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Message from discussion making an android compass
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bob  
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 More options Sep 27 2012, 2:44 pm
From: bob <b...@coolfone.comze.com>
Date: Thu, 27 Sep 2012 11:44:41 -0700 (PDT)
Local: Thurs, Sep 27 2012 2:44 pm
Subject: Re: making an android compass
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Here is the *correct* (until proven otherwise) version of a compass for a
device lying flat on a table:

package com.magnet_test;

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;

public class Magnet_Listener implements SensorEventListener {

private float[] magneticFieldValues;

@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {

}

@Override
public void onSensorChanged(SensorEvent sensorEvent) {
if (sensorEvent.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD)
magneticFieldValues = sensorEvent.values;
 float x = magneticFieldValues[0];
float y = magneticFieldValues[1];
 float angle = (float) Math.atan2(y, x);
 float angle_in_degrees = (float) Math.toDegrees(angle) + 180;
 System.out.println("angle = " + angle_in_degrees);

}
}

*Inspired by code from Reto Meier.*
On Thursday, September 27, 2012 10:33:31 AM UTC-5, bob wrote:

> So, I'm trying to learn how to make an android compass.

> Naturally, I used a site called google and typed the following in:

> "making an android compass"

> I found myself at this URL:

> http://android-er.blogspot.com/2010/08/simple-compass-sensormanager-a...

> After looking thru it, I'm thinking it's incorrect.

> There is this suspiciously simple method:

> public void onSensorChanged(SensorEvent event) {
>  // TODO Auto-generated method stub
>  myCompassView.updateDirection((float)event.values[0]);
> }

> Basically, it seems like they are using the x component of the force
> vector as if it were an angle.  Can someone else look at this and let me
> know what you think?


 
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