一款基于安卓的简单聊天软件

代码说明：

可以注册登录、发送文字表情。 使用前请安装好mysql。 this is a android instant messenger based on socket communication basic functionality: 1. a user can register an account with a username, his/her age and gender 2. login with username and password 3. find out friends by username or particulars(age and gender) 4. chat with a friend with text and emoji 5. chatting history available for checking 6. messages sent to offline friends will be saved at server and pushed to that friend when he/she signs in 7. ringtone and vibration notification when a message arrived if messanger is not foreground