Creating Android app using java and openCv Query [closed]

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Hi guys, i am currently planning a project and could use some assistance regarding my setup. My app goal is to detect when a person is falling asleep based on facial detection, eyes closing and other facial features. The goal is to create an android application using java & xml in an android studio environment. Upon reading up on openCv I found that it is mainly C++ but then i found a java wrapper exists (Javacv). So my question to you guys is this, should i use javaCv or openCv for this ? The reason i am confused is that i see videos of people using openCv in an android environment so im guessing they are using java but why don't they use javaCv ? Unless they plan on converting C++ to java. I want to use java so if thats the case should i install javaCv instead of openCv? Hopefully you understand my confusion and can pass me some advice. Thanking you, have a good day.