absolute strength of the magnetic field : Android

Similar to GPS Status application in android I want to get the "absolute strength of the magnetic field" and "theoretical strength". I am able to get the theoretical strength using Geom开发者_如何转开发agneticField getFieldStrength() method .

But I am not sure how to get the "absolute strength of the magnetic field" from sensors.

Please help.

Thanks.

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If you are looking for an absolute value of the magnetic field strength, you could simply calculate it as follows:

private final SensorEventListener mySensorListener = new SensorEventListner() {
   public void onSensorChange(SensorEvent event) {
       sensorRead = event.value;
       int sensorType = event.sensor.getType();

       if(sensorType = Sensor.TYPE_MAGNETIC_FIELD) {
          mag = sensorRead;
          magAbsVal = Math.sqrt(mag[0]*mag[0] + mag[1]*mag[1] + mag[2]*mag[2]);
       }
   }
}

This will give you the absolute uT value read from the magnetometer. If you are looking for a percentage value, you can use percentMag = largestMag/magAbsVal .

Hope it helps.