Fixed getCameraIds()

FixedGetCameraIds.java

private void getCameraIds() {
    cameraManager = (CameraManager) appContext.getSystemService(Context.CAMERA_SERVICE);
    CameraCharacteristics cameraCharacteristics;
    try {
        for (String cameraId : cameraManager.getCameraIdList()) {
            cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraId);
            if (isCameraFacingBack(cameraCharacteristics) && backCameraId == null) {
                backCameraId = cameraId;
            } else if (isCameraFacingFront(cameraCharacteristics) && frontCameraId == null) {
                frontCameraId = cameraId;
            }
        }
    } catch (CameraAccessException exception) {
        ...
    }
}