threads, but Smack-Ping, Smack-Incoming Processor, Smack-Single Threaded Executor and Smack-Remove Callbacks daemon threads remain running. When I launch my app again and establish the connection, another pack of these daemon threads is created, and so on.

Trying to debug, I ended up with this test code in my IntentService:



XMPPTCPConnection conn = new XMPPTCPConnection(


.setHost(“gcm-xmpp.googleapis.com”) //$NON-NLS-1$



“project #”, //$NON-NLS-1$

“api key”) //$NON-NLS-1$


.setServiceName(“gcm.googleapis.com”) //$NON-NLS-1$






conn = null;


catch (Exception e)


// Something.


As far as I understand, conn is eligible for finalization, but finalize() is not invoked. For now, I use the solution, given in Not closing smack threads by disconnect (4.1.0-alpha1-SNAPSHOT), but I think there should be a better way.

So, what’s the proper way of closing a connection?

Any help would be greatly appreciated.

1 Like

Hey. Did you use the exact dirty fix given in Not closing smack threads by disconnect (4.1.0-alpha1-SNAPSHOT) ?
Did that work for you?