DatagramSocket的Android上失敗， '再試一次'

Question

我想在我的Android應用程序中發送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()); 

我收到以下錯誤：

Try again

我缺少的東西這裏？

Answer 1

好發送UDP你需要類似於：

服務器：

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); 

客戶：

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(); 

參考文獻：

• Simple UDP communication example