成员的完整列表，这些成员属于 com.hyphenate.chat.EMContact,包括所有继承而来的类成员

EMContact(String username)	com.hyphenate.chat.EMContact
getAddTimestamp()	com.hyphenate.chat.EMContact
getRemark()	com.hyphenate.chat.EMContact
getUserInfo()	com.hyphenate.chat.EMContact
getUsername()	com.hyphenate.chat.EMContact
setRemark(String remark)	com.hyphenate.chat.EMContact
setUsername(String username)	com.hyphenate.chat.EMContact
username	com.hyphenate.chat.EMContact	protected