void onExpirationUpdate(ExoMediaDrm mediaDrm, byte sessionId, long expirationTimeMs)Called when a session expiration update occurs, to inform the app about the change in expiration time.
ExoMediaDrmobject on which the event occurred.
sessionId- The DRM session ID on which the event occurred
expirationTimeMs- The new expiration time for the keys in the session. The time is in milliseconds, relative to the Unix epoch. A time of 0 indicates that the keys never expire.