I figured I'd give this a shot. Here's a few screenshots of what I've got so far:
It's all working pretty well at the moment. Clicking any of the buttons will bring up a popup list of the values to select from and you can drag the sliders to adjust the settings as well.
I'm thinking of setting it up so when you swipe the screen left/right it will go to the previous/next subnet and maybe adding a main page where you can select from a class/classless calculator.
If I have sometime later tonight I'll try to make a video of it running in the emulator.