arsalan13:
You guys left some hilarious replies, interesting coming back to this post after a while .
Well yeah, a few ideas were a little over the top...
CrossRoads:
Or, for hands-free operation: Press down and gently turn the cup clockwise
Hands free, yeah. 
But seriously....
arsalan13:
My end goal is to have a protein shake mixer that I can operate with a touch screen, just a pet project.
I figure if I can make one that runs off my computer, it shouldn't be too hard to do with an Android device?
This is a health related device, right? You're waaay overthinking things. Get a kids sippy cup. Fill it with ingedients. Put it in a fanny pack. Do four laps around the block. Done and done, no code, no electricity, save a tree.