If you use Eclipse with ADT, the only thing you need to do is when you want to add the jar library to copy and paste it into the libs folder (this folder already exists in your Android project), and ADT will take care of adding it to the build path.
In fact, you have no choice if you add your jar file to the build path (as before), it will compile correctly, but when you launch your application, it will provide you with a NoClassDefFoundException.
(answer already mentioned in njzk2 short comment)
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