Screen Space to Target Space Transformations

There is a how to guide on transforming between the two coordinate spaces already on the website here. I have been looking for the two methods projectScreenPointToPlane and linePlaneIntersection in the Dominoes project downloaded from the Advanced Android Samples. But it seems the code has been significantly revised. Where can I find those two methods to use in my own code? Or is there an alternative way to transform screen coordinates to the target space?