> 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?

>  --
> You received this message because you are subscribed to the Google
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> To unsubscribe from this group, send email to
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> 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.

> 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?

> Why not post a comment on his blog and ask him about it?  That's what
> others have done... and he seems to respond to comments/questions
> consistently...

> Thanks,
> Justin Anderson
> MagouyaWare Developer
> http://sites.google.com/site/magouyaware

> On Thu, Sep 27, 2012 at 9:33 AM, bob <b...@coolfone.comze.com<javascript:>
> > 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?

>>  --
>> You received this message because you are subscribed to the Google
>> Groups "Android Developers" group.
>> To post to this group, send email to android-d...@googlegroups.com<javascript:>
>> To unsubscribe from this group, send email to
>> android-developers+unsubscribe@googlegroups.com <javascript:>
>> For more options, visit this group at
>> http://groups.google.com/group/android-developers?hl=en

> bob wrote:

>> So, I'm trying to learn how to make an android [sic] 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.

> You are mistaken.

>> There is this suspiciously simple method:

> What does "suspiciously simple" even mean?

> Why should simplicity engender suspicion?

> It's obviously a cover method for one that is less "suspicious".

>> 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?

> I think, no, wait, I am certain because I read the code to which you
> linked that it uses the x component
> to calculate the angle.

> It's trigonometry. I know, it must seem like magic.

> From the site to which you linked:

>  canvas.drawLine(cxCompass, cyCompass,
>    (float)(cxCompass + radiusCompass * Math.sin((double)(-direction) * 3.14/180)),
>    (float)(cyCompass - radiusCompass * Math.cos((double)(-direction) * 3.14/180)),
>    paint);

> I think I might've used
> http://developer.android.com/reference/java/lang/Math.html#PI
> and predefined

> private static final double CONVERT = Math.PI / 180.0;

> 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?

> Do you own the domain "magnet_test.com"?

> 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?

> On Thursday, September 27, 2012 11:27:46 AM UTC-7, Lew wrote:

>> bob wrote:

>>> So, I'm trying to learn how to make an android [sic] 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.

>> You are mistaken.

>>> There is this suspiciously simple method:

>> What does "suspiciously simple" even mean?

>> Why should simplicity engender suspicion?

>> It's obviously a cover method for one that is less "suspicious".

>>> 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?

>> I think, no, wait, I am certain because I read the code to which you
>> linked that it uses the x component
>> to calculate the angle.

>> It's trigonometry. I know, it must seem like magic.

>> From the site to which you linked:

>>  canvas.drawLine(cxCompass, cyCompass,
>>    (float)(cxCompass + radiusCompass * Math.sin((double)(-direction) * 3.14/180)),
>>    (float)(cyCompass - radiusCompass * Math.cos((double)(-direction) * 3.14/180)),
>>    paint);

>> I think I might've used
>> http://developer.android.com/reference/java/lang/Math.html#PI
>> and predefined

>> private static final double CONVERT = Math.PI / 180.0;

> I'm sorry, I made a mistake. I said, "uses the x component to calculate
> the angle" and should have
> said, "uses the angle to calculate the x component".

> See
> http://developer.android.com/guide/topics/sensors/sensors_position.html

> --
> Lew

> He was using:

> Sensor.TYPE_ORIENTATION

> I was using:

> Sensor.TYPE_MAGNETIC_FIELD

> I guess TYPE_ORIENTATION returns angles whereas TYPE_MAGNETIC_FIELD
> returns a vector.