I don’t think the problem is in the code you provided by more likely due to the implementation of the controlP5. I am guessing about this, and there is still a small chance it could be a problem in Android. The best way to address this problem is to generate a small code base that reproduces the problem. If you post this code here, somebody could try to reproduce it and confirm it.
To solve this problem, instead of using controlP5, you could use Android’s native widgets directly in your sketch. You can use this example to get you started.
Kf