uk.ac.horizon.ubihelper.service.channel.GpsStatusChannel.java Source code

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Here is the source code for uk.ac.horizon.ubihelper.service.channel.GpsStatusChannel.java

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/**
 * Copyright (c) 2012 The University of Nottingham
 * 
 * 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

    }
}