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

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Here is the source code for uk.ac.horizon.ubihelper.service.channel.CellStrengthChannel.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 org.json.JSONException;
import org.json.JSONObject;

import android.app.Service;
import android.content.BroadcastReceiver;
import android.telephony.CellLocation;
import android.telephony.PhoneStateListener;
import android.telephony.SignalStrength;
import android.telephony.TelephonyManager;
import android.telephony.cdma.CdmaCellLocation;
import android.telephony.gsm.GsmCellLocation;
import uk.ac.horizon.ubihelper.channel.NamedChannel;

/**
 * @author cmg
 *
 */
public class CellStrengthChannel extends NamedChannel {
    private TelephonyManager telephony;
    private Service service;

    /**
     * @param name
     */
    public CellStrengthChannel(Service service, String name) {
        super(name);
        this.service = service;
        telephony = (TelephonyManager) service.getSystemService(Service.TELEPHONY_SERVICE);
    }

    private PhoneStateListener listener = new PhoneStateListener() {

        @Override
        public void onCellLocationChanged(CellLocation location) {
            update(location, null);
        }

        /* (non-Javadoc)
         * @see android.telephony.PhoneStateListener#onSignalStrengthsChanged(android.telephony.SignalStrength)
         */
        @Override
        public void onSignalStrengthsChanged(SignalStrength signalStrength) {
            update(null, signalStrength);
        }

    };

    @Override
    protected void handleStart() {
        if (telephony != null) {
            telephony.listen(listener,
                    PhoneStateListener.LISTEN_SIGNAL_STRENGTHS | PhoneStateListener.LISTEN_CELL_LOCATION);
        }
    }

    protected void update(CellLocation loc, SignalStrength ss) {
        if (loc == null && telephony != null)
            loc = telephony.getCellLocation();
        // TODO Auto-generated method stub
        JSONObject value = new JSONObject();
        try {
            value.put("timestamp", System.currentTimeMillis());
            if (loc instanceof GsmCellLocation) {
                GsmCellLocation gsm = (GsmCellLocation) loc;
                if (gsm.getCid() != (-1))
                    value.put("cid", gsm.getCid());
                if (gsm.getLac() != (-1))
                    value.put("lac", gsm.getLac());
                value.put("type", "gsm");
            } else if (loc instanceof CdmaCellLocation) {
                CdmaCellLocation cdma = (CdmaCellLocation) loc;
                if (cdma.getBaseStationId() != (-1))
                    value.put("baseStationId", cdma.getBaseStationId());
                if (cdma.getBaseStationLatitude() != Integer.MAX_VALUE)
                    value.put("baseStationLat", cdma.getBaseStationLatitude());
                if (cdma.getBaseStationLongitude() != Integer.MAX_VALUE)
                    value.put("baseStationLon", cdma.getBaseStationLongitude());
                if (cdma.getNetworkId() != (-1))
                    value.put("baseStationId", cdma.getNetworkId());
                if (cdma.getNetworkId() != (-1))
                    value.put("networkId", cdma.getNetworkId());
                if (cdma.getSystemId() != (-1))
                    value.put("systemId", cdma.getSystemId());
                value.put("type", "cdma");
            } else if (loc != null) {
                value.put("type", loc.getClass().getName());
            }

            if (ss != null) {
                if (ss.getCdmaDbm() != (-1))
                    value.put("cdmsDbm", ss.getCdmaDbm());
                if (ss.getCdmaEcio() != (-1))
                    value.put("cdmaEcio", ss.getCdmaEcio());
                if (ss.getEvdoDbm() != (-1))
                    value.put("evdoDbm", ss.getEvdoDbm());
                if (ss.getEvdoEcio() != (-1))
                    value.put("evdiEcio", ss.getEvdoEcio());
                if (ss.getEvdoSnr() != (-1))
                    value.put("evdoSnr", ss.getEvdoSnr());
                if (ss.getGsmBitErrorRate() != (-1))
                    value.put("gsmBER", ss.getGsmBitErrorRate());
                if (ss.getGsmSignalStrength() != (-1))
                    value.put("gsmSS", ss.getGsmSignalStrength());
                value.put("gsm", ss.isGsm());
            }
        } catch (JSONException e) {
            // shouldn't
        }
        onNewValue(value);
    }

    @Override
    protected void handleStop() {
        if (telephony != null)
            telephony.listen(listener, PhoneStateListener.LISTEN_NONE);
    }

}