@ohos.multimodalAwareness.onScreen (Onscreen Awareness) (System API)

This module provides the onscreen awareness capability.

NOTE

The initial APIs of this module are supported since API version 20. Newly added APIs will be marked with a superscript to indicate their earliest API version.

The APIs provided by this module are system APIs.

Modules to Import

import { onScreen } from '@kit.MultimodalAwarenessKit';

Scenario

Enumerates the scenarios of the onscreen content.

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

System API: This is a system API.

Name	Value	Description
UNKNOWN	0	Unknown scenario.
ARTICLE	1	Article scenario.

EventType

Enumerates the control event types.

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

System API: This is a system API.

Name	Value	Description
SCROLL_TO_HOOK	1	Scrolling to the hook.

Paragraph

Defines the paragraph information.

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

System API: This is a system API.

Name	Type	Read-Only	Optional	Description
hookId	number	No	Yes	Hook ID of the paragraph, which is the identifier of each main paragraph.
chapterId	number	No	Yes	Chapter ID of the paragraph, which is the identifier of each subchapter.
title	string	No	Yes	Title of the paragraph.
text	string	No	Yes	Content of the paragraph.

ContentOptions

Defines the options for obtaining the onscreen content.

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

System API: This is a system API.

Name	Type	Read-Only	Optional	Description
windowId	number	No	Yes	ID of the window whose content needs to be obtained. If this parameter is not set or is set to undefined, the content of the full-screen window is obtained by default.
contentUnderstand	boolean	No	Yes	Whether content understanding is required. The default value is False.
pageLink	boolean	No	Yes	Whether to obtain the page link. The default value is False.
textOnly	boolean	No	Yes	Whether to obtain only the text and divide the text into paragraphs. The default value is False.

PageContent

Defines the onscreen content.

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

System API: This is a system API.

Name	Type	Read-Only	Optional	Description
windowId	number	No	No	Window ID of the onscreen content.
sessionId	number	No	No	Session ID, which identifies the call action.
bundleName	string	No	No	Bundle name of the onscreen content.
scenario	Scenario	No	Yes	Scenario of the onscreen content. This parameter is available only when options.contentUnderstand is set to True.
title	string	No	Yes	Title of the onscreen content. This parameter is available only when options.contentUnderstand is set to True.
content	string	No	Yes	Body of the onscreen content. This parameter is available only when options.contentUnderstand is set to True.
pageLink	string	No	Yes	Page link of the onscreen content. This parameter is available only when options.pageLink is set to True.
paragraphs	Paragraph[]	No	Yes	Paragraph information of the onscreen content. This parameter is available only when options.textOnly is set to True.

ControlEvent

Defines a control event.

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

System API: This is a system API.

Name	Type	Read-Only	Optional	Description
windowId	number	No	No	ID of the window to be operated.
sessionId	number	No	No	ID of the session to be operated. The hook ID and the session ID can be obtained from PageContent of a session.
eventType	EventType	No	No	Control event type.
hookId	number	No	Yes	Hook ID corresponding to the control event. The hook ID and the session ID can be obtained from PageContent of a session.

OnscreenAwarenessCap²³⁺

Defines onscreen awareness capabilities (including but not limited to awareness in a reading scenario and OCR).

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

System API: This is a system API.

Name	Type	Read-Only	Optional	Description
capList	string[]	No	Yes	Capability list, including the capabilities for obtaining page content, page link, and text selection information. The following table describes the specific capabilities.
groupId	string	No	Yes	Service group ID. A group of capabilities preset based on service scenarios. Service scenarios can be subscribed to in a unified manner. The following table describes the specific group IDs.

Parameter restrictions:
You can use the on-screen awareness feature through capList or groupId.

Logical relationship: capList and groupId are mutually supplementary and mandatory. At least one of them must be provided and cannot be empty.
Verification rule: When the API is called, the system checks capList and groupId separately.

Capability list: Use the on-screen awareness feature by capList or groupId. The definitions are as follows.

Capabilities supported by capList

Capability	Function
Acticle	Obtains the information about awareness in a reading scenario.
ShortVideo	Obtains the information about awareness in a short video scenario.
Todo	Obtains the information about awareness in a to-do scenario.
Activity	Obtains the awareness information of basic services.
UiImage	Obtains the information about sub-images on a page.
JumpContext	Highlights and jumps to a specified context.
QuickSnap	Obtains the information about a single snapshot. Usage specifications: This capability is used only in the trigger API. It takes effect only when capList is set to QuickSnap. For other APIs, error code 401 is returned.

Capabilities supported by groupId

Capability	Sub-capability	Function
SmartEdge	Acticle	Obtains the information about awareness in a reading scenario.
SmartEdge	ShortVideo	Obtains the information about awareness in a short video scenario.
SmartEdge	Todo	Obtains the information about awareness in a to-do scenario.
SmartEdge	Activity	Obtains the awareness information of basic services.

OnscreenAwarenessOptions²³⁺

Defines the list of onscreen awareness parameters, which is used to obtain onscreen information in specific scenarios. For example, a window ID is provided to collect application UI content and links.

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

System API: This is a system API.

Name	Type	Read-Only	Optional	Description
parameters	Record<string, Object>	No	Yes	List of awareness parameters. The parameter result is a key-value data object.

CollectStrategy²³⁺

Defines a page information collection policy.

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

System API: This is a system API.

Name	Value	Description
ALLOW	1 << 0	Collection is supported.
SPLIT_SCREEN	1 << 1	Collection policy of the split-screen window on the application.
UNSUPPORTED_APP	1 << 2	Automatic collection is not supported.
PRIVATE_WINDOW	1 << 3	Privacy window of the application.
ANCO_APP	1 << 4	VM application, which is a non-HarmonyOS application.
ALLOW_USER_CHANGE	1 << 5	Collection policies can be configured.
BUSINESS_APP	1 << 6	Application data can be collected.
FLOAT_SCREEN	1 << 7	Floating window.
PIP_SCREEN	1 << 8	Picture-in-picture mode.
LAUNCHER	1 << 9	Desktop application.

AwarenessItem²³⁺

Provides page information, which includes:

Basic page information, such as page content, links, and screenshots.
Page entity information, such as the title and body of a page article.
Page interaction information, such as clicks and scrolling.

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

System API: This is a system API.

Name	Type	Read-Only	Optional	Description
itemInfo	Record<string, Object>	Yes	No	Entity information of the awareness result, including the content, links, screenshots, and other entity information.

EntityInfo²³⁺

Provides entity information perceived, including content, links, images, and other types of entities.

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

System API: This is a system API.

Name	Type	Read-Only	Optional	Description
entityName	string	Yes	No	Name of the perceived entity, which is fixed.
entityInfo	Record<string, Object>	Yes	No	Entity information of the awareness result, including the content, links, images, and other entity information.

OnscreenAwarenessInfo²³⁺

Returns the list of onscreen awareness information.

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

System API: This is a system API.

Name	Type	Read-Only	Optional	Description
resultCode	number	Yes	No	Return code. The default value 0 indicates success.
timestamp	number	Yes	No	Timestamp for accessing a specified page.
uid	string	Yes	Yes	Application UID.
bundleName	string	Yes	Yes	Application bundle name.
appName	string	Yes	Yes	Application name.
miniProgramId	string	Yes	Yes	Applet ID, for example, the ID of WeChat or Alipay.
miniProgramName	string	Yes	Yes	Name of a third-party mini program.
appIndex	number	Yes	Yes	Application index.
pageId	string	Yes	Yes	Application page ID.
sampleId	string	Yes	Yes	Collection record ID.
collectStrategy	number	Yes	Yes	Page collection policy, which is the bitwise OR operation combination of CollectStrategy.
displayId	number	Yes	Yes	Display ID.
windowId	number	Yes	Yes	Window ID.
languageInfo	string	Yes	Yes	Page language information.
pageTags	string[]	Yes	Yes	Page tag information.
items	AwarenessItem[]	Yes	Yes	Data item information.
entityInfo	EntityInfo[]	Yes	Yes	Entity information.

ReadingScreenPermissionStatus²³⁺

Returns the status of the permission for reading screen information.

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

System API: This is a system API.

Name	Type	Read-Only	Optional	Description
readingState	number	Yes	No	Whether screen reading is allowed. 0: no 1: yes
readingCode	number	Yes	Yes	If the screen information cannot be read, the corresponding status code will be returned.

onScreen.getPageContent

getPageContent(options?: ContentOptions): Promise<PageContent>

Obtains the onscreen content when a window is displayed on the screen.

Required permissions: ohos.permission.GET_SCREEN_CONTENT

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
options	ContentOptions	No	Options for obtaining the onscreen screen content. By default, the window ID is not specified, and other options are False.

Error codes

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

ID	Error Message
201	Permission denied. An attempt was made to get page content forbidden by permission: ohos.permission.GET_SCREEN_CONTENT.
202	Permission check failed. A non-system application uses the system API.
801	Capability not supported. Function can not work correctly due to limited device capabilities.
34000001	Service exception.
34000002	The application or page is not supported.
34000003	The window ID is invalid. Possible causes: 1. window id is not passed when screen is split. 2. passed window id is not on screen or floating.
34000004	The page is not ready.
34000006	The request timed out.

Example

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

let options: onScreen.ContentOptions = {
   contentUnderstand: true,
   pageLink: true
};
try {
   onScreen.getPageContent(options).then((pageContent: onScreen.PageContent) => {
      console.info("get page content succeed, bundleName = " + pageContent.bundleName);
   }).catch((err: BusinessError) => {
      console.error("get page content failed, errCode = " + err.code);
   });
} catch (err) {
   console.error('get page content failed, errCode = ' + err.code);
}

onScreen.sendControlEvent

sendControlEvent(event: ControlEvent): Promise<void>

If the target window is displayed on the screen, you can use this API to send screen control events based on the paragraph information obtained via onScreen.getPageContent.

Required permissions: ohos.permission.SIMULATE_USER_INPUT.

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
event	ControlEvent	Yes	Onscreen control event.

Error codes

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

ID	Error Message
201	Permission denied. An attempt was made to get page content forbidden by permission: ohos.permission.SIMULATE_USER_INPUT.
202	Permission check failed. A non-system application uses the system API.
801	Capability not supported. Function can not work correctly due to limited device capabilities.
34000001	Service exception.
34000005	The target is not found.

Example

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

let options: onScreen.ContentOptions = {
   contentUnderstand: true,
   textOnly: true
};
let event: onScreen.ControlEvent|undefined = undefined;
try {
   onScreen.getPageContent(options).then((pageContent: onScreen.PageContent) => {
      if (pageContent.paragraphs != undefined && pageContent.paragraphs.length > 0 &&
         pageContent.paragraphs[0].hookId != undefined) {
         event = {
            windowId: pageContent.windowId,
            sessionId: pageContent.sessionId,
            hookId: pageContent.paragraphs[0].hookId,
            eventType: onScreen.EventType.SCROLL_TO_HOOK
         };
      }
   }).catch((err: BusinessError) => {
      console.error("get page content failed, errCode = " + err.code);
   });
} catch (err) {
   console.error('invoke failed, errCode = ' + err.code);
}
if (event != undefined) {
   try {
      onScreen.sendControlEvent(event).catch((err: BusinessError) => {
         console.error("send control event failed, errCode =" + err.code);
      })
   } catch (err) {
      console.error('invoke failed, errCode = ' + err.code);
   }
}

onScreen.subscribe²³⁺

subscribe(capability: OnscreenAwarenessCap, callback: Callback<OnscreenAwarenessInfo[]>, options?: OnscreenAwarenessOptions): void

Enables proactive awareness on screen content and subscribes to a screen awareness result.

Required permissions: ohos.permission.GET_SCREEN_CONTENT

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

Device behavior differences: This API can be properly called on phones and tablets. If it is called on other devices, error code 801 is returned.

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
capability	OnscreenAwarenessCap	Yes	Onscreen awareness capability list.
options	OnscreenAwarenessOptions	No	Onscreen awareness parameter list.
callback	Callback<OnscreenAwarenessInfo[]>	Yes	Callback function, which returns the onscreen awareness result. The returned onscreen awareness information list OnscreenAwarenessInfo[] contains a maximum of two awareness information items.

Error codes

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

ID	Error Message
201	Permission denied. An attempt was made to get page content forbidden by permission: ohos.permission.GET_SCREEN_CONTENT.
202	Permission check failed. A non-system application uses the system API.
801	Capability not supported. Function can not work correctly due to limited device capabilities.
34000001	Service exception.
34000002	The application or page is not supported.

Example

import onScreen from "@ohos.multimodalAwareness.onScreen";
let onscreenAwarenessCap: onScreen.OnscreenAwarenessCap = {
   groupId: 'SmartEdge',
}

let onscreenAwarenessOptions: onScreen.OnscreenAwarenessOptions = {
   parameters: {
      "SmartEdge" : {
         "windowId":'102',
      }
   }
}
try {
   onScreen.subscribe(onscreenAwarenessCap, (info: onScreen.OnscreenAwarenessInfo[]) => {
      console.info(`subscribe resultCode: ${info[0].resultCode}`);
   }, onscreenAwarenessOptions);
} catch (err) {
   console.error('subscribe failed, errCode = ' + err.code);
}

onScreen.unsubscribe²³⁺

unsubscribe(capability: OnscreenAwarenessCap, callback?: Callback<OnscreenAwarenessInfo[]>): void

Disables proactive awareness on screen content and unsubscribes from a screen awareness result.

Required permissions: ohos.permission.GET_SCREEN_CONTENT

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

Device behavior differences: This API can be properly called on phones and tablets. If it is called on other devices, error code 801 is returned.

Parameters

Name	Type	Mandatory	Description
capability	OnscreenAwarenessCap	Yes	Onscreen awareness capability list.
callback	Callback<OnscreenAwarenessInfo>	No	Callback to unregister. If this parameter is not passed, all callbacks of the awareness capability are unregistered. The returned onscreen awareness information list OnscreenAwarenessInfo[] contains a maximum of two awareness information items.

Error codes

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

ID	Error Message
201	Permission denied. An attempt was made to get page content forbidden by permission: ohos.permission.GET_SCREEN_CONTENT.
202	Permission check failed. A non-system application uses the system API.
801	Capability not supported. Function can not work correctly due to limited device capabilities.
34000001	Service exception.

Example

import onScreen from "@ohos.multimodalAwareness.onScreen";
let onscreenAwarenessCap: onScreen.OnscreenAwarenessCap = {
   groupId: 'SmartEdge'
}

try {
  onScreen.unsubscribe(onscreenAwarenessCap, (info: onScreen.OnscreenAwarenessInfo[]) => {
    console.info(`unsubscribe resultCode: ${info[0].resultCode}`);
  });
} catch (err) {
  console.error('unsubscribe failed, errCode = ' + err.code);
}

onScreen.trigger²³⁺

trigger(capability: OnscreenAwarenessCap, options?: OnscreenAwarenessOptions): Promise<OnscreenAwarenessInfo>

Proactively triggers screen content awareness and obtains the current screen awareness result.

Required permissions: ohos.permission.GET_SCREEN_CONTENT

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

Device behavior differences: This API can be properly called on phones and tablets. If it is called on other devices, error code 801 is returned.

Parameters

Name	Type	Mandatory	Description
capability	OnscreenAwarenessCap	Yes	Onscreen awareness capability list.
options	OnscreenAwarenessOptions	No	Onscreen awareness parameter list.

Return value

Type	Description
Promise<OnscreenAwarenessInfo>	Promise used to return the onscreen awareness result.

Error codes

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

ID	Error Message
201	Permission denied. An attempt was made to get page content forbidden by permission: ohos.permission.GET_SCREEN_CONTENT.
202	Permission check failed. A non-system application uses the system API.
801	Capability not supported. Function can not work correctly due to limited device capabilities.
34000001	Service exception.
34000002	The application or page is not supported.

Example

import onScreen from "@ohos.multimodalAwareness.onScreen";
let onscreenAwarenessCap: onScreen.OnscreenAwarenessCap = {
  capList: [
    'UiImage'
  ]
}

let onscreenAwarenessOptions: onScreen.OnscreenAwarenessOptions = {
  parameters: {
    "windowId": 102
  } as Record<string, Object>
}
try {
  let info: onScreen.OnscreenAwarenessInfo =
    await onScreen.trigger(onscreenAwarenessCap, onscreenAwarenessOptions);
  console.info(`trigger resultCode: ${info.resultCode}`);
} catch (err) {
  console.error('trigger failed, errCode = ' + err.code);
}

onScreen.capture²³⁺

capture(capability: OnscreenAwarenessCap, options?: OnscreenAwarenessOptions): Promise<OnscreenAwarenessInfo[]>

Proactively triggers screen content awareness to obtain page information.

Required permissions: ohos.permission.GET_SCREEN_CONTENT

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

Device behavior differences: This API can be properly called on phones and tablets. If it is called on other devices, error code 801 is returned.

Parameters

Name	Type	Mandatory	Description
capability	OnscreenAwarenessCap	Yes	Onscreen awareness capability list. For details, see the following supported capability list.
options	OnscreenAwarenessOptions	No	Onscreen awareness parameter list.

capList capabilities supported by the capture API

capList Capability	Function
UiImage	Obtains the information about sub-images on a page.
QuickSnap	Obtains screenshot information.

Return value

Type	Description
Promise<OnscreenAwarenessInfo[]>	Promise used to return the onscreen awareness result. The returned onscreen awareness information list OnscreenAwarenessInfo[] contains a maximum of two awareness information items.

Error codes

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

ID	Error Message
201	Permission denied. An attempt was made to get page content forbidden by permission: ohos.permission.GET_SCREEN_CONTENT.
202	Permission check failed. A non-system application uses the system API.
801	Capability not supported. Function can not work correctly due to limited device capabilities.
34000001	Service exception.
34000002	The application or page is not supported.

Example

import onScreen from "@ohos.multimodalAwareness.onScreen";
let onscreenAwarenessCap: onScreen.OnscreenAwarenessCap = {
  capList: [
    'UiImage',
  ]
}
try {
  let info: onScreen.OnscreenAwarenessInfo[] = await onScreen.capture(onscreenAwarenessCap);
  console.error(`capture resultCode: ${info[0].resultCode}`);
} catch (err) {
  console.info(`capture failed, error: ${err}`);
}

onScreen.interact²³⁺

interact(capability: OnscreenAwarenessCap, options?: OnscreenAwarenessOptions): Promise<OnscreenAwarenessInfo[]>

Proactively triggers screen behavior interaction to identify screen behaviors and return behavior receipts. For example, after a link is clicked, the system accurately jumps to the specified paragraph and highlights the text based on the receipt information.

Required permissions: ohos.permission.GET_SCREEN_CONTENT

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

Device behavior differences: This API can be properly called on phones and tablets. If it is called on other devices, error code 801 is returned.

Parameters

Name	Type	Mandatory	Description
capability	OnscreenAwarenessCap	Yes	Onscreen awareness capability list. For details, see the following supported capability list.
options	OnscreenAwarenessOptions	No	Onscreen awareness parameter list.

capList capabilities supported by the interact API

capList Capability	Function
JumpContext	Highlights and jumps to a specified context.

Return value

Type	Description
Promise<OnscreenAwarenessInfo[]>	Promise used to return the onscreen awareness result. The returned onscreen awareness information list OnscreenAwarenessInfo[] contains a maximum of two awareness information items.

Error codes

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

ID	Error Message
201	Permission denied. An attempt was made to get page content forbidden by permission: ohos.permission.GET_SCREEN_CONTENT.
202	Permission check failed. A non-system application uses the system API.
801	Capability not supported. Function can not work correctly due to limited device capabilities.
34000001	Service exception.
34000002	The application or page is not supported.

Example

import onScreen from "@ohos.multimodalAwareness.onScreen";
let onscreenAwarenessCap: onScreen.OnscreenAwarenessCap = {
  capList: [
    'JumpContext',
  ]
}

let onscreenAwarenessOptions: onScreen.OnscreenAwarenessOptions = {
  parameters: {
    "JumpContext" : {
      "pageId":'156',
      "textCompIdList": ['235'],
      "text": 'Article beginning'
    }
  }
}

try {
  let info: onScreen.OnscreenAwarenessInfo[] = await onScreen.interact(onscreenAwarenessCap, onscreenAwarenessOptions);
  console.error(`interact resultCode: ${info[0].resultCode}`);
} catch (err) {
  console.info(`interact failed, error: ${err}`);
}

onScreen.apperceive²³⁺

apperceive(capability: OnscreenAwarenessCap, options?: OnscreenAwarenessOptions): Promise<OnscreenAwarenessInfo[]>

Proactively triggers screen content awareness to obtain the screen content for snapshot analysis.

Required permissions: ohos.permission.GET_SCREEN_CONTENT

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

Device behavior differences: This API can be properly called on phones and tablets. If it is called on other devices, error code 801 is returned.

Parameters

Name	Type	Mandatory	Description
capability	OnscreenAwarenessCap	Yes	Onscreen awareness capability list. For details, see the following supported capability list.
options	OnscreenAwarenessOptions	No	Onscreen awareness parameter list.

groupId capabilities supported by the apperceive API

groupId Capability	Sub-capability	Function
SmartEdge	Acticle	Obtains the information about awareness in a reading scenario.
SmartEdge	ShortVideo	Obtains the information about awareness in a short video scenario.
SmartEdge	Todo	Obtains the information about awareness in a to-do scenario.
SmartEdge	Activity	Obtains the awareness information of basic services.

Return value

Type	Description
Promise<OnscreenAwarenessInfo[]>	Promise used to return the onscreen awareness result. The returned onscreen awareness information list OnscreenAwarenessInfo[] contains a maximum of two awareness information items.

Error codes

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

ID	Error Message
201	Permission denied. An attempt was made to get page content forbidden by permission: ohos.permission.GET_SCREEN_CONTENT.
202	Permission check failed. A non-system application uses the system API.
801	Capability not supported. Function can not work correctly due to limited device capabilities.
34000001	Service exception.
34000002	The application or page is not supported.

Example

import onScreen from "@ohos.multimodalAwareness.onScreen";
let onscreenAwarenessCap: onScreen.OnscreenAwarenessCap = {
  groupId: 'SmartEdge'
}
try {
  let info: onScreen.OnscreenAwarenessInfo[] = await onScreen.apperceive(onscreenAwarenessCap);
  console.error(`apperceive resultCode: ${info[0].resultCode}`);
} catch (err) {
  console.info(`apperceive failed, error: ${err}`);
}

onScreen.onReadingScreenPermissionListener²³⁺

onReadingScreenPermissionListener(callback: Callback<ReadingScreenPermissionStatus>): void

Enables the screen content access permission monitoring and returns the permission status in real time.

Required permissions: ohos.permission.GET_SCREEN_CONTENT

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

Device behavior differences: This API can be properly called on phones and tablets. If it is called on other devices, error code 801 is returned.

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
callback	Callback<ReadingScreenPermissionStatus>	Yes	Callback used to return the status of the permission for reading screen information.

Error codes

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

ID	Error Message
201	Permission denied. An attempt was made to get page content forbidden by permission: ohos.permission.GET_SCREEN_CONTENT.
202	Permission check failed. A non-system application uses the system API.
801	Capability not supported. Function can not work correctly due to limited device capabilities.
34000001	Service exception.

Example

import onScreen from "@ohos.multimodalAwareness.onScreen";
try {
   onScreen.onReadingScreenPermissionListener((info: onScreen.ReadingScreenPermissionStatus) => {
      console.info(`onReadingScreenPermissionListener succeeded, readingState: ${info.readingState}`);
   });
} catch (err) {
   console.error('onReadingScreenPermissionListener failed, errCode = ' + err.code);
}

onScreen.offReadingScreenPermissionListener²³⁺

offReadingScreenPermissionListener(callback?: Callback<ReadingScreenPermissionStatus>): void

Disables the screen content access permission monitoring.

Required permissions: ohos.permission.GET_SCREEN_CONTENT

System capability: SystemCapability.MultimodalAwareness.OnScreenAwareness

Device behavior differences: This API can be properly called on phones and tablets. If it is called on other devices, error code 801 is returned.

Parameters

Name	Type	Mandatory	Description
callback	Callback<ReadingScreenPermissionStatus>	No	Callback to unregister. If this parameter is not passed, all callbacks of the event are unregistered.

Error codes

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

ID	Error Message
201	Permission denied. An attempt was made to get page content forbidden by permission: ohos.permission.GET_SCREEN_CONTENT.
202	Permission check failed. A non-system application uses the system API.
801	Capability not supported. Function can not work correctly due to limited device capabilities.
34000001	Service exception.

Example

import onScreen from "@ohos.multimodalAwareness.onScreen";
try {
  onScreen.offReadingScreenPermissionListener();
  console.info(`offReadingScreenPermissionListener succeeded.`);
} catch (err) {
  console.error('offReadingScreenPermissionListener failed, errCode = ' + err.code);
}

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openharmony 鸿蒙 Readme-EN

openharmony 鸿蒙 errorcode-userStatus

openharmony 鸿蒙 errorcode-deviceStatus

openharmony 鸿蒙 js-apis-stationary

openharmony 鸿蒙 js-apis-awareness-onScreen-sys

@ohos.multimodalAwareness.onScreen (Onscreen Awareness) (System API)

Modules to Import

Scenario

EventType

Paragraph

ContentOptions

PageContent

ControlEvent

OnscreenAwarenessCap²³⁺

OnscreenAwarenessOptions²³⁺

CollectStrategy²³⁺

AwarenessItem²³⁺

EntityInfo²³⁺

OnscreenAwarenessInfo²³⁺

ReadingScreenPermissionStatus²³⁺

onScreen.getPageContent

onScreen.sendControlEvent

onScreen.subscribe²³⁺

onScreen.unsubscribe²³⁺

onScreen.trigger²³⁺

onScreen.capture²³⁺

onScreen.interact²³⁺

onScreen.apperceive²³⁺

onScreen.onReadingScreenPermissionListener²³⁺

onScreen.offReadingScreenPermissionListener²³⁺

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@ohos.multimodalAwareness.onScreen (Onscreen Awareness) (System API)

Modules to Import

Scenario

EventType

Paragraph

ContentOptions

PageContent

ControlEvent

OnscreenAwarenessCap23+

OnscreenAwarenessOptions23+

CollectStrategy23+

AwarenessItem23+

EntityInfo23+

OnscreenAwarenessInfo23+

ReadingScreenPermissionStatus23+

onScreen.getPageContent

onScreen.sendControlEvent

onScreen.subscribe23+

onScreen.unsubscribe23+

onScreen.trigger23+

onScreen.capture23+

onScreen.interact23+

onScreen.apperceive23+

onScreen.onReadingScreenPermissionListener23+

onScreen.offReadingScreenPermissionListener23+

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OnscreenAwarenessCap²³⁺

OnscreenAwarenessOptions²³⁺

CollectStrategy²³⁺

AwarenessItem²³⁺

EntityInfo²³⁺

OnscreenAwarenessInfo²³⁺

ReadingScreenPermissionStatus²³⁺

onScreen.subscribe²³⁺

onScreen.unsubscribe²³⁺

onScreen.trigger²³⁺

onScreen.capture²³⁺

onScreen.interact²³⁺

onScreen.apperceive²³⁺

onScreen.onReadingScreenPermissionListener²³⁺

onScreen.offReadingScreenPermissionListener²³⁺