I get it. I followed these directions , but continued to receive various error messages, including ClassNotFound exceptions.
It turns out that the way ADT 17 processes .jar files violates this Unity integration method in Eclipse. After hours of searching, here I came up with a fix:
Instead of adding class.jar to your build path, you should just copy the classes.jar file to the /lib directory of your project, and everything should work as expected.
starkej2
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