I have heard many reports that the rockbox android app does not run when using the newer ARt runtime engine instead of the older Dalvik. Obviously since the android port relies heavily on the Jni, It would be logicial to assume that the stricter Jni settings is what is causing it to crash. I found this page https://developer.android.com/guide/practices/verifying-apps-art.html
which discusses many things that can cause Jni code to malfunction, and plan on working on fixing this issue.
If anyone has a inkling of why the crash is occuring, please post it in this forum as it will help me look in the right direction