一个朋友做的。实现内部聊天功能，支持模糊查询用户，按组分好友，跟好友聊天，发送表情，设置个头像和其他信息，好友发送消息提示。包含数据库-A friend did. Achieve internal chat function to support fuzzy queries the user, by components of friends, chatting with your friends, send expression, set a picture and other informa