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

CLOSED	com.netease.lava.nertc.sdk.NERtcConstants.VideoDeviceState
DISCONNECTED	com.netease.lava.nertc.sdk.NERtcConstants.VideoDeviceState
FREEZED	com.netease.lava.nertc.sdk.NERtcConstants.VideoDeviceState
OPENED	com.netease.lava.nertc.sdk.NERtcConstants.VideoDeviceState
UNKNOWNERROR	com.netease.lava.nertc.sdk.NERtcConstants.VideoDeviceState