Simple image canvas related Android application (repost)

I need an Android application that performs a simple function. I will provide 3 image.? 1. top image 2. hidden image 3. "eraser" image The function of the app goes like this, the top image covers the hidden image initially, and the eraser image is on top of the top image. User will be able to move the eraser image, and as the eraser moves, the top image is "erased" and the hidden image below will be revealed accordingly to the path of the eraser movement (just like wiping snow off the window will review the world outside). That is essentially how the application should work. A ppt is attached to provide further clarification