1# OH_CommonEvent 2 3<!--Kit: Basic Services Kit--> 4<!--Subsystem: Notification--> 5<!--Owner: @peixu--> 6<!--Designer: @dongqingran; @wulong158--> 7<!--Tester: @wanghong1997--> 8<!--Adviser: @huipeizi--> 9 10## Overview 11 12Provides the capability of subscribing to and unsubscribing from common events. 13 14**System capability**: SystemCapability.Notification.CommonEvent 15 16**Since**: 12 17 18## Files 19 20| Name| Description| 21| -- | -- | 22| [oh_commonevent.h](capi-oh-commonevent-h.md) | Defines the APIs for subscribing to and unsubscribing from common events and enumerates the error codes.| 23| [oh_commonevent_support.h](capi-oh-commonevent-support-h.md) | Provides common event constants defined by the system.| 24