Finished with my calculator today and tested it on my galaxy tab. Seemed to work fine. Actually, found some bugs. Hard to believe there were bugs in a simple calculator but there were. In any case, all fixed now. Now for creating the endless stream of icons that you need to publish to iTunes and Google play. I don't understand why I can't just give them one big image and have them pragmatically create all the other sizes they need. But oh well, another day making icons wont kill me.