Building Computer Vision Projects with OpenCV 4 and C++

Finding and opening the camera

Next, we try to find a suitable back-facing camera by scanning the list of available cameras on the device. A characteristics flag is given to the camera if it's back-facing, as follows:

CameraManager manager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);try {    String camList[] = manager.getCameraIdList();    mCameraID = camList[0]; // save as a class member - mCameraID    for (String cameraID : camList) {        CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraID);        if(characteristics.get(CameraCharacteristics.LENS_FACING) == CameraCharacteristics.LENS_FACING_BACK) {            mCameraID = cameraID;            break;        }    }    Log.i(LOGTAG, "Opening camera: " + mCameraID); CameraCharacteristics characteristics ...