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

addListener(EMPresenceListener listener)	com.hyphenate.chat.EMPresenceManager
clearListeners()	com.hyphenate.chat.EMPresenceManager
EMPresenceManager(EMAPresenceManager presenceManager) (定义于 com.hyphenate.chat.EMPresenceManager)	com.hyphenate.chat.EMPresenceManager
fetchPresenceStatus(List< String > members, EMValueCallBack< List< EMPresence > > callBack)	com.hyphenate.chat.EMPresenceManager
fetchSubscribedMembers(int pageNum, int pageSize, EMValueCallBack< List< String > > callBack)	com.hyphenate.chat.EMPresenceManager
publishPresence(String ext, EMCallBack callBack)	com.hyphenate.chat.EMPresenceManager
removeListener(EMPresenceListener listener)	com.hyphenate.chat.EMPresenceManager
subscribePresences(List< String > members, long expiry, EMValueCallBack< List< EMPresence > > callBack)	com.hyphenate.chat.EMPresenceManager
unsubscribePresences(List< String > members, EMCallBack callBack)	com.hyphenate.chat.EMPresenceManager