Android Question External jar Libraries

I have two situations and would appreciate feedback as to whether what I have described below is achievable. thanks

a)
I have been provided a set of jar files from a hardware manufacturer to enable integration of the hardware into an Android app. I have successfully written a simple Android app within Eclipse calling the jar file (to use the hardware), and that all work fine.

I would now like to create the main app using B4PPC and to be able to call the functions in the manufacturers original jar file.

Can this be done simply and is there a demo somewhere to show me how.


b)
I have a VB6 main app, plus a few DLL's I wrote also in VB6.

I would like to move all these to B4PPC and can proceed to do that however I have a few questions regards the DLL's as far as External Libraries are concerned. Namely can I create Libraries using B4PPC in a similar manner to the VB environment.
These DLL's have parameters passed to them, they performs tasks (lets say file and data handling and comms to a server) and then pass data back to the Main app.

Questions ;

i)
using B4PPC as the Main app, and B4PPC as the Library (replacing the DLL), can I build the same environment.

ii)
using B4PPC as the Main app, and writing a similar Library to my VB DLL but using Java via Android Eclipse, can the B4PPC app call and use this jar file

iii)
Using Android Eclipse to create an Android app, and then writing a similar Library to my VB DLL using B4PPC, can the Android app call and use the Library written in B4PPC

Thanks in advance
Harry