Android Open Source - location-data G P S Tracker

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.example.locationtracker;
/* ww w.jav a 2s  .  c  o m*/
/*
 * Tracks GPS data and sends it to the CachedRequester.
 */

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import junit.framework.Assert;
import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;

// to fiddle with emulator's location do:
// telnet localhost 5554
// geo fix <lat> <lng>

class LocationPrintCallback implements ILocationCallback {
  public void call(Location location) {
    System.out.println(location.toString());
  }
}

class LocationStoreCallback implements ILocationCallback {
  private CachedRequester cachedRequester;

  LocationStoreCallback(CachedRequester cachedRequester) {
    this.cachedRequester = cachedRequester;
  }
  
  public void call(Location location) {
    this.cachedRequester.store(new GeoLocation(location.getLatitude(), location.getLongitude()));
  }
}

public class GPSTracker {

  private Activity parentActivity;
  private LocationManager locationManager;
  private LocationListener locationListener;
  private List<ILocationCallback> locationUpdateMethods;
  private CachedRequester cachedRequester;
  
  private LocationStoreCallback locationStoreCallback;
  
  // debugging
  private LocationPrintCallback locationPrintCallback;
  
  public GPSTracker(Activity parentActivity) {
    this.locationUpdateMethods = new ArrayList<ILocationCallback>();
    this.parentActivity = parentActivity;
    Assert.assertNotNull("parentActivity cannot be null", parentActivity);
    // Acquire a reference to the system Location Manager
    this.locationManager = (LocationManager) this.parentActivity.getSystemService(Context.LOCATION_SERVICE);
    
    this.setupLocationListener();
    
    this.cachedRequester = new CachedRequester(this.parentActivity);
    this.locationStoreCallback = new LocationStoreCallback(this.cachedRequester);
    this.onLocationUpdate(this.locationStoreCallback);
    
    // debugging
    this.locationPrintCallback = new LocationPrintCallback();
    this.onLocationUpdate(this.locationPrintCallback);
  }
  
  private void setupLocationListener() {
    // Define a listener that responds to location updates
    this.locationListener = new LocationListener() {
      public void onLocationChanged(Location location) {
        // Called when a new location is found by the network location provider.
        //makeUseOfNewLocation(location);
        
        iterateLocationUpdateFunctions(location);
      }

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

      public void onProviderEnabled(String provider) {}

      public void onProviderDisabled(String provider) {}
    };

    // Register the listener with the Location Manager to receive location updates
    // NOTE: listen only the GPS_PROVIDER, not the NETWORK_PROVIDER
    this.locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this.locationListener);
  };
  
  private void iterateLocationUpdateFunctions(Location location) {
    for (Iterator<ILocationCallback> iter = this.locationUpdateMethods.iterator(); iter.hasNext(); ) {
        ILocationCallback callback = iter.next();
        
        callback.call(location);
    }
    
  }
  
  public void onLocationUpdate(ILocationCallback callback) {
    locationUpdateMethods.add(callback);
  }

  public void connected() {
    this.cachedRequester.connected();
    
  }
}

Java Source Code List

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