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How to use Eigenfaces in Android Studio

Hi,

I've recently got OpenCV up and running in Android Studio. I'm trying to make a basic app that does some facial recognition but when I try to use createEigenFaceRecogizer or FisherFaceRecognizer I get a syntax error basically stating that Android Studio has no idea what that function is.

Looking online I've seen people mention that the Java wrapper excluded the facial recognition functions for some reason and that a work around is to create your own wrapper.

So I guess my first question is if this is true? Second, if that is true, then could anyone guide me on how to go about making a wrapper to make those functions work? I have no idea on how to go about this at all, so even a link to a tutorial about the very basics of making a proper wrapper would be greatly appreciated. Sorry if this is a too vague or uninteresting question, but I appreciate any help that you can offer.