I ran into this problem because you can't use the ZipFile API on data files you have bundled with your application. I then realized that I didn't really want to bundle the data file with the application - I wanted the data files to be separately installed (and separately updatable). My data files are *not* mp3 files - but that's the general model I'm looking for.
I am new to Android, but my initial poking around indicates I'm not the only one who wants this. It doesn't make sense for each of us in this situation to set up our own servers and write our own download code for the data files ... what is the simplest way for us to achieve what we're looking for? Is this available with standard Android? Is this an opportunity to create a service and market it to Android developers?
Please help - time is of the essence.