create Multicast Socket - Android android.net

Android examples for android.net:ConnectivityManager

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Description

create Multicast Socket

Demo Code

import java.io.IOException;
import java.net.InetAddress;
import java.net.MulticastSocket;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.DhcpInfo;
import android.net.NetworkInfo;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.util.Log;

public class Main {

  private static final int MULTICAST_TTL = 255;

  public static MulticastSocket createMulticastSocket(Context context)
      throws UnknownHostException, SocketException, IOException {
    MulticastSocket multicastSocket = new MulticastSocket();

    if (connectedToEthernet(context)) {
      NetworkInterface netIf = NetworkInterface.getByName("eth0");
      if (netIf != null)
        multicastSocket.setNetworkInterface(netIf);
    } else if (isWirelessDirect(context)) {
      WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
      WifiInfo wifiInfo = wifiManager.getConnectionInfo();
      int intaddr = wifiInfo.getIpAddress();
      byte[] byteaddr = new byte[] { (byte) (intaddr & 0xff), (byte) (intaddr >> 8 & 0xff),
          (byte) (intaddr >> 16 & 0xff), (byte) (intaddr >> 24 & 0xff) };
      InetAddress addr = InetAddress.getByAddress(byteaddr);
      NetworkInterface netIf = NetworkInterface.getByInetAddress(addr);

      multicastSocket.setNetworkInterface(netIf);
    }/*  www . j a v  a 2 s.  co m*/
    multicastSocket.setTimeToLive(MULTICAST_TTL);
    return multicastSocket;
  }

  public static boolean isWirelessDirect(Context context) {
    ConnectivityManager connManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo netInfo = connManager.getActiveNetworkInfo();

    if (netInfo != null && netInfo.isConnected() && (netInfo.getType() == ConnectivityManager.TYPE_WIFI)) {
      WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
      DhcpInfo dhcpInfo = wifiManager.getDhcpInfo();

      if ((dhcpInfo != null) && (dhcpInfo.gateway == 0)) {
        Log.d("", "isWirelessDirect: probably wireless direct.");
        return true;
      }
    }
    return false;
  }

  private static boolean connectedToEthernet(Context context) {
    ConnectivityManager connMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo ethInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_ETHERNET);
    if (ethInfo == null) {
      return false;
    }
    return ethInfo.isConnectedOrConnecting();
  }

}

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