我有一个 AsyncTask 在后台创建udp套接字的扩展程序类，当客户端为ip广播时，它返回ip。但有时有用，有时不行。我试着提高优先级 Thread.currentThread().setPriority(Thread.MAX_PRIORITY); 但是有点进步。
这是我的类背景方法：

protected Void doInBackground(String ... strings) {
        Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
        byte[] messageBytes = new byte[1024];
        DatagramPacket received = new DatagramPacket(messageBytes, messageBytes.length);

        try {
            Log.d(TAG, "udp port: "+port);
            DatagramSocket datagramSocket = new DatagramSocket(port);
            this.ready=true;

            while (running){

                try {
                    datagramSocket.receive(received);
                } catch (IOException e) {

                }
                String message = new String(messageBytes, 0, received.getLength());

                if (message.equals(question)){

                    try {
                        InetAddress clientIP=received.getAddress();
                        byte[] msg=answer.getBytes();
                        DatagramPacket toSend=new DatagramPacket(msg,msg.length,clientIP, port);
                        datagramSocket.send(toSend);
                    } catch (IOException e) {

                    }
                }

                try {
                    Thread.sleep(10);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

            }

            datagramSocket.close();

        } catch (SocketException e) {
            this.ready=false;
        }

        return null;
    }

我就是这么说的 mainActivity :

TCPServer connectionManager=new TCPServer(); //My main TCP Server Object
connectionManager.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);    

UDPBroadcastResponder udpBroadcastResponder;//to find server ip

int udpPort=1793;    //Find a port not in use
do {
    udpBroadcastResponder = new UDPBroadcastResponder(udpPort,
            "Who is Stone-Hole Server?", "TCP-IP");
    udpBroadcastResponder.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);

    try {
        Thread.sleep(100);
    } catch (InterruptedException e) {

    }

    if (!udpBroadcastResponder.isReady()) {
        udpBroadcastResponder.close();
        udpBroadcastResponder.cancel(true);
    }

    udpPort++;
}while ((!udpBroadcastResponder.isReady())&(udpBroadcastResponder.getPort()<1800));//check 7 ports

这是我的网络流量。400毫秒响应后发送的每条消息应为tcp ip:
谁是石洞服务器？
谁是石洞服务器？tcp ip
谁是石洞服务器？tcp ip
谁是石洞服务器？tcp ip
谁是石洞服务器？tcp ip
谁是石洞服务器？
谁是石洞服务器？
谁是石洞服务器？
谁是石洞服务器？
谁是石洞服务器？
谁是石洞服务器？
... 有时需要5分钟以上才能再次响应