客户端套接字 - 保持套接字无限期打开

Question

我正在开发我的第一个Java / Android套接字应用程序，它将充当发送/接收套接字客户端。我有一个现有的应用程序（服务器）通过套接字使用xml进行通信。此服务器可以随时向连接的客户端发送信息，因此我必须在创建套件后无限期地保持套接字打开。以下代码似乎部分正确，因为我可以发送和接收直接回复，但是，我无法收到未经请求的消息？

public void Connect(String ip, int port)
{
    try
    {
        InetAddress inetAddress = InetAddress.getByName(ip);
        Socket socket = new Socket(inetAddress, port);
        mConnected = true;

        try
        {
            mOutputStream = socket.getOutputStream();
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(1024);
            byte[] buffer = new byte[1024];

            int bytesRead;
            InputStream inputStream = socket.getInputStream();

            new Thread(new NetworkConnectHandler()).start();

            while (socket.isConnected())
            {
                while ((bytesRead = inputStream.read(buffer)) != -1)
                {
                    mReceivedPacket = null;
                    byteArrayOutputStream.write(buffer, 0, bytesRead);
                    mReceivedPacket = byteArrayOutputStream.toString("UTF-8");


                    if (mReceivedPacket.indexOf(STX) > -1 && mReceivedPacket.indexOf(ETX) > -1)
                    {
                        break;
                    }
                }

                byteArrayOutputStream.reset();

                if (mReceivedPacket != null)
                {
                    IncomingPacketHandler(XmlFromString(CleanIncomingPacket(mReceivedPacket)));
                }
            }
        }
        catch (Exception ex)
        {
            Log.e("Network Connect", "S: Error", ex);
        }

    }
    catch (Exception ex)
    {
        Log.e("Network Connect", "C: Error", ex);
    }
}

public class NetworkConnectHandler implements Runnable
{
    @Override
    public void run() {
        ConnectHandler();
    }
}

protected void ConnectHandler()
{
    Log.e("ConnectHandler", "Connected");
    SendDoc(CreateIDPacket());
}

SendDoc在Connect方法中创建的同一套接字上向服务器发送初始消息。所有已发送的消息都将从服务器收到响应。在这种情况下，将发送消息并接收响应。