1package com.netease.nimlib.sdk.msg;
3import com.netease.nimlib.invocation.ObserverInterface;
4import com.netease.nimlib.sdk.Observer;
5import com.netease.nimlib.sdk.msg.model.SystemMessage;
void observeReceiveSystemMsg(Observer< SystemMessage > observer, boolean register)
注册/注销系统消息接收事件观察者
void observeUnreadCountChange(Observer< Integer > observer, boolean register)
注册/注销系统消息未读数变化事件观察者