package com.devsmart.android;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.os.RemoteException;
public class LocationService extends Service {
private Location mBestLocation;
ILocationService.Stub mService = new ILocationService.Stub() {
@Override
public Location getBestLocation() throws RemoteException {
return mBestLocation;
}
};
private LocationManager mLocationManager;
@Override
public IBinder onBind(Intent arg0) {
return mService;
}
@Override
public void onCreate() {
super.onCreate();
mLocationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
mBestLocation = null; //mLocationManager.getLastKnownLocation(LocationManager.PASSIVE_PROVIDER);
if(mBestLocation == null) {
mBestLocation = mLocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
}
if(mBestLocation == null) {
mBestLocation = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
}
mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, mLocationListener);
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, mLocationListener);
//mLocationManager.requestLocationUpdates(LocationManager.PASSIVE_PROVIDER, 0, 0, mLocationListener);
}
private LocationListener mLocationListener = new LocationListener() {
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onLocationChanged(Location location) {
if(isBetterLocation(location, mBestLocation)){
mBestLocation = location;
}
}
};
@Override
public void onDestroy() {
super.onDestroy();
mLocationManager.removeUpdates(mLocationListener);
}
private static final int TWO_MINUTES = 1000 * 60 * 2;
/** Determines whether one Location reading is better than the current Location fix
* @param location The new Location that you want to evaluate
* @param currentBestLocation The current Location fix, to which you want to compare the new one
*/
protected boolean isBetterLocation(Location location, Location currentBestLocation) {
if (currentBestLocation == null) {
// A new location is always better than no location
return true;
}
// Check whether the new location fix is newer or older
long timeDelta = location.getTime() - currentBestLocation.getTime();
boolean isSignificantlyNewer = timeDelta > TWO_MINUTES;
boolean isSignificantlyOlder = timeDelta < -TWO_MINUTES;
boolean isNewer = timeDelta > 0;
// If it's been more than two minutes since the current location, use the new location
// because the user has likely moved
if (isSignificantlyNewer) {
return true;
// If the new location is more than two minutes older, it must be worse
} else if (isSignificantlyOlder) {
return false;
}
// Check whether the new location fix is more or less accurate
int accuracyDelta = (int) (location.getAccuracy() - currentBestLocation.getAccuracy());
boolean isLessAccurate = accuracyDelta > 0;
boolean isMoreAccurate = accuracyDelta < 0;
boolean isSignificantlyLessAccurate = accuracyDelta > 200;
// Check if the old and new location are from the same provider
boolean isFromSameProvider = isSameProvider(location.getProvider(),
currentBestLocation.getProvider());
// Determine location quality using a combination of timeliness and accuracy
if (isMoreAccurate) {
return true;
} else if (isNewer && !isLessAccurate) {
return true;
} else if (isNewer && !isSignificantlyLessAccurate && isFromSameProvider) {
return true;
}
return false;
}
/** Checks whether two providers are the same */
private boolean isSameProvider(String provider1, String provider2) {
if (provider1 == null) {
return provider2 == null;
}
return provider1.equals(provider2);
}
}