[問題] wifi 廣播問題

[jimmylo (迷路的小孩)]

程式我主要參考
http://ppt.cc/eXN@

http://blog.xuite.net/ffc99a3b/ooxx/42960121

http://blog.xuite.net/ffc99a3b/ooxx/42960271

這2兩個網站目標能夠在手機寫出傳送訊息給客戶端裡面的方法是UDP

問題是我傳送的訊息都有傳送出去

但是問題是我的接收那一端一直收不到訊息

該給的權限我都有給過了但是不知道問題出在哪!!

程式碼也沒問題放在手機也都能執行就是接收端收不到訊息


送出端程式碼

private static final String TAG = "Discovery";

private static final int DISCOVERY_PORT = 2562;

String requestString = "SendMessageTest" ;

        public void run() {
                try {
                        DatagramSocket socket = new DatagramSocket(

                                                     DISCOVERY_PORT);

                        socket.setBroadcast(true);

                        DatagramPacket packet = new DatagramPacket(

                                           requestString.getBytes(),

                                           requestString.length(),

                                           getBroadcastAddress(),

                                           DISCOVERY_PORT);

                socket.send(packet);

                ShowMessage.setText("i have send message");


                } catch (IOException e) {

                Log.e(TAG, "Could not send discovery request", e);

                ShowMessage.setText("i have not send message");

               }
        }





接收端程式碼

private static final String TAG = "Discovery";

private static final int DISCOVERY_PORT = 2562;

private static final int TIMEOUT_MS = 20000;

byte[] buf = new byte[1024];

public void run() {

  try {

       DatagramSocket socket = new DatagramSocket(DISCOVERY_PORT);

       socket.setBroadcast(true);

       socket.setSoTimeout(TIMEOUT_MS);

       while (true) {

             DatagramPacket packet = new DatagramPacket(buf, buf.length);

             socket.receive(packet);

             String s = new String(packet.getData(), 0, packet.getLength());

             ShowMessage.setText(s);

             }

       } catch (IOException e) {

             Log.e(TAG, "Could not send discovery request", e);

             ShowMessage.setText("Receive timed out");

            }

  }



傳送出去我有檢查過一下都有跑出我有傳送訊息

接收端每次都會跑出Receive timed out這個訊息

所以我現在不懂的地方是為甚麼我的接收端沒辦法接收到訊息呢??










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