Android Open Source - sigimera-android-app Location Controller

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * Sigimera Crises Information Platform Android Client
 * Copyright (C) 2012 by Sigimera//from  w  w w.  j  a va  2s.co m
 * All Rights Reserved
 * 
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package org.sigimera.app.android.controller;

import org.sigimera.app.android.exception.AuthenticationErrorException;
import org.sigimera.app.android.model.Constants;

import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;

/**
 * Handle the location found via network or GPS.
 * @author Corneliu-Valentin Stanciu
 * @e-mail  corneliu.stanciu@sigimera.org
 */
public class LocationController {  
  
  private static LocationController instance = null;

  private LocationManager locationManager = null;
  
  /**
   * Singleton pattern
   */
  public static LocationController getInstance() {
    if ( instance == null ) instance = new LocationController();
    return instance;
  }  
  
  private LocationController() {
    // Acquire a reference to the system Location Manager
    Context context = ApplicationController.getInstance().getApplicationContext();
    if ( context != null )
      locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
    else
      Log.e(Constants.LOG_TAG_LOCATION_CONTROLLER, "The context is null! We cannot update the location");
    
    // Define a listener that responds to location updates
    LocationListener locationListener = new LocationListener() {
        public void onLocationChanged(Location location) {
          // Called when a new location is found by the network location provider.
          Log.i(Constants.LOG_TAG_LOCATION_CONTROLLER, "Found new location: " + location);
          
          if ( ApplicationController.getInstance().isEverythingUpdated() ) {
          try {
            final String auth_token = ApplicationController.getInstance().getSessionHandler().getAuthenticationToken();
            PersistanceController.getInstance().updateNearCrises(auth_token, 1, location);
          } catch (AuthenticationErrorException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
          }
          }
        }

        public void onProviderEnabled(String provider) {}

        public void onProviderDisabled(String provider) {}

      @Override
      public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
        // TODO Auto-generated method stub      
      }
      };

    // Register the listener with the Location Manager to receive location updates
    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 5000, locationListener);
  }
  
  /**
   * Get the last known location saved via network
   * @return location Includes GPS coordinates, the time when was found, accuracy, etc
   */
  public Location getLastKnownLocation() {
    return locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
  }
  
}

Java Source Code List

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