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Broadcast sent when the device's UI has switched to car mode, either by being placed in a car dock or explicit action of the user. After sending the broadcast, the system will start the intent Android.Content.Intent.ActionMain with category Android.Content.Intent.CategoryCarDock to display the car UI, which typically what an application would implement to provide their own interface. However, applications can also monitor this Intent in order to be informed of mode changes or prevent the normal car UI from being displayed by setting the result of the broadcast to Activity.RESULT_CANCELED.