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

CONNECTION_STATE_CONNECTED	com.netease.lava.nertc.sdk.NERtcConstants.ConnectionState
CONNECTION_STATE_CONNECTING	com.netease.lava.nertc.sdk.NERtcConstants.ConnectionState
CONNECTION_STATE_DISCONNECTED	com.netease.lava.nertc.sdk.NERtcConstants.ConnectionState
CONNECTION_STATE_FAILED	com.netease.lava.nertc.sdk.NERtcConstants.ConnectionState
CONNECTION_STATE_RECONNECTING	com.netease.lava.nertc.sdk.NERtcConstants.ConnectionState
CONNECTION_STATE_UNKNOWN	com.netease.lava.nertc.sdk.NERtcConstants.ConnectionState