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MapChangeListener can be registered with a RealmMap to receive a notification with a MapChangeSet to describe the details of what have been changed in the map since last time.
Realm instances on a thread without an android.os.Looper cannot register a MapChangeListener .
This will be called when the async query is finished the first time or the collection of objects has changed.
map - the map this listener is registered to.
changes - object with information about the change.