android socketed 连接服务器

socket 实现android手机链接服务器，现在服务器直接没数据，请教下是不是发送数据有问题呀？

 public static  TcpClient instance()
    {

        if (s_Tcp == null)
        {
            s_Tcp = new TcpClient(Const.SOCKET_SERVER, Const.SOCKET_PORT);
        }
        return s_Tcp;
    }
         public TcpClient(String HostIp, int HostPort)
    {
        this.hostIp = HostIp;
        this.hostPort = HostPort;

        try {
            socket = RequestSocket(Const.SOCKET_SERVER, Const.SOCKET_PORT);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
         private Socket RequestSocket(String host, int port)
            throws UnknownHostException, IOException {
        Socket ConSocket = new Socket();
        //创建套接字地址，其中 IP 地址为通配符地址，端口号为指定值。
        //有效端口值介于 0 和 65535 之间。端口号 zero 允许系统在 bind 操作中挑选暂时的端口。
        isa = new InetSocketAddress(host, port);
        //建立一个远程链接
        ConSocket.connect(isa);

        return ConSocket;
    }
        private void SendMsg(byte[]bytes) throws IOException {
        writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
        writer.write(String.valueOf(bytes));
        writer.flush();
    }
        public boolean canConnectToServer(byte[] bytes)
    {
        try
        {
            if (socket != null)
            {
                Log.e("socketed",socket.toString());
                SendMsg(bytes);
            }
        } catch (IOException e)
        {
            // TODO Auto-generated catch block
            Log.e("sendmsg","Send timeout");
            return false;
        }
        catch (Exception e){
            Log.e("socket","socket disconnect");
            return false;
        }
                }

http://blog.csdn.net/c5153000/article/details/6546576