title: Android face detection - Vision API or Camera API
body: <p>I need a simple way of detecting faces in my Camera app. All I care about is a callback saying that a face was detected in certain place or with coordinates where it was detected on the preview. I've noticed that there seem to be several face detection APIs - in Google Play services and in both legacy and camera2 APIs. Which one should I use for the simple requirement described above?</p>