Android : UnsatisfiedLinkError: Using project with native code as library project

I've built a project that contains native code for Android that compiles and runs, and now I would like to use that as a library-project for another project I am working on. I have no issues converting the project to a library project and referencing it in my new project, but when I try to run any code, I get a "java.lang.UnsatisfiedLinkError", saying it couldn't load the library. If I unzip the .apk, the .so contained in the library project is definitely there. Has anyone come across this issue? If it helps, the project I am using as a library-project is PJSUA2 from the PJSIP library. I am trying to build my own voip application.