[android-developers] detection twist using orientation sensor

At the moment I can detect rotation along the x-axis and also y-axis.
However imagine the user holding their phone looking at the screen, I
want to detect and measure how much the user has rotated their phone
to the left or right such that the screen is always vertical. I
thought this would correspond to the z-axis rotation but from my
logging it seems like there is also dramatic rotation on the other
axis. So my question is how can I detect the user rotating their
phone in a twisting motion such that the screen is always facing the
user? I want to be able to detect this motion and also measure the
amount of twist the user has applied.

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