说明：  网络传输功能中，将android设定为client端，pc端以linux系统当作server端来使用，android端可发送数据到server端，由server端来接收，而server端也可发送数据给client端，由client端来接收数据。
(Network transmission function, the android is set to client side, pc linux client to use the system as a server-side, android client can send data to the server side, to receive from the server side, while the server side can send data to the client-side , to receive data from the client side.)