Android Open Source - walkitalkie Network Hub

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License

The source code is released under:

Apache License

Java Source Code

/* Copyright 2011 Chuck Atkins
 */*from w w  w. j  a v  a 2s  .  co  m*/
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * 
 */

package org.miloss;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileDescriptor;
import java.io.IOException;
import java.net.DatagramSocket;
import java.net.InetAddress;

import android.content.Context;
import android.net.DhcpInfo;
import android.net.LocalSocket;
import android.net.wifi.WifiManager;

/**
 * 
 *
 */
public class NetworkHub {
  DatagramSocket mNet;
  LocalSocket mLocal;

  Thread mNet2Local;
  Thread mLocal2Net;

  /**
   * Initialize a UDP communication path accessible via a file descriptor
   * 
   * @param ctx
   *            The Application context
   * @param port
   *            The UDP port to talk over
   */
  public NetworkHub(Context ctx, int port) throws IOException {
    mNet = new DatagramSocket(port, getWifiBroadcastAddress(ctx));
    mLocal = new LocalSocket();
    
    new BufferedOutputStream(mLocal.getOutputStream());
    
    // Launch the socket IO threads
    mLocal2Net = new Thread(
      new DatagramWriterThread(mNet, 
        new BufferedInputStream(mLocal.getInputStream())));
    
    mLocal2Net.start();
    
    mNet2Local = new Thread(
      new DatagramReaderThread(mNet, 
        new BufferedOutputStream(mLocal.getOutputStream())));
    mNet2Local.start();
  }

  /**
   * Retrieve the file descriptor that can be used to read and write to the
   * network connection
   * 
   * @return
   */
  public FileDescriptor getFileDescriptor() {
    return mLocal.getFileDescriptor();
  }

  /**
   * Shamelessly taken from
   * http://code.google.com/p/boxeeremote/wiki/AndroidUDP
   * 
   * @return
   * @throws IOException
   */
  protected InetAddress getWifiBroadcastAddress(Context ctx)
      throws IOException {
    WifiManager wifi = (WifiManager) ctx
        .getSystemService(Context.WIFI_SERVICE);
    DhcpInfo dhcp = wifi.getDhcpInfo();
    // handle null somehow

    int broadcast = (dhcp.ipAddress & dhcp.netmask) | ~dhcp.netmask;
    byte[] quads = new byte[4];
    for (int k = 0; k < 4; k++)
      quads[k] = (byte) ((broadcast >> k * 8) & 0xFF);
    return InetAddress.getByAddress(quads);
  }
}

Java Source Code List

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