MC3390R Camera Scanner

Take photo by scanner [camera] with on MC3390R

How to take a picture with a scanner on a mobile device ?

This device doesn't have a camera (No front, No back) , I would like to take a photo with the scanner. (In the regreted Windows os that was possible... lol) I think in Android it's possible but how ?

I tried by this way :

CameraManager manager = (CameraManager) view.getContext().getSystemService(Context.CAMERA_SERVICE);
for (String cameraId : manager.getCameraIdList()) {

}

--> But the list (manager.getCameraIdList()) is allways empty.