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POCompass interferences when GPS is working on Android
 

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  1. POCompass interferences when GPS is working on Android
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    <p>I'm making an application for Android which uses a MapView thats rotates according to the compass data.</p> <p>The problem is that when GPS sensor is working (to locate my position and translate it into the MapView), compass data gets so much interferences. And if I turn it off, compass works well again.</p> <p>I'm using a low-pass filter, but interferences are bigger than 90º, so it doesn't work.</p> <p>Any solution?</p> <p>Here is my GPS class code:</p> <pre><code>public class LocationController implements LocationListener, GpsStatus.Listener { private static final String TAG = "LOOKAROUND_LOCATION"; private LocationManager mService; private LocationProvider mProvider; private GpsStatus mStatus; private ArrayList&lt;LocationActivity&gt; mLocationActivities = new ArrayList&lt;LocationActivity&gt;(); boolean mStarted; private Location mLastLocation; private static LocationController sInstance; public static LocationController getInstance(Context context) { if(sInstance == null){ sInstance = new LocationController(context); } return sInstance; } public void addLocationActivity(LocationActivity activity) { mLocationActivities.add(activity); } public LocationController(Context context){ mService = (LocationManager)context.getSystemService(Context.LOCATION_SERVICE); mProvider = mService.getProvider(LocationManager.GPS_PROVIDER); if (mProvider == null) { Log.e(TAG, "Unable to get GPS_PROVIDER"); } mService.addGpsStatusListener(this); } public void gpsStart() { if (!mStarted) { mService.requestLocationUpdates(mProvider.getName(), 1000, 0.0f, this); mStarted = true; } for (LocationActivity activity : mLocationActivities) { activity.gpsStart(); } } public void gpsStop() { if (mStarted) { mService.removeUpdates(this); mStarted = false; } for (LocationActivity activity : mLocationActivities) { activity.gpsStop(); } } public void onLocationChanged(Location location) { mLastLocation = location; for (LocationActivity activity : mLocationActivities) { activity.onLocationChanged(location); } } public void onProviderDisabled(String provider) { for (LocationActivity activity : mLocationActivities) { activity.onProviderDisabled(provider); } } public void onProviderEnabled(String provider) { for (LocationActivity activity : mLocationActivities) { activity.onProviderEnabled(provider); } } public void onStatusChanged(String provider, int status, Bundle extras) { for (LocationActivity activity : mLocationActivities) { activity.onStatusChanged(provider, status, extras); } } public void onGpsStatusChanged(int event) { mStatus = mService.getGpsStatus(mStatus); for (LocationActivity activity : mLocationActivities) { activity.onGpsStatusChanged(event, mStatus); } } public void shutdownGps(){ mService.removeGpsStatusListener(this); mService.removeUpdates(this); } public float getAccuracy(){ float acc = -1; if(mLastLocation != null){ acc = mLastLocation.getAccuracy(); } return acc; } public float getDeclination(){ float declination = 0; if (mLastLocation != null) { GeomagneticField geoField = new GeomagneticField( (float) mLastLocation.getLatitude(), (float) mLastLocation.getLongitude(), (float) mLastLocation.getAltitude(), mLastLocation.getTime()); declination = geoField.getDeclination(); } return declination; } </code></pre> <p>}</p> <p>And this is the Orientation class code:</p> <pre><code>public class OrientationController implements SensorEventListener{ private static final String TAG = "LOOKAROUND_ORIENTATION"; static final float ALPHA = 0.2f; private SensorManager mSensorManager; private ArrayList&lt;OrientationActivity&gt; mOrientationActivities = new ArrayList&lt;OrientationActivity&gt;(); Sensor accelerometer; Sensor magnetometer; float[] mGravity = null; float[] mGeomagnetic = null; float azimut; private static OrientationController sInstance; public static OrientationController getInstance(Context ctx) { if (sInstance == null) sInstance = new OrientationController(ctx); return sInstance; } public void addOrientationActivity(OrientationActivity activity) { mOrientationActivities.add(activity); } private OrientationController(Context ctx) { mSensorManager = (SensorManager)ctx.getSystemService(Context.SENSOR_SERVICE); accelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); magnetometer = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD); mSensorManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL); mSensorManager.registerListener(this, magnetometer, SensorManager.SENSOR_DELAY_NORMAL); } public void onAccuracyChanged(Sensor arg0, int arg1) { // TODO Auto-generated method stub } private float[] lowPass( float[] input, float[] output ) { if ( output == null ) return input; for ( int i=0; i&lt;input.length; i++ ) { output[i] = output[i] + ALPHA * (input[i] - output[i]); } return output; } public void onSensorChanged(SensorEvent event) { if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) mGravity = lowPass(event.values, mGravity); if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) mGeomagnetic = lowPass(event.values, mGeomagnetic); if (mGravity != null &amp;&amp; mGeomagnetic != null) { float R[] = new float[9]; float I[] = new float[9]; boolean success = SensorManager.getRotationMatrix(R, I, mGravity, mGeomagnetic); if (success) { float orientation[] = new float[3]; SensorManager.getOrientation(R, orientation); azimut = orientation[0]; float degAzimut = (float)Math.toDegrees(azimut); for(OrientationActivity orientationActivity : mOrientationActivities){ orientationActivity.onOrientationChanged(degAzimut); } } } } </code></pre> <p>}</p>
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    1. COI've never saw any interference from GPS in compass. Better to post your code related to GPS, as the problem should be something else.
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      1. USLuis
 

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