if (sender != null && !sender.isAlive())
                    {
                        sender.run();  <===标记
                        Log.i(TAG_LISTENER, "$ServerSender back to running");
                    }
                    else if (sender == null)
                    {
                        sender = new ServerSender(serverSocket);
                        sender.start();
                        Log.i(TAG_LISTENER,
                                "$ServerSender started in ServerListener");
                    }