Pi Hex Calc

This application is designed to quickly and efficiently extract the nth hexadecimal digit of pi. This is done by using the BBP algorithm. This algorithm allows for the extraction of a hex digit of pi without calculation of any preceding digits. To prevent crashing of the app, the input is (for now) limited to integers between 0 and 9999 inclusive. As this is the first app I have made for android, it is not very impressive, but I plan to update it as I continue to learn more about android application development. A few features I am planning to include are:
-explanations of the algorithms
-larger input domain
-binary extraction
-sound
Please do not hesitate to inform me of bugs, glitches, or any desired features.