Android :: Listening To Services

In my ideal little dream world, I'd like to have a custom service running that handles network comms. Activities (e.g. UIs) then add listeners to it and it provides callbacks when anything interesting happens.

As it stands, I can't see how to do this in an appropriate way. OK, you can call bindService() and have a ServiceConnection implementation that monitors the service state. From there you can easily talk *to* the service whenever you desire, using serialisation over transactions, but I don't think that helps with communication initiated by the service.

The only way I know of doing what I want is by maintaining static collections of listeners on the service class, which doesn't strike me as good engineering.