addCompositeRegionListener
Adds a listener for information about the CompositeRegionGraph and the state information.
Note: The first listener that is added triggers the process of determining the CompositeRegionGraph. If the map regions cannot be determined, an error will be added in CompositeRegionListener.onCompositeRegionGraphChanged. The listener will be called when and if the error is resolved.
Parameters
listener
The listener to be added.
Throws
if the listener is already added.