Question

我正在尝试在我的Android应用程序中发送DatagramPackets（UDP）：

//create a byte to receive data
mClientSocket = new DatagramSocket();
byte[] receiveData = new byte[MAX_RECEIVE_DATA_SIZE_BYTES];
DatagramPacket receivePacket = new DatagramPacket(receiveData,
        receiveData.length);

// Set a receive timeout
mClientSocket.setSoTimeout(timeout);

// receive the packet
mClientSocket.receive(receivePacket);

return new String(receivePacket.getData(), 0,
        receivePacket.getLength());

我收到以下错误：

再试一次

我在这里错过了什么吗？

Answer 1

发送UDP你需要类似的东西：

服务器：

String  messageStr="Hello Android!";
int server_port = 12345;
DatagramSocket  s = new DatagramSocket ();
InetAddress  local = InetAddress .getByName("192.168.1.102");
int msg_length=messageStr.length();
byte[] message = messageStr.getBytes();
DatagramPacket  p = new DatagramPacket (message, msg_length,local,server_port);
s.send(p);

客户端：

String  text;
int server_port = 12345;
byte[] message = new byte[1500];
DatagramPacket  p = new DatagramPacket (message, message.length);
DatagramSocket  s = new DatagramSocket (server_port);
s.receive(p);
text = new String (message, 0, p.getLength());
Log.d("Udp tutorial","message:" + text);
s.close();

<强>参考文献：

Simple UDP communication example

使用“再试一次”，Android上的DatagramSocket失败

1 个答案: