(The chat system designed based on Android uses sqlserver2005 database, with a total of four tables yq_ Buddy is an old friend information form yd_ Group is the group information table yq_ group_ Member is the group member information table yq_ User is the user information table YQ_ Server is a server program YQ is a mobile phone client program. The server runs on the computer. I use two simulators to test the monitor. The 5469 port is the server program. I can end the process first. After restarting, the server server has started inMonNov0521:43:37CST2012. The server will listen to the 5469 port. OK. Next, the client logs in. The whole chat process uses the bubble mode to display the system program My tests given to me by friends are like that I can't add old friends through the interface, but I can only add them in the database)