Android Open Source - ubihelper Gps Status Channel

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * Copyright (c) 2012 The University of Nottingham
 * //from w w w  .jav  a  2s.c  om
 * 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.JSONArray;
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.GpsSatellite;
import android.location.GpsStatus;
import android.location.GpsStatus.Listener;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;

/**
 * @author cmg
 *
 */
public class GpsStatusChannel extends NamedChannel implements Listener, LocationListener {

  private static final String TAG = "ubihelper-gpsstatus";
  private static final float NOMINAL_DISTANCE = 100;
  private LocationManager location;
  
  public GpsStatusChannel(String name, Service service) {
    super(name);
    location = (LocationManager)service.getSystemService(Service.LOCATION_SERVICE);
  }

  @Override
  protected void handleStart() {
    if (location!=null) {
      try {
        location.addGpsStatusListener(this);
        Log.d(TAG,"Start gpsStatus updates");  
        // force start GPS?!
        location.requestLocationUpdates("gps", (long)(period*1000), NOMINAL_DISTANCE, this);        

      } catch (Exception e) {
        Log.w(TAG,"Error requesting gpsStatus updates: "+e);
      }
    }
  }

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

  public void onGpsStatusChanged(int type) {
    if (location!=null) {
      GpsStatus status = location.getGpsStatus(null);
      JSONObject value = new JSONObject();
      try {
        // event time is in nanoseconds
        value.put("timestamp", System.currentTimeMillis());
        value.put("status", type);
        value.put("maxSatellites", status.getMaxSatellites());
        value.put("timeToFirstFix", status.getTimeToFirstFix());
        JSONArray sats = new JSONArray();
        value.put("satellites", sats);
        for (GpsSatellite satellite : status.getSatellites()) {
          JSONObject s= new JSONObject();
          s.put("used", satellite.usedInFix());
          s.put("azimuth", satellite.getAzimuth());
          s.put("elevation", satellite.getElevation());
          s.put("prn", satellite.getPrn());
          s.put("snr", satellite.getSnr());
          sats.put(s);
        }
        onNewValue(value);

      } catch (JSONException e) {
        /* ignore */
      }
    }    
  }

  public void onLocationChanged(Location location) {
    // TODO Auto-generated method stub
    
  }

  public void onProviderDisabled(String provider) {
    // TODO Auto-generated method stub
    
  }

  public void onProviderEnabled(String provider) {
    // TODO Auto-generated method stub
    
  }

  public void onStatusChanged(String provider, int status, Bundle extras) {
    // TODO Auto-generated method stub
    
  }
}

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