Many phones get this wrong (and HTML5 implementations too).  Android's 
documentation on getOrientation from a rotation matrix is also incomplete 
and ambiuguous, and there own implementation doesn't seem to follow what 
they document.  I believe this is a poor attempt to cover there gaffe of 
using left-handed conventions in their deprecated ORIENTATION sensor.  Here 
is a good blog on the topic that may be helpful:  
http://www.sensorplatforms.com/understanding-orientation-conventions-mobile-platforms/

On Sunday, October 4, 2009 5:57:30 AM UTC-7, DD wrote:
>
> Hi, 
>
> It seems that for onSensorChanged(), the orientation readings 
> (yaw,pitch,roll) are not detected directly, but computed from the 
> acceleration readings. Does anybody know how they do this calculation? 
> is it by rotationmatrix..? May I know exactly the calculation process? 
>
> Thanks!

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