Android Moto X 4.2.2 Camera FaceDetectionListener onFaceDetection() never called -

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i have app using api level 14 camera.facedetectionlistener in conjunction camera.startpreview(), camera.startfacedetection(), , camera.setfacedetectionlistener() after checking camera.parameters.getmaxnumdetectedfaces().

on moto x running 4.2.2, getmaxnumdetectedfaces() returns 5, onfacedetection() never called.

testing on htc 1 running 4.4.2, works expected (and getmaxnumdetectedfaces() returns 16).

are there other checks perform make sure face detection available on device? assistance.


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