成员的完整列表，这些成员属于 com.netease.lava.nertc.sdk.NERtcConstants.ChannelMediaRelayEvent,包括所有继承而来的类成员

MEDIARELAY_EVENT_AUDIOSENTSUCCESS	com.netease.lava.nertc.sdk.NERtcConstants.ChannelMediaRelayEvent
MEDIARELAY_EVENT_CONNECTED	com.netease.lava.nertc.sdk.NERtcConstants.ChannelMediaRelayEvent
MEDIARELAY_EVENT_CONNECTING	com.netease.lava.nertc.sdk.NERtcConstants.ChannelMediaRelayEvent
MEDIARELAY_EVENT_DISCONNECT	com.netease.lava.nertc.sdk.NERtcConstants.ChannelMediaRelayEvent
MEDIARELAY_EVENT_FAILURE	com.netease.lava.nertc.sdk.NERtcConstants.ChannelMediaRelayEvent
MEDIARELAY_EVENT_OTHERSTREAMSENTSUCCESS	com.netease.lava.nertc.sdk.NERtcConstants.ChannelMediaRelayEvent
MEDIARELAY_EVENT_VIDEOSENTSUCCESS	com.netease.lava.nertc.sdk.NERtcConstants.ChannelMediaRelayEvent