*** Solved ***
I read this blog:
http://mysticlakesoftware.blogspot.com/
and try what he suggested:
changing
case Sensor.TYPE_MAGNETIC_FIELD:
mag = event.values;
to
case Sensor.TYPE_MAGNETIC_FIELD:
mag = event.values.clone();
for all sensor types. Now the getRotationMatrix works. Thank you. =)
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