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xamarinxamarin.formsxamarin.android

Invalid face detection type=0 error throws on certain devices - Xamarin.Android

I have xamarin.forms android project app with a custom camera view. I am using Camera.IFaceDetectionListener for detecting faces in the camera preview. It works fine on most of the devices. But in certain devices it throws exception which says invalid face detection type=0 after calling

Control.Preview.SetFaceDetectionListener(this);
Control.Preview.StartFaceDetection();

After some googling saw some SO post says some devices does not support face detection.

From this post Face detection not working , there is a way to check a device whether it support face detection or not by using Camera.getMaxNumDetectedFaces(). How exactly can I use this in xamarin? Or is there any other way to solve this issue? Because my app gets crashed when starting the Face detection. Any help is appreciated.

Solution

  • Determine if the device supports facial recognition.

    You could try to use this before you StartFaceDetection();

    CameraManager cManager = (CameraManager)GetSystemService(Context.CameraService);
string cId = (int)CameraFacing.Front + "";
CameraCharacteristics cameraCharacteristics = cManager.GetCameraCharacteristics(cId);
int maxCount = (int)cameraCharacteristics.Get(CameraCharacteristics.StatisticsInfoMaxFaceCount);

    If maxCount = 0 then we can be sure that our device does not support face detection