The droidText library (used for exporting to PDF format on Android and released under LGPL) has a detailed explanation of how to use their library and still comply with the LGPL:
http://code.google.com/p/droidtext/wiki/LGPLCompliance
I found it very helpful. Basically you use a utililty (dex2jar) to take the jar of the library OUT of the dex file- thus allowing and end user to update with a later version of the droidText library if they want to.