Using Eclipse is not recommended, nor supported by Google.


We would recommend you to first migrate the project to Android Studio, which you can do as described at http://tools.android.com/tech-docs/new-build-system/migrating-from-eclipse-projects. Failing to do that, the other option for using the AAR in Eclipse is https://commonsware.com/blog/2014/07/03/consuming-aars-eclipse.html.