Proguard in Android Library

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http://stackoverflow.com – I am having an error with the Proguard file in Android. The point is, I know how to use it in an Android Project, but now, I need to use it for an Android Library Project, and the .jar extracted (there is no resources on the library), to obfuscate the code, because I would like to distribute my library for everyone to use it, but with the code obfuscated. My Android library project is a normal one, I just take the .jar with is contained in the "bin" folder from the Library Project, and I am trying to use the Proguard to obfuscate it this way: java -jar proguard.jar @proguard-project -verbos (HowTos)