Android OpenCV SDK for coding only in C++

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Dear all, I want to work in Java native interface, and I intend to use C++ to use the camera and detect an object with an NN in OpenCV. This is my project to use nonfree libraries in JNI. I am very new in the area, and I read the concept of JNI in Oracle, and memory management and concepts like pinning, etc.. I have OpenCV Android SDK downloaded, and in there are one Java and Native folder. I was wondering if the native folder includes all the OpenCV libraries, independent of java folder. Could you please explain the contents of android sdk.