我正在尝试使用多播套接字。我编写了一个服务器，向Android客户端发送消息。目前为止，客户端只应记录接收到的消息。
我注意到我的设备没有接收到任何多播数据包。
以下是服务器的代码（在PC上运行）：
以下是服务器的代码（在PC上运行）：
public class MulticastServer{
private int port;
private boolean running = false;
private MulticastSocket serverSocket;
private InetAddress group;
private String multicastAddress = "230.192.0.11";
public MulticastServer(int port) {
super();
this.port = port;
init();
}
public MusicStreamerServer() {
this(5500);
}
private void init() {
try {
group = InetAddress.getByName(multicastAddress);
serverSocket = new MulticastSocket(port);
serverSocket.joinGroup(group);
} catch (IOException e) {
e.printStackTrace();
}
}
public void start() throws IOException {
System.out.println("server started");
if (running)
return;
running = true;
new Thread(new Runnable() {
@Override
public void run() {
byte[] buf = new byte[1024];
DatagramPacket packet = new DatagramPacket(buf, buf.length,
group, port);
String msg = "msg";
while (running) {
packet.setData(msg.getBytes(), 0, msg.length());
try {
serverSocket.send(packet);
} catch (IOException e) {
e.printStackTrace();
}
}
}
}).start();
}
public void stop() throws IOException {
running = false;
} }
这里是安卓客户端的代码：
public class MainActivity extends Activity {
private MulticastSocket socket;
private InetAddress group;
private String multicastAddress = "230.192.0.11";
private int port = 5500;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
private void init() {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
try {
group = InetAddress.getByName(multicastAddress);
socket = new MulticastSocket(port);
socket.joinGroup(group);
socket.setBroadcast(true);
} catch (IOException e) {
e.printStackTrace();
Log.wtf("init", e.getMessage());
}
new Thread(new Runnable() {
@Override
public void run() {
WifiManager wm = (WifiManager) getSystemService(Context.WIFI_SERVICE);
WifiManager.MulticastLock multicastLock = wm
.createMulticastLock("mylock");
multicastLock.acquire();
byte[] buf = new byte[1024];
while (true) {
try {
socket.receive(packet);
Log.d("receiver","received = " + (new String(packet.getData())));
} catch (IOException e) {
e.printStackTrace();
}
}
}
}).start();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}}
我已经使用两个不同的设备进行了代码测试。Nexus4和Nexus7（2013）都运行着最新的Android系统。
有人可以帮我吗？
谢谢