Create Android JarFile object that looks for file inside .apk?

Question

Hi,

I was curious if there was an effective way to create a JarFile object (see: http://developer.android.com/reference/java/util/jar/JarFile.html ) that references a jar file imported into the running APK?

I'm trying to make a self-updating JAR file that can be imported into projects, so I can release patches and updates for the library if necessary. I'm prepared to keep the logistics of the actual JAR file working properly with backwards compatibility and stuff, I just can't, for the life of me, after tons of searching, figure out how to implement this properly.

Thanks