问题描述
因此,我正在发送一个多播数据包以发现任何可用的服务,而我得到的第一个答复是我首先发送的消息。
// create socket
InetAddress addr = InetAddress.getByName(host);
MulticastSocket socket = new MulticastSocket(port);
socket.joinGroup(addr);
// send ping
byte[] byteArray = PING.getBytes();
DatagramPacket packet =
new DatagramPacket(byteArray,byteArray.length,addr,port);
socket.send(packet,(byte) 255);
// listen for pong
byteArray = PONG.getBytes();
packet = new DatagramPacket(byteArray,byteArray.length);
socket.setSoTimeout(2000);
socket.receive(packet); // Todo: first message is echo from me!!!
socket.receive(packet);
String response = new String(packet.getData());
Toast toast = Toast.makeText(context,\"Received \'\" + response +
\"\' from \" + packet.getAddress(),Toast.LENGTH_LONG);
toast.show();
如何阻止这种情况发生?
解决方法
您要设置多播套接字环回模式:
socket.setLoopbackMode(true); // Amusingly,this parameter is a disable
可以在Android网站上找到更多信息。