Listener objects can be removed when the application is no longer interested in receiving real-time updates. A listener (or all of them) should be removed from the same event handler object which they were added to. The following listener removal APIs are available:
Removing all listeners¶
The method removes all registered listeners for the
The method below removes all listeners which process events for a specific
where clause. The value of the
whereClause argument must be the same as one in the
Removing a specific listener¶
This method removes a listener identified by a callback function:
// for the class-based approach; eventHandler.removeUpdateListener(void Function(T) callback); // for the map-based approach: eventHandler.removeUpdateListener(void Function(Map) callback);
||Unique identifier of the event listener that must be deleted.|
This operation does not return a value.
The example below registers a new update listener with the
id``"1EFD-3GEF2-FF4C-AC21" , waits for
15000 milliseconds and deletes the event listener afterwards.