can't find the exact current location in android

I have use this below code for find the current location but i got that some devices(samsung 7' and 10'inch and nexus 10'inch) exact current locations,but unfoirtunately i can't find the locations in samsung s3. I don't have any idea ,what is issue.no find the locations. here is my code: ``` public class GPSTracker extends Service implements LocationListener { private final Context mContext; //flag for GPS Status boolean isGPSEnabled = false; //flag for network status boolean isNetworkEnabled = false; boolean canGetLocation = false; Location location; double latitude; double longitude; //The minimum distance to change updates in metters private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; //10 metters //The minimum time beetwen updates in milliseconds private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute //Declaring a Location Manager protected LocationManager locationManager; public GPSTracker(Context context) { this.mContext = context; getLocation(); } public Location getLocation() { try { locationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE); //getting GPS status isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER); //getting network status isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER); if (!isGPSEnabled && !isNetworkEnabled) { // no network provider is enabled } else { this.canGetLocation = true; //First get location from Network Provider if (isNetworkEnabled) { locationManager.requestLocationUpdates( LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this); Log.d("Network", "Network"); if (locationManager != null) { location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER); updateGPSCoordinates(); } } //if GPS Enabled get lat/long using GPS Services if (isGPSEnabled) { if (location == null) { locationManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this); Log.d("GPS Enabled", "GPS Enabled"); if (locationManager != null) { location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER); updateGPSCoordinates(); } } } } } catch (Exception e) { //e.printStackTrace(); Log.e("Error : Location", "Impossible to connect to LocationManager", e); } return location; } public void updateGPSCoordinates() { if (location != null) { latitude = location.getLatitude(); longitude = location.getLongitude(); } } /** * Stop using GPS listener * Calling this function will stop using GPS in your app */ public void stopUsingGPS() { if (locationManager != null) { locationManager.removeUpdates(GPSTracker.this); } } /** * Function to get latitude */ public double getLatitude() { if (location != null) { latitude = location.getLatitude(); } return latitude; } /** * Function to get longitude */ public double getLongitude() { if (location != null) { longitude = location.getLongitude(); } return longitude; } /** * Function to check GPS/wifi enabled */ public boolean canGetLocation() { return this.canGetLocation; } /** * Function to show settings alert dialog */ public void showSettingsAlert() { AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext); //Setting Dialog Title alertDialog.setTitle(R.string.GPSAlertDialogTitle); //Setting Dialog Message alertDialog.setMessage(R.string.GPSAlertDialogMessage); //On Pressing Setting button alertDialog.setPositiveButton(R.string.settings, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS); mContext.startActivity(intent); } }); //On pressing cancel button alertDialog.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }); alertDialog.show(); } /** * Get list of address by latitude and longitude * @return null or List<Address> */ public List<Address> getGeocoderAddress(Context context) { if (location != null) { Geocoder geocoder = new Geocoder(context, Locale.ENGLISH); try { List<Address> addresses = geocoder.getFromLocation(latitude, longitude, 1); return addresses; } catch (IOException e) { //e.printStackTrace(); Log.e("Error : Geocoder", "Impossible to connect to Geocoder", e); } } return null; } /** * Try to get AddressLine * @return null or addressLine */ public String getAddressLine(Context context) { List<Address> addresses = getGeocoderAddress(context); if (addresses != null && addresses.size() > 0) { Address address = addresses.get(0); String addressLine = address.getAddressLine(0); return addressLine; } else { return null; } } /** * Try to get Locality * @return null or locality */ public String getLocality(Context context) { List<Address> addresses = getGeocoderAddress(context); if (addresses != null && addresses.size() > 0) { Address address = addresses.get(0); String locality = address.getLocality(); return locality; } else { return null; } } /** * Try to get Postal Code * @return null or postalCode */ public String getPostalCode(Context context) { List<Address> addresses = getGeocoderAddress(context); if (addresses != null && addresses.size() > 0) { Address address = addresses.get(0); String postalCode = address.getPostalCode(); return postalCode; } else { return null; } } /** * Try to get CountryName * @return null or postalCode */ public String getCountryName(Context context) { List<Address> addresses = getGeocoderAddress(context); if (addresses != null && addresses.size() > 0) { Address address = addresses.get(0); String countryName = address.getCountryName(); return countryName; } else { return null; } } @Override public void onLocationChanged(Location location) { } @Override public void onProviderDisabled(String provider) { } @Override public void onProviderEnabled(String provider) { } @Override public void onStatusChanged(String provider, int status, Bundle extras) { } @Override public IBinder onBind(Intent intent) { return null; } ``` }