Some slightly bad news for you,
The android app appears to have been abandoned, some quick searches pull up a post from someone that called Lionel and got told that it was being worked on... back in Sep of last year.
Could have been pulled from the play store for a variety of reasons unfortunately. If you are looking to get the functionality of the camera app on mobile you'll need to grab an iOS device for it, or use a computer.
Funny enough the instruction manual seems to indicate it's a basic IP Wi-Fi Cam device that uses it's own wi-fi network (at least from the PC instructions it shows). Odds are it would be viewable on any app that can connect to an IP cam, but that goes beyond the spec of this thread.