de.tud.kitchen.android.NTPTimeReceiver.java Source code

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Here is the source code for de.tud.kitchen.android.NTPTimeReceiver.java

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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 * 
 * Contributor(s):
 *    Marcus Staender <staender@tk.informatik.tu-darmstadt.de>
 *    Aristotelis Hadjakos <telis@tk.informatik.tu-darmstadt.de>
 *    Niklas Lochschmidt <nlochschmidt@gmail.com>
 *    Christian Klos <christian.klos@stud.tu-darmstadt.de>
 *    Bastian Renner <bastian.renner@stud.tu-darmstadt.de>
 *
 */

package de.tud.kitchen.android;

import java.io.IOException;
import java.net.InetAddress;
import java.net.SocketException;

import org.apache.commons.net.ntp.NTPUDPClient;
import org.apache.commons.net.ntp.TimeInfo;

import android.os.AsyncTask;
import android.widget.ImageView;
import android.widget.TextView;

/**
 * 
 * @author Niklas Lochschmidt <niklas.lochschmidt@stud.tu-darmstadt.de>
 *
 */
public class NTPTimeReceiver extends AsyncTask<InetAddress, Integer, Void> {

    private ImageView statusIcon;
    private TextView offsetText;

    public NTPTimeReceiver(TextView offsetText, ImageView statusIcon) {
        this.offsetText = offsetText;
        this.statusIcon = statusIcon;
    }

    @Override
    protected Void doInBackground(InetAddress... params) {
        NTPUDPClient client = new NTPUDPClient();
        client.setDefaultTimeout(10000);
        try {
            client.open();
        } catch (final SocketException se) {
            se.printStackTrace();
            return null;
        }
        while (!this.isCancelled()) {
            try {
                TimeInfo info = client.getTime(params[0]);
                info.computeDetails();
                Long offsetValue = info.getOffset();
                int receiverTimeDelta = (offsetValue == null) ? 0 : offsetValue.intValue();
                publishProgress(receiverTimeDelta);
            } catch (final IOException ioe) {
                ioe.printStackTrace();
                continue;
            }

            try {
                Thread.sleep(1000 * 60);
            } catch (InterruptedException e) {
                continue;
            }
        }
        client.close();
        return null;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        statusIcon.setImageResource(android.R.drawable.presence_away);
    }

    @Override
    protected void onPostExecute(Void result) {
        super.onPostExecute(result);
        offsetText.setText(String.valueOf(0));
        statusIcon.setImageResource(android.R.drawable.presence_offline);
    }

    @Override
    protected void onProgressUpdate(Integer... values) {
        super.onProgressUpdate(values);
        offsetText.setText(String.valueOf(values[0]));
        statusIcon.setImageResource(android.R.drawable.presence_online);
    }

    @Override
    protected void onCancelled() {
        super.onCancelled();
        offsetText.setText(String.valueOf(0));
        statusIcon.setImageResource(android.R.drawable.presence_offline);
    }

}