[android-developers] Warning users of strong magnetic field

Does anybody know how to warn users of string magnetic field? I'm creating a compass application. But when there are magnetic items around, the north direction is going wrong.

Using SensorEventListener#onAccuracyChanged doesn't help.

Is there any tutorial telling me how to handle this problem?

FYI, I followed this tutorial to create this compass app: http://stackoverflow.com/questions/4819626/android-phone-orientation-overview-including-compass

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