Android Open Source - swap Location Service

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License

The source code is released under:

This is free and unencumbered software released into the public domain. Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a co...

Java Source Code

package org.solazo.swap;
//w  ww .j  a  va2 s.c  o  m
import android.app.Service;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Binder;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;

public class LocationService extends Service implements LocationListener {

  private static final String LOGTAG = "LocationService";

  private LocationManager manager;
  private Location currentLocation;
  private Location gpsLocation;
  private Location networkLocation;

  /* Service Setup Methods */
  @Override
  public void onCreate() {
    manager = (LocationManager) getSystemService(LOCATION_SERVICE);
    Log.i(LOGTAG, "Location Service Running...");
  }

  public void startTracking() {
    final boolean gpsEnabled = manager
        .isProviderEnabled(LocationManager.GPS_PROVIDER);
    final boolean networkEnabled = manager
        .isProviderEnabled(LocationManager.NETWORK_PROVIDER);
    if (!gpsEnabled && !networkEnabled) {
      Toast.makeText(this,
          "Please enable Location Service to use this app...",
          Toast.LENGTH_LONG).show();
      return;
    }
    Toast.makeText(this, "Determining Current Location...",
        Toast.LENGTH_LONG).show();

    networkLocation = requestUpdatesFromProvider(LocationManager.NETWORK_PROVIDER);
    gpsLocation = requestUpdatesFromProvider(LocationManager.GPS_PROVIDER);

    if (gpsLocation != null && networkLocation != null) {
      currentLocation = getBetterLocation(gpsLocation, networkLocation);
    } else if (gpsLocation != null) {
      currentLocation = gpsLocation;
    } else if (networkLocation != null) {
      currentLocation = networkLocation;
    }
  }

  private Location requestUpdatesFromProvider(final String provider) {
    Location location = null;
    if (manager.isProviderEnabled(provider)) {
      manager.requestLocationUpdates(provider, 60000, 0, this);
    } else {
      location = manager.getLastKnownLocation(provider);
    }
    return location;
  }

  public void stopTracking() {
    manager.removeUpdates(this);
  }

  @Override
  public void onDestroy() {
    manager.removeUpdates(this);
    Log.i(LOGTAG, "Location Service Stopped...");
  }

  public Location getLocation() {
    return this.currentLocation;
  }

  /* Service Access Methods */
  public class LocationBinder extends Binder {
    LocationService getService() {
      return LocationService.this;
    }
  }

  private final IBinder binder = new LocationBinder();

  @Override
  public IBinder onBind(Intent intent) {
    return binder;
  }

  /* LocationListener Methods */
  @Override
  public void onLocationChanged(Location location) {
    this.currentLocation = location;
    Log.i(LOGTAG, "Adding new location");
    Log.i(LOGTAG,
        currentLocation.getLatitude() + ", "
            + currentLocation.getLongitude());
    Toast.makeText(
        this,
        String.format(currentLocation.getLatitude() + ", "
            + currentLocation.getLongitude()), Toast.LENGTH_SHORT)
        .show();
  }

  @Override
  public void onProviderDisabled(String provider) {
  }

  @Override
  public void onProviderEnabled(String provider) {
  }

  @Override
  public void onStatusChanged(String provider, int status, Bundle extras) {
  }

  protected Location getBetterLocation(Location newLocation,
      Location currentBestLocation) {
    if (currentBestLocation == null) {
      // A new location is always better than no location
      return newLocation;
    }

    // Check whether the new location fix is newer or older
    long timeDelta = newLocation.getTime() - currentBestLocation.getTime();
    boolean isSignificantlyNewer = timeDelta > 120000;
    boolean isSignificantlyOlder = timeDelta < -120000;
    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 newLocation;
      // If the new location is more than two minutes older, it must be
      // worse
    } else if (isSignificantlyOlder) {
      return currentBestLocation;
    }

    // Check whether the new location fix is more or less accurate
    int accuracyDelta = (int) (newLocation.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(newLocation.getProvider(),
        currentBestLocation.getProvider());

    // Determine location quality using a combination of timeliness and
    // accuracy
    if (isMoreAccurate) {
      return newLocation;
    } else if (isNewer && !isLessAccurate) {
      return newLocation;
    } else if (isNewer && !isSignificantlyLessAccurate
        && isFromSameProvider) {
      return newLocation;
    }
    return currentBestLocation;
  }

  private boolean isSameProvider(String provider1, String provider2) {
    if (provider1 == null) {
      return provider2 == null;
    }
    return provider1.equals(provider2);
  }

}

Java Source Code List

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