成员的完整列表，这些成员属于 com.netease.nimlib.sdk.v2.avsignalling.V2NIMSignallingListener,包括所有继承而来的类成员

onMultiClientEvent(V2NIMSignallingEvent event)	com.netease.nimlib.sdk.v2.avsignalling.V2NIMSignallingListener
onOfflineEvent(List< V2NIMSignallingEvent > events)	com.netease.nimlib.sdk.v2.avsignalling.V2NIMSignallingListener
onOnlineEvent(V2NIMSignallingEvent event)	com.netease.nimlib.sdk.v2.avsignalling.V2NIMSignallingListener
onSyncRoomInfoList(List< V2NIMSignallingRoomInfo > channelRooms)	com.netease.nimlib.sdk.v2.avsignalling.V2NIMSignallingListener