Android Open Source - ubihelper Location Channel

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Back to project page ubihelper.

License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * Copyright (c) 2012 The University of Nottingham
 * //  w  w  w  . jav  a  2 s  . com
 * This file is part of ubihelper
 *
 *  ubihelper is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  ubihelper 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with ubihelper. If not, see <http://www.gnu.org/licenses/>.
 *  
 *  @author Chris Greenhalgh (cmg@cs.nott.ac.uk), The University of Nottingham
 */
package uk.ac.horizon.ubihelper.service.channel;

import java.util.LinkedList;
import java.util.List;

import org.json.JSONException;
import org.json.JSONObject;

import uk.ac.horizon.ubihelper.channel.NamedChannel;
import uk.ac.horizon.ubihelper.service.Service;

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

/**
 * @author cmg
 *
 */
public class LocationChannel extends NamedChannel implements LocationListener {

  private static final String TAG = "ubihelper-location";
  static final float MIN_DISTANCE = 0;
  private String provider;
  private LocationManager location;
  
  public static List<String> getAllProviders(Service service) {
    LocationManager location = (LocationManager)service.getSystemService(Service.LOCATION_SERVICE);
    if (location!=null) {
      return location.getAllProviders();
    }
    else {
      Log.w(TAG, "No LocationManager");
      return new LinkedList<String>();
    }
  }
  public LocationChannel(String name, Service service, String provider) {
    super(name);
    this.provider = provider;
    location = (LocationManager)service.getSystemService(Service.LOCATION_SERVICE);
  }

  @Override
  protected void handleStart() {
    if (location!=null) {
      try {
        location.requestLocationUpdates(provider, (long)(period*1000), MIN_DISTANCE, this);        
        Log.d(TAG,"Start location updates "+name);  
      } catch (Exception e) {
        Log.w(TAG,"Error requesting updates for "+provider+": "+e);
      }
      if (!location.isProviderEnabled(provider)) {
        Log.d(TAG,"Provider "+provider+" not enabled");
      }
    }
  }

  @Override
  protected void handleStop() {
    Log.d(TAG, "Stop location "+name);
    if (location!=null)
      location.removeUpdates(this);
  }

  public void onLocationChanged(Location loc) {
    // TODO Auto-generated method stub
    JSONObject value = new JSONObject();
    try {
      // event time is in nanoseconds
      value.put("timestamp", System.currentTimeMillis());
      value.put("time", loc.getTime());
      value.put("lat", loc.getLatitude());
      value.put("lon", loc.getLongitude());
      value.put("provider", loc.getProvider());
      if (loc.hasAltitude())
        value.put("altitude", loc.getAltitude());
      if (loc.hasAccuracy())
        value.put("accuracy", loc.getAccuracy());
      Log.d(TAG,"onSensorChanged("+name+"): "+value);
    } catch (JSONException e) {
      /* ignore */
    }
    onNewValue(value);
    
  }
  public void onProviderDisabled(String arg0) {
    // TODO Auto-generated method stub
    
  }
  public void onProviderEnabled(String arg0) {
    // TODO Auto-generated method stub
    
  }
  public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
    // TODO Auto-generated method stub
    
  }
}

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