This should make it possible to develop the core in Eclipse without the ADT.

Android UI elements can be destroyed and recreated at any time, and they
can only store serialisable state, so references to long-running tasks
have to take the form of serialisable handles. This is pretty ugly -
it's easy to create memory leaks if you don't clean up stale
handle/reference mappings - but it's less ugly than the common solution
of using static variables to hold references.