@ohos.commonEventManager (Common Event) (System API)

This module provides common event capabilities, including publishing, subscribing to, and unsubscribing from common events.

NOTE

The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.

This topic describes only system APIs provided by the module. For details about its public APIs, see CommonEventManager.

Modules to Import

import { commonEventManager } from '@kit.BasicServicesKit';

Support

A system common event is an event that is published by a system service or system application and requires specific permissions to subscribe to. To publish or subscribe to this type of event, you must follow the event-specific definitions.

For details about the enumerations of all system common events, see System Common Events.

commonEventManager.publishAsUser

publishAsUser(event: string, userId: number, callback: AsyncCallback<void>): void

Publishes a common event to a specific user. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Notification.CommonEvent

System API: This is a system API and cannot be called by third-party applications.

Parameters

Name	Type	Mandatory	Description
event	string	Yes	Name of the common event to publish. For details, see System Common Events.
userId	number	Yes	User ID.
callback	AsyncCallback<void>	Yes	Callback used to return the result.

Error codes

For details about the error codes, see Universal Error Codes and Event Error Codes.

ID	Error Message
202	not system app.
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
1500007	Failed to send the message to the common event service.
1500008	Failed to initialize the common event service.
1500009	Failed to obtain system parameters.

Example

import { BusinessError } from '@kit.BasicServicesKit';

// Specify the user to whom the common event will be published.
let userId = 100;

// Publish a common event.
try {
    commonEventManager.publishAsUser('event', userId, (err: BusinessError) => {
      if (err) {
        console.error(`publishAsUser failed, code is ${err.code}, message is ${err.message}`);
        return;
      }
      console.info('publishAsUser');
    });
} catch (error) {
    let err: BusinessError = error as BusinessError;
    console.error(`publishAsUser failed, code is ${err.code}, message is ${err.message}`);
}

commonEventManager.publishAsUser

publishAsUser(event: string, userId: number, options: CommonEventPublishData, callback: AsyncCallback<void>): void

Publishes a common event with given attributes to a specific user. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Notification.CommonEvent

System API: This is a system API and cannot be called by third-party applications.

Parameters

Name	Type	Mandatory	Description
event	string	Yes	Name of the common event to publish. For details, see System Common Events.
userId	number	Yes	User ID.
options	CommonEventPublishData	Yes	Attributes of the common event to publish.
callback	AsyncCallback<void>	Yes	Callback used to return the result.

Error codes

For details about the error codes, see Universal Error Codes and Event Error Codes.

ID	Error Message
202	not system app.
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
1500007	Failed to send the message to the common event service.
1500008	Failed to initialize the common event service.
1500009	Failed to obtain system parameters.

Example

import { BusinessError } from '@kit.BasicServicesKit';

// Attributes of a common event.
let options:commonEventManager.CommonEventPublishData = {
  code: 0,			 // Result code of the common event.
  data: 'initial data', // Initial data of the common event.
}

// Specify the user to whom the common event will be published.
let userId = 100;
// Publish a common event.
try {
  commonEventManager.publishAsUser('event', userId, options, (err: BusinessError) => {
    if (err) {
      console.error(`publishAsUser failed, code is ${err.code}, message is ${err.message}`);
      return;
    }
    console.info('publishAsUser');
  });
} catch (error) {
  let err: BusinessError = error as BusinessError;
  console.error(`publishAsUser failed, code is ${err.code}, message is ${err.message}`);
}

commonEventManager.removeStickyCommonEvent¹⁰⁺

removeStickyCommonEvent(event: string, callback: AsyncCallback<void>): void

Removes a sticky common event. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Notification.CommonEvent

Required permissions: ohos.permission.COMMONEVENT_STICKY

System API: This is a system API and cannot be called by third-party applications.

Parameters

Name	Type	Mandatory	Description
event	string	Yes	Sticky common event to remove. For details, see System Common Events.
callback	AsyncCallback<void>	Yes	Callback used to return the result.

Error codes

For details about the error codes, see Universal Error Codes and Event Error Codes.

ID	Error Message
201	The application does not have permission to call the interface.
202	not system app.
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
1500004	A third-party application cannot send system common events.
1500007	Failed to send the message to the common event service.
1500008	Failed to initialize the common event service.

Example

import { BusinessError } from '@kit.BasicServicesKit';

commonEventManager.removeStickyCommonEvent('sticky_event', (err: BusinessError) => {
  if (err) {
    console.error(`removeStickyCommonEvent failed, errCode: ${err.code}, errMes: ${err.message}`);
    return;
  }
  console.info(`removeStickyCommonEvent success`);
});

commonEventManager.removeStickyCommonEvent¹⁰⁺

removeStickyCommonEvent(event: string): Promise<void>

Removes a sticky common event. This API uses a promise to return the result.

System capability: SystemCapability.Notification.CommonEvent

Required permissions: ohos.permission.COMMONEVENT_STICKY

System API: This is a system API and cannot be called by third-party applications.

Parameters

Name	Type	Mandatory	Description
event	string	Yes	Sticky common event to remove. For details, see System Common Events.

Return value

Type	Description
Promise<void>	Promise used to return the result.

Error codes

For details about the error codes, see Universal Error Codes and Event Error Codes.

ID	Error Message
201	The application does not have permission to call the interface.
202	not system app.
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
1500004	A third-party application cannot send system common events.
1500007	Failed to send the message to the common event service.
1500008	Failed to initialize the common event service.

Example

import { BusinessError } from '@kit.BasicServicesKit';

commonEventManager.removeStickyCommonEvent('sticky_event').then(() => {
  console.info(`removeStickyCommonEvent success`);
}).catch ((err: BusinessError) => {
  console.error(`removeStickyCommonEvent failed, errCode: ${err.code}, errMes: ${err.message}`);
});

commonEventManager.setStaticSubscriberState¹⁰⁺

setStaticSubscriberState(enable: boolean, callback: AsyncCallback<void>): void

Enables or disables static subscription for the current application. This API uses an asynchronous callback to return the result.

Model restriction: This API can be used only in the stage model.

System capability: SystemCapability.Notification.CommonEvent

System API: This is a system API and cannot be called by third-party applications.

Parameters

Name	Type	Mandatory	Description
enable	boolean	Yes	Whether static subscription is enabled. true: enabled. false: disabled.
callback	AsyncCallback<void>	Yes	Callback used to return the result.

Error codes

For details about the error codes, see Universal Error Codes and Event Error Codes.

ID	Error Message
202	not system app.
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
1500007	Failed to send the message to the common event service.
1500008	Failed to initialize the common event service.

Example

import { BusinessError } from '@kit.BasicServicesKit';

commonEventManager.setStaticSubscriberState(true, (err: BusinessError) => {
  if (err.code != 0) {
    console.error(`setStaticSubscriberState failed, errCode: ${err.code}, errMes: ${err.message}`);
    return;
  }
  console.info(`setStaticSubscriberState success`);
});

commonEventManager.setStaticSubscriberState¹⁰⁺

setStaticSubscriberState(enable: boolean): Promise<void>

Enables or disables static subscription for the current application. This API uses a promise to return the result.

Model restriction: This API can be used only in the stage model.

System capability: SystemCapability.Notification.CommonEvent

System API: This is a system API and cannot be called by third-party applications.

Parameters

Name	Type	Mandatory	Description
enable	boolean	Yes	Whether static subscription is enabled. true: enabled. false: disabled.

Return value

Type	Description
Promise<void>	Promise that returns no value.

Error codes

For details about the error codes, see Universal Error Codes and Event Error Codes.

ID	Error Message
202	not system app.
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
1500007	Failed to send the message to the common event service.
1500008	Failed to initialize the common event service.

Example

import { BusinessError } from '@kit.BasicServicesKit';

commonEventManager.setStaticSubscriberState(false).then(() => {
  console.info(`setStaticSubscriberState success`);
}).catch ((err: BusinessError) => {
  console.error(`setStaticSubscriberState failed, errCode: ${err.code}, errMes: ${err.message}`);
});

commonEventManager.setStaticSubscriberState¹²⁺

setStaticSubscriberState(enable: boolean, events?: Array<string>): Promise<void>

Enables or disables the static subscription event for the current application and records the event name. This API uses a promise to return the result.

Model restriction: This API can be used only in the stage model.

System capability: SystemCapability.Notification.CommonEvent

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
enable	boolean	Yes	Whether static subscription is enabled. true: enabled. false: disabled.
events	Array<string>	No	Name of a recorded event.

Return value

Type	Description
Promise<void>	Promise that returns no value.

Error codes

For details about the error codes, see Universal Error Codes and Event Error Codes.

ID	Error Message
202	not system app.
401	Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.
1500007	Failed to send the message to the common event service.
1500008	Failed to initialize the common event service.

Example

import { BusinessError } from '@kit.BasicServicesKit';

let evenName: string[] = ['usual.event.SEND_DATA'];
commonEventManager.setStaticSubscriberState(true, evenName).then(() => {
  console.info(`setStaticSubscriberState success, state is ${true}`);
}).catch((err: BusinessError) => {
  console.error(`setStaticSubscriberState failed, errCode: ${err.code}, errMes: ${err.message}`);
});

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