Sources of libraries

Hello,
We are currently developing an implementation of ODK, and we would need the sources of libraries included both in Services and Survey. Decompilers don't give us expected results.

We are talking about libs that can be found here:
http://cwe.cs.washington.edu:8082/artifactory/libs-demo/org.opendatakit/
more specifically,
demoAndroidcommon and demoAndroidlibrary.

Cheers,
Artur