android ndk UnsatisfiedLinkError when using a prebuilt shared library

Found the issue.

Apparently the ndk build system doesn't automatically load referenced shared libraries, even if they are declared in your Android.mk.

I had to call on System.loadLibrary(SightAPI) & System.loadLibrary("SightCore-jni") in order to solve this issue. I would have expected that the only library to load would have been the main library SightCore-jni.

Well..I guess the moral is If you want something done, do it yourself :)

+1 to Roy Samuel for his effort and correct instincts.

I hope this helps anyone.

Cheers

1. Have you made sure that the cpp function name, that you'd like to use over JNI, is corresponding to the package name of the Java wrapper class where System.loadLibrary("SightCore-jni"); is present?

   e.g. If you would like to use the C function, myFunction in the java layer, and suppose your JNI wrapper class is in the package com.my.package.sightcore, then your C code function name should be like this :

    JNIEXPORT  JNICALL Java_com_my_package_sightcore_myFunction(JNIEnv * env, jobject thiz, ...)
   

2. If you are running your app on your device, See if the API levels, and hence, the sdk release matches to your device's android version (API level).

Hope this helps. Let me know if you need more clarifications...