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

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

    }
}