I just started reading the book an and tried to run the examples from chapter 2.4 “Use Touch Screen Pressure to Control Color Hues”. It looks like as if motionPressure is not giving changing values on all Android devices. On my cheap Lenovo A1 Ideapad (Android 2.3.4) the value is allways 0.375. Therefor no color changing ellipses, only red ones. The same script run on a Huwawei Honour (Android 4.0.3) works as expected.
I think a hint in the book would be helpful.
Best regards Armin