When you background thread has new data to show from the network, it calls the listener(s) with the necessary parameters.
When (one of) your activity is coming to the foreground (onResume()), you call that method on your background thread to register itself as a listener.
This way, it will be called by your background thread when new data comes in.
When your activity is going to the background again (onPause), you un-register it so that callbacks to your activity are no longer occurring.
Be sure to have your background-thread call the listener(s) in the UI-thread (see Handler), since you can only update UI elements in the UI thread.
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