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Samsung Galaxy2（Android 2.3.5）のGPS位置を調べています。 SG2はA-GPSをサポートしていますので、GPS、Wifiネットワーク、センサーを利用しました。それはうまくいくように見えますが、時々GPSは私の現在の場所から50km以上離れた場所に完全に異なる場所を与えます。また、私はちょうど電話を1つの場所に置いても触れなかったにもかかわらず、場所が頻繁に変わります。Samsung Galaxy2のGPS位置が正しくない
私はまだAndroidに新しいので、この問題の原因がわかりません。以下は、GPSの場所を扱うソースコードです。：
public class LocationMonitor extends Service implements LocationListener,Runnable {
.... other local variables here
Object locationUpdateNotifier= null;
public static GeoPoint ourLocation;
public void synchronize()
{
if(ourLocation == null)
{
ourLocation = getLastKnownLocation();
if(ourLocation == null) return;
}
//Load last time we synced
long lastSyncTime = some_value;
if(lastSyncTime < System.currentTimeMillis() - UPDATE_FREQ) //UPDATE_FREQ - default 30 minutes
{
handler.post(new Runnable() {
public void run() {
GpsPingTask pingTask = new GpsPingTask(context,String.valueOf(ourLocation.getLatitudeE6()/1E6),String.valueOf(ourLocation.getLongitudeE6()/1E6));
pingTask.execute((Void)null); //Send location to server
}
});
lastSyncTime = System.currentTimeMillis();
//Save new lastSync time
}
}
public void kill()
{
if(locationManager !=null)
locationManager.removeUpdates(this);
}
public void onLocationChanged(Location location) {
try
{
//Read latitude and longitude from location
//Create Geo point so we can get a english street name address
ourLocation = new GeoPoint((int)(location.getLatitude()*1E6),(int)(location.getLongitude()*1E6));
if(locationUpdateNotifier != null)
{
synchronized (locationUpdateNotifier) {
locationUpdateNotifier.notify();
}
}
if(!doneFirstUpdate)
{
doneFirstUpdate =true;
Log.i("LocationMointor", "LocationMonitor.onLocationChanged() done first update at 0 frequency, resetting to normal speed");
//Set it to update at the requested frequency
resetLocationUpdatesFreq();
}
startSynchronizeThread();
}
catch (Throwable e) {
Log.i("LocationMointor", "LocationMonitor.onLocationChanged(): " + e);
}
}
public void onProviderDisabled(
String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void setTemporaryLocationUpdateFreq(int pingFreqSecs) {
setTemporaryLocationUpdateFreq(pingFreqSecs, 10);
}
public void setTemporaryLocationUpdateFreq(int pingFreqSecs, int minimumDistanceMeters) {
if(!doneFirstUpdate)
doneFirstUpdate =true;
tempLocationUpdateFreq = pingFreqSecs;
tempLocationUpdateMeters = minimumDistanceMeters;
handler.post(new Runnable()
{
public void run() {
//Turn of location updates
if(locationManager !=null)
locationManager.removeUpdates(locationMonitor);
//Restart location updates with new frequency
locationManager.requestLocationUpdates(getGpsMode(), UPDATE_FREQ, tempLocationUpdateMeters,locationMonitor);
//locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, tempLocationUpdateFreq*1000, tempLocationUpdateMeters,locationMonitor);
}
});
}
private void startSynchronizeThread() {
if(!running)
new Thread(this).start();
}
public void resetLocationUpdatesFreq() {
locationUpdateNotifier = null;
handler.post(new Runnable()
{
public void run() {
//Turn of location updates
if(locationManager !=null) {
locationManager.removeUpdates(locationMonitor);
//Restart location updates with default location update frequency
//locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MINIMUM_TIME_BETWEEN_UPDATE, MINIMUM_DISTANCECHANGE_FOR_UPDATE,locationMonitor);
}
}
});
}
public void setLocationUpdateFreq(int pingFreqMins) {
Log.i("LocationMointor", "LocationMonitor.setLocationUpdateFreq().mode: " + getGpsMode() + "pingFreq:" + pingFreqMins);
//Save new frequency value
SharedPreferences pref = context.getSharedPreferences(PREF_PING_FREQ, Context.MODE_PRIVATE);
Editor prefEditor= pref.edit();
prefEditor.putInt(PREF_PING_FREQ, 10);
prefEditor.commit();
handler.post(new Runnable()
{
public void run() {
//Turn of location updates
if(locationManager !=null)
locationManager.removeUpdates(locationMonitor);
//Restart location updates with new piong frequency
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MINIMUM_TIME_BETWEEN_UPDATE, MINIMUM_DISTANCECHANGE_FOR_UPDATE,locationMonitor);
}
});
}
public void addUpdateNotify(Object notifyable)
{
this.locationUpdateNotifier = notifyable;
}
public GeoPoint getLastKnownLocation()
{
Criteria crit = new Criteria();
//Try get last known fine location
crit.setAccuracy(Criteria.ACCURACY_FINE);
String provider = locationManager.getBestProvider(crit, false);
Location loc = locationManager.getLastKnownLocation(provider);
//If we got no location, try coarse location
if(loc == null)
{
crit.setAccuracy(Criteria.ACCURACY_COARSE);
provider = locationManager.getBestProvider(crit, false);
loc = locationManager.getLastKnownLocation(provider);
//If nothing, return nothing
if(loc == null)
{
Log.i("LocationMointor", "LocationMonitor.getLastKnownLocation() got no location");
return null;
}
}
//Create geopoint and return it.
GeoPoint geoPoint = new GeoPoint((int)(loc.getLatitude()*1E6),(int)(loc.getLongitude()*1E6));
Log.i("LocationMointor", "LocationMonitor.getLastKnownLocation() got " +geoPoint);
return geoPoint;
}
@Override
public void run() {
running = true;
Object pauser = new Object();
do{
try
{
synchronize();
synchronized(pauser)
{
pauser.wait(UPDATE_FREQ);
}
}
catch(Throwable ex)
{
Log.e("LocationMointor", "LocationMonitor.run() " +ex);
}
}
while(running);
}
public void onCreate() {
super.onCreate();
this.context = this;
this.locationMonitor= this;
handler = new Handler();
//Get the location manager service
locationManager = (LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
//Start gps to get our location
this.locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, UPDATE_FREQ, this);
}
@Override
public void onDestroy() {
super.onDestroy();
kill();
}
@Override
public IBinder onBind(Intent arg0) {
return mBinder;
}
private final IBinder mBinder = new MyBinder();
public class MyBinder extends Binder {
public LocationMonitor getService() {
return LocationMonitor.this;
}
}
}
この問題を乗り越えるために手伝ってください。 ありがとうございます。
ポイントをありがとう。それは私がこの良いコミュニティを形成することを期待するものです。 – sunghun
最高の答えを覚えておいてください。 –