@ohos.screenLock (Screen Lock)

The screenlock module is a system module in OpenHarmony. It provides APIs for screen lock applications to subscribe to screen lock status changes as well as callbacks for them to receive the results. It also provides APIs for third-party applications to unlock the screen, obtain the screen locked status, and check whether a lock screen password has been set.

NOTE

The initial APIs of this module are supported since API version 7. Newly added APIs will be marked with a superscript to indicate their earliest API version.

Modules to Import

import screenLock from '@ohos.screenLock';

EventType⁹⁺

Defines the system event type.

System capability: SystemCapability.MiscServices.ScreenLock

System API: This is a system API.

SystemEvent⁹⁺

Defines the structure of the system event callback.

System capability: SystemCapability.MiscServices.ScreenLock

System API: This is a system API.

screenLock.isLocked⁹⁺

isLocked(): boolean

Checks whether the screen is locked.

System capability: SystemCapability.MiscServices.ScreenLock

System API: This is a system API.

Return value

Example

let isLocked = screenLock.isLocked();

screenLock.unlock⁹⁺

unlock(callback: AsyncCallback<boolean>): void

Unlocks the screen. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.MiscServices.ScreenLock

System API: This is a system API.

Parameters

Error codes

For details about the error codes, see Screen Lock Management Error Codes.

Example

  import { BusinessError } from '@ohos.base';

  screenLock.unlock((err: BusinessError, data: Boolean) => {
    if (err) {
      console.error(`Failed to unlock the screen, Code: ${err.code}, message: ${err.message}`);
      return;
    }
    console.info(`Succeeded in unlocking the screen. result: ${data}`);
  });

screenLock.unlock⁹⁺

unlock(): Promise<boolean>

Unlocks the screen. This API uses a promise to return the result.

System capability: SystemCapability.MiscServices.ScreenLock

System API: This is a system API.

Return value

Error codes

For details about the error codes, see Screen Lock Management Error Codes.

Example

  import { BusinessError } from '@ohos.base';

  screenLock.unlock().then((data: Boolean) => {
    console.info(`Succeeded in unlocking the screen. result: ${data}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to unlock the screen, Code: ${err.code}, message: ${err.message}`);
  });

screenLock.lock⁹⁺

lock(callback: AsyncCallback<boolean>): void

Locks the screen. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.MiscServices.ScreenLock

Required permissions: ohos.permission.ACCESS_SCREEN_LOCK_INNER

System API: This is a system API.

Parameters

Error codes

For details about the error codes, see Screen Lock Management Error Codes.

Example

  import { BusinessError } from '@ohos.base';

  screenLock.lock((err: BusinessError, data: Boolean) => {
    if (err) {
      console.error(`Failed to lock the screen, Code: ${err.code}, message: ${err.message}`);
      return;
    }
    console.info(`Succeeded in locking the screen. result: ${data}`);
  });

screenLock.lock⁹⁺

lock(): Promise<boolean>

Locks the screen. This API uses a promise to return the result.

System capability: SystemCapability.MiscServices.ScreenLock

Required permissions: ohos.permission.ACCESS_SCREEN_LOCK_INNER

System API: This is a system API.

Return value

Error codes

For details about the error codes, see Screen Lock Management Error Codes.

Example

  import { BusinessError } from '@ohos.base';

  screenLock.lock().then((data: Boolean) => {
    console.info(`Succeeded in locking the screen. result: ${data}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to lock the screen, Code: ${err.code}, message: ${err.message}`);
  });

screenLock.onSystemEvent⁹⁺

onSystemEvent(callback: Callback<SystemEvent>): boolean

Registers a callback for system events related to screen locking. This API can be called only by screen lock applications.

System capability: SystemCapability.MiscServices.ScreenLock

Required permissions: ohos.permission.ACCESS_SCREEN_LOCK_INNER

System API: This is a system API.

Parameters

Return value

Error codes

For details about the error codes, see Screen Lock Management Error Codes.

Example

  try {
    let isSuccess = screenLock.onSystemEvent((event: screenLock.SystemEvent) => {
      console.log(`Succeeded in Registering the system event which related to screenlock. eventType: ${event.eventType}`)
    });
  } catch (err) {
    let error = err as BusinessError;
    console.error(`Failed to register the system event which related to screenlock, Code: ${error.code}, message: ${error.message}`)
  }

screenLock.sendScreenLockEvent⁹⁺

sendScreenLockEvent(event: String, parameter: number, callback: AsyncCallback<boolean>): void

Sends an event to the screen lock service. This API can be called only by screen lock applications. It uses an asynchronous callback to return the result.

System capability: SystemCapability.MiscServices.ScreenLock

Required permissions: ohos.permission.ACCESS_SCREEN_LOCK_INNER

System API: This is a system API.

Parameters

Error codes

For details about the error codes, see Screen Lock Management Error Codes.

Example

  import { BusinessError } from '@ohos.base';

  screenLock.sendScreenLockEvent('unlockScreenResult', 0, (err: BusinessError, result: Boolean) => {
    if (err) {
      console.error(`Failed to send screenlock event, Code: ${err.code}, message: ${err.message}`);
      return;
    }
    console.info(`Succeeded in Sending screenlock event. result: ${result}`);
  });

screenLock.sendScreenLockEvent⁹⁺

sendScreenLockEvent(event: String, parameter: number): Promise<boolean>

Sends an event to the screen lock service. This API can be called only by screen lock applications. It uses a promise to return the result.

System capability: SystemCapability.MiscServices.ScreenLock

Required permissions: ohos.permission.ACCESS_SCREEN_LOCK_INNER

System API: This is a system API.

Parameters

Return value

Error codes

For details about the error codes, see Screen Lock Management Error Codes.

Example

  import { BusinessError } from '@ohos.base';

  screenLock.sendScreenLockEvent('unlockScreenResult', 0).then((result: Boolean) => {
    console.info(`Succeeded in Sending screenlock event. result: ${result}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to send screenlock event, Code: ${err.code}, message: ${err.message}`);
  });

screenLock.isScreenLocked^(deprecated)

isScreenLocked(callback: AsyncCallback<boolean>): void

Checks whether the screen is locked. This API uses an asynchronous callback to return the result.

NOTE

This API is supported since API version 7 and deprecated since API version 9.

System capability: SystemCapability.MiscServices.ScreenLock

Parameters

Example

  import { BusinessError } from '@ohos.base';

  screenLock.isScreenLocked((err: BusinessError, data: Boolean)=>{      
    if (err) {
      console.error(`Failed to obtain whether the screen is locked, Code: ${err.code}, message: ${err.message}`);
      return;    
    }
    console.info(`Succeeded in Obtaining whether the screen is locked. result: ${data}`);
  });

screenLock.isScreenLocked^(deprecated)

isScreenLocked(): Promise<boolean>

Checks whether the screen is locked. This API uses a promise to return the result.

NOTE

This API is supported since API version 7 and deprecated since API version 9.

System capability: SystemCapability.MiscServices.ScreenLock

Return value

Example

  import { BusinessError } from '@ohos.base';

  screenLock.isScreenLocked().then((data: Boolean) => {
    console.info(`Succeeded in Obtaining whether the screen is locked. result: ${data}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to obtain whether the screen is locked, Code: ${err.code}, message: ${err.message}`);
  });

screenLock.isSecureMode^(deprecated)

isSecureMode(callback: AsyncCallback<boolean>): void

Checks whether the device is in secure mode. When the device is in secure mode, its screen requires a password, unlock pattern, or other user credentials to unlock. This API uses an asynchronous callback to return the result.

NOTE

This API is supported since API version 7 and deprecated since API version 9.

System capability: SystemCapability.MiscServices.ScreenLock

Parameters

Example

  import { BusinessError } from '@ohos.base';

  screenLock.isSecureMode((err: BusinessError, data: Boolean)=>{
    if (err) {
      console.error(`Failed to obtain whether the device is in secure mode, Code: ${err.code}, message: ${err.message}`);
      return;
    }
    console.info(`Succeeded in Obtaining whether the device is in secure mode. result: ${data}`);
  });

screenLock.isSecureMode^(deprecated)

isSecureMode(): Promise<boolean>

Checks whether the device is in secure mode. When the device is in secure mode, its screen requires a password, unlock pattern, or other user credentials to unlock. This API uses a promise to return the result.

NOTE

This API is supported since API version 7 and deprecated since API version 9.

System capability: SystemCapability.MiscServices.ScreenLock

Return value

Example

  import { BusinessError } from '@ohos.base';

  screenLock.isSecureMode().then((data: Boolean) => {
    console.info(`Succeeded in Obtaining whether the device is in secure mode. result: ${data}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to obtain whether the device is in secure mode, Code: ${err.code}, message: ${err.message}`);
  });

screenLock.unlockScreen^(deprecated)

unlockScreen(callback: AsyncCallback<void>): void

Unlocks the screen. This API uses an asynchronous callback to return the result.

NOTE

This API is supported since API version 7 and deprecated since API version 9.

System capability: SystemCapability.MiscServices.ScreenLock

Parameters

Example

  import { BusinessError } from '@ohos.base';

  screenLock.unlockScreen((err: BusinessError) => {      
    if (err) {
      console.error(`Failed to unlock the screen, Code: ${err.code}, message: ${err.message}`);
      return;    
    }
    console.info(`Succeeded unlocking the screen.`);
  });

screenLock.unlockScreen^(deprecated)

unlockScreen(): Promise<void>

Unlocks the screen. This API uses a promise to return the result.

NOTE

This API is supported since API version 7 and deprecated since API version 9.

System capability: SystemCapability.MiscServices.ScreenLock

Return value

Example

  import { BusinessError } from '@ohos.base';

  screenLock.unlockScreen().then(() => {
    console.info('Succeeded unlocking the screen.');
  }).catch((err: BusinessError) => {
    console.error(`Failed to unlock the screen, Code: ${err.code}, message: ${err.message}`);
  });

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