reference/apis-mdm-kit/js-apis-enterprise-deviceSettings-sys.md

# @ohos.enterprise.deviceSettings (Device Settings) (System API)

The **deviceSettings** module provides APIs for setting enterprise devices, including obtaining the screen-off time of a device.

> **NOTE**
>
> - The initial APIs of this module are supported since API version 10. Newly added APIs will be marked with a superscript to indicate their earliest API version.
>
> - The APIs of this module can be used only in the stage model.
>
> - The APIs of this module can be called only by a [device administrator application](../../mdm/mdm-kit-guide.md#introduction) that is [enabled](js-apis-enterprise-adminManager-sys.md#adminmanagerenableadmin-2).
>
> - This topic describes only system APIs provided by the module. For details about its public APIs, see [@ohos.enterprise.deviceSettings](js-apis-enterprise-deviceSettings.md).

## Modules to Import

```ts
import { deviceSettings } from '@kit.MDMKit';
```

## deviceSettings.setScreenOffTime<sup>11+</sup>

setScreenOffTime(admin: Want, time: number): void

Sets the device screen-off time.

**Required permissions**: ohos.permission.ENTERPRISE_SET_SCREENOFF_TIME

**System capability**: SystemCapability.Customization.EnterpriseDeviceManager

**Parameters**

| Name     | Type                                      | Mandatory  | Description                      |
| -------- | ---------------------------------------- | ---- | ------------------------------- |
| admin    | [Want](../apis-ability-kit/js-apis-app-ability-want.md)     | Yes   | EnterpriseAdminExtensionAbility.    |
| time | number            | Yes   | Screen-off time to set, in milliseconds. You are advised to set this parameter to the device's optional screen-off time.      |

**Error codes**

For details about the error codes, see [Enterprise Device Management Error Codes](errorcode-enterpriseDeviceManager.md) and [Universal Error Codes](../errorcode-universal.md).

| ID| Error Message                                                                      |
| ------- | ---------------------------------------------------------------------------- |
| 9200001 | The application is not an administrator application of the device.            |
| 9200002 | The administrator application does not have permission to manage the device. |
| 201 | Permission verification failed. The application does not have the permission required to call the API. |
| 202 | Permission verification failed. A non-system application calls a system API. |
| 401 | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed. |

**Example**

```ts
import { Want } from '@kit.AbilityKit';

let wantTemp: Want = {
  bundleName: 'com.example.myapplication',
  abilityName: 'EntryAbility',
};
try {
  deviceSettings.setScreenOffTime(wantTemp, 30000);
  console.info(`Succeeded in setting screen off time`);
} catch(err) {
  console.error(`Failed to set screen off time. Code: ${err.code}, message: ${err.message}`);
}
```

## deviceSettings.getScreenOffTime

getScreenOffTime(admin: Want, callback: AsyncCallback&lt;number&gt;): void

Obtains the device screen-off time. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.ENTERPRISE_GET_SETTINGS

**System capability**: SystemCapability.Customization.EnterpriseDeviceManager

**Parameters**

| Name     | Type                                      | Mandatory  | Description                      |
| -------- | ---------------------------------------- | ---- | ------------------------------- |
| admin    | [Want](../apis-ability-kit/js-apis-app-ability-want.md)     | Yes   | EnterpriseAdminExtensionAbility.           |
| callback | AsyncCallback&lt;number&gt;            | Yes   | Callback invoked to return the result. If the operation is successful, **err** is **null** and **data** is the screen-off time in ms. If the operation fails, **err** is an error object.      |

**Error codes**

For details about the error codes, see [Enterprise Device Management Error Codes](errorcode-enterpriseDeviceManager.md) and [Universal Error Codes](../errorcode-universal.md).

| ID| Error Message                                                                      |
| ------- | ---------------------------------------------------------------------------- |
| 9200001 | The application is not an administrator application of the device.            |
| 9200002 | The administrator application does not have permission to manage the device. |
| 201 | Permission verification failed. The application does not have the permission required to call the API. |
| 202 | Permission verification failed. A non-system application calls a system API. |
| 401 | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed. |

**Example**

```ts
import { Want } from '@kit.AbilityKit';

let wantTemp: Want = {
  bundleName: 'com.example.myapplication',
  abilityName: 'EntryAbility',
};

deviceSettings.getScreenOffTime(wantTemp, (err, result) => {
  if (err) {
    console.error(`Failed to get screen off time. Code: ${err.code}, message: ${err.message}`);
    return;
  }
  console.info(`Succeeded in getting screen off time, result : ${result}`);
});
```

## deviceSettings.getScreenOffTime

getScreenOffTime(admin: Want): Promise&lt;number&gt;

Obtains the device screen-off time. This API uses an asynchronous promise to return the result.

**Required permissions**: ohos.permission.ENTERPRISE_GET_SETTINGS

**System capability**: SystemCapability.Customization.EnterpriseDeviceManager

**Parameters**

| Name| Type                                                   | Mandatory| Description                  |
| ------ | ------------------------------------------------------- | ---- | ---------------------- |
| admin  | [Want](../apis-ability-kit/js-apis-app-ability-want.md) | Yes  | EnterpriseAdminExtensionAbility.|

**Return value**

| Type                  | Description                     |
| --------------------- | ------------------------- |
| Promise&lt;number&gt; | Promise used to return the screen-off time, in ms. |

**Error codes**

For details about the error codes, see [Enterprise Device Management Error Codes](errorcode-enterpriseDeviceManager.md) and [Universal Error Codes](../errorcode-universal.md).

| ID| Error Message                                                                    |
| ------- | ---------------------------------------------------------------------------- |
| 9200001 | The application is not an administrator application of the device.            |
| 9200002 | The administrator application does not have permission to manage the device. |
| 201 | Permission verification failed. The application does not have the permission required to call the API. |
| 202 | Permission verification failed. A non-system application calls a system API. |
| 401 | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed. |

**Example**

```ts
import { Want } from '@kit.AbilityKit';
import { BusinessError } from '@kit.BasicServicesKit';

let wantTemp: Want = {
  bundleName: 'com.example.myapplication',
  abilityName: 'EntryAbility',
};

deviceSettings.getScreenOffTime(wantTemp).then((result) => {
  console.info(`Succeeded in getting screen off time, result : ${result}`);
}).catch((err: BusinessError) => {
  console.error(`Failed to get screen off time. Code: ${err.code}, message: ${err.message}`);
});
```

## deviceSettings.installUserCertificate

installUserCertificate(admin: Want, certificate: CertBlob, callback: AsyncCallback&lt;string&gt;): void

Installs a user certificate. This API uses a callback to return the result.

**Required permissions**: ohos.permission.ENTERPRISE_MANAGE_CERTIFICATE

**System capability**: SystemCapability.Customization.EnterpriseDeviceManager

**Parameters**

| Name     | Type                                      | Mandatory  | Description                      |
| -------- | ---------------------------------------- | ---- | ------------------------------- |
| admin    | [Want](../apis-ability-kit/js-apis-app-ability-want.md)     | Yes   | EnterpriseAdminExtensionAbility.           |
| certificate    | [CertBlob](#certblob)     | Yes   | Certificate information. The certificate file must be stored in a path that can be accessed by the application, such as the application sandbox path.|
| callback | AsyncCallback&lt;string&gt;            | Yes   | Callback invoked to return the result. If the operation is successful, **err** is **null**. Otherwise, **err** is an error object.     |

**Error codes**

For details about the error codes, see [Enterprise Device Management Error Codes](errorcode-enterpriseDeviceManager.md) and [Universal Error Codes](../errorcode-universal.md).

| ID| Error Message                                                                      |
| ------- | ---------------------------------------------------------------------------- |
| 9200001 | The application is not an administrator application of the device.            |
| 9200002 | The administrator application does not have permission to manage the device. |
| 9201001 | Failed to manage the certificate. |
| 201 | Permission verification failed. The application does not have the permission required to call the API. |
| 202 | Permission verification failed. A non-system application calls a system API. |
| 401 | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed. |

**Example**

<!--code_no_check-->
```ts
import { common, Want } from '@kit.AbilityKit';
import { BusinessError } from '@kit.BasicServicesKit';

let wantTemp: Want = {
  bundleName: 'com.example.myapplication',
  abilityName: 'EntryAbility',
};
let certFileArray: Uint8Array = new Uint8Array();
// The variable context needs to be initialized in MainAbility's onCreate callback function
// test.cer needs to be placed in the rawfile directory
// Obtain the context from the component and ensure that the return value of this.getUIContext().getHostContext() is UIAbilityContext.
const context = this.getUIContext().getHostContext() as common.UIAbilityContext;
context.resourceManager.getRawFileContent("test.cer").then((value) => {
  certFileArray = value;
  deviceSettings.installUserCertificate(wantTemp, { inData: certFileArray, alias: "cert_alias_xts" }, (err, result) => {
    if (err) {
      console.error(`Failed to install user certificate. Code: ${err.code}, message: ${err.message}`);
    } else {
      console.info(`Succeeded in installing user certificate, result : ${JSON.stringify(result)}`);
    }
  });
}).catch((error: BusinessError) => {
  console.error(`Failed to get row file content. message: ${error.message}`);
  return;
});
```

## deviceSettings.installUserCertificate

installUserCertificate(admin: Want, certificate: CertBlob): Promise&lt;string&gt;

Installs a user certificate. This API uses a promise to return the result.

**Required permissions**: ohos.permission.ENTERPRISE_MANAGE_CERTIFICATE

**System capability**: SystemCapability.Customization.EnterpriseDeviceManager

**Parameters**

| Name  | Type                                 | Mandatory  | Description     |
| ----- | ----------------------------------- | ---- | ------- |
| admin | [Want](../apis-ability-kit/js-apis-app-ability-want.md) | Yes   | EnterpriseAdminExtensionAbility.|
| certificate    | [CertBlob](#certblob)     | Yes   | Certificate information. The certificate file must be stored in a path that can be accessed by the application, such as the application sandbox path.|

**Return value**

| Type                  | Description                     |
| --------------------- | ------------------------- |
| Promise&lt;string&gt; | Promise used to return the URI of the installed certificate. This URI can be used to uninstall the certificate.|

**Error codes**

For details about the error codes, see [Enterprise Device Management Error Codes](errorcode-enterpriseDeviceManager.md) and [Universal Error Codes](../errorcode-universal.md).

| ID| Error Message                                                                    |
| ------- | ---------------------------------------------------------------------------- |
| 9200001 | The application is not an administrator application of the device.            |
| 9200002 | The administrator application does not have permission to manage the device. |
| 9201001 | Failed to manage the certificate. |
| 201 | Permission verification failed. The application does not have the permission required to call the API. |
| 202 | Permission verification failed. A non-system application calls a system API. |
| 401 | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed. |

**Example**

<!--code_no_check-->
```ts
import { common, Want } from '@kit.AbilityKit';
import { BusinessError } from '@kit.BasicServicesKit';

let wantTemp: Want = {
  bundleName: 'com.example.myapplication',
  abilityName: 'EntryAbility',
};
let certFileArray: Uint8Array = new Uint8Array();
// The variable context needs to be initialized in MainAbility's onCreate callback function
// test.cer needs to be placed in the rawfile directory
// Obtain the context from the component and ensure that the return value of this.getUIContext().getHostContext() is UIAbilityContext.
const context = this.getUIContext().getHostContext() as common.UIAbilityContext;
context.resourceManager.getRawFileContent("test.cer").then((value) => {
  certFileArray = value
  deviceSettings.installUserCertificate(wantTemp, { inData: certFileArray, alias: "cert_alias_xts" })
    .then((result) => {
      console.info(`Succeeded in installing user certificate, result : ${JSON.stringify(result)}`);
    }).catch((err: BusinessError) => {
    console.error(`Failed to install user certificate. Code: ${err.code}, message: ${err.message}`);
  })
}).catch((error: BusinessError) => {
  console.error(`Failed to get row file content. message: ${error.message}`);
  return;
});
```

## CertBlob

Represents the certificate information.

**System capability**: SystemCapability.Customization.EnterpriseDeviceManager

| Name        | Type    | Read-Only| Optional| Description                           |
| ----------- | --------| ----- | ---- | ------------------------------- |
| inData | Uint8Array | No| No|Binary content of the certificate.|
| alias | string | No| No|Certificate alias.|

## deviceSettings.uninstallUserCertificate

uninstallUserCertificate(admin: Want, certUri: string, callback: AsyncCallback&lt;void&gt;): void

Uninstalls a user certificate. This API uses a callback to return the result.

**Required permissions**: ohos.permission.ENTERPRISE_MANAGE_CERTIFICATE

**System capability**: SystemCapability.Customization.EnterpriseDeviceManager

**Parameters**

| Name     | Type                                      | Mandatory  | Description                      |
| -------- | ---------------------------------------- | ---- | ------------------------------- |
| admin    | [Want](../apis-ability-kit/js-apis-app-ability-want.md)     | Yes   | EnterpriseAdminExtensionAbility.           |
| certUri    | string    | Yes   | Certificate URI, which is set and returned by the [installUserCertificate](#devicesettingsinstallusercertificate) API for installing a user certificate.|
| callback | AsyncCallback&lt;void&gt;            | Yes   | Callback invoked to return the result. If the operation is successful, **err** is **null**. Otherwise, **err** is an error object.     |

**Error codes**

For details about the error codes, see [Enterprise Device Management Error Codes](errorcode-enterpriseDeviceManager.md) and [Universal Error Codes](../errorcode-universal.md).

| ID| Error Message                                                                      |
| ------- | ---------------------------------------------------------------------------- |
| 9200001 | The application is not an administrator application of the device.            |
| 9200002 | The administrator application does not have permission to manage the device. |
| 9201001 | Failed to manage the certificate. |
| 201 | Permission verification failed. The application does not have the permission required to call the API. |
| 202 | Permission verification failed. A non-system application calls a system API. |
| 401 | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed. |

**Example**

```ts
import { Want } from '@kit.AbilityKit';

let wantTemp: Want = {
  bundleName: 'com.example.myapplication',
  abilityName: 'EntryAbility',
};
let aliasStr = "certName"
deviceSettings.uninstallUserCertificate(wantTemp, aliasStr, (err) => {
  if (err) {
    console.error(`Failed to uninstall user certificate. Code: ${err.code}, message: ${err.message}`);
    return;
  }
  console.info(`Succeeded in uninstalling user certificate`);
});
```

## deviceSettings.uninstallUserCertificate

uninstallUserCertificate(admin: Want, certUri: string): Promise&lt;void&gt;

Uninstalls a user certificate. This API uses a promise to return the result.

**Required permissions**: ohos.permission.ENTERPRISE_MANAGE_CERTIFICATE

**System capability**: SystemCapability.Customization.EnterpriseDeviceManager

**Parameters**

| Name  | Type                                 | Mandatory  | Description     |
| ----- | ----------------------------------- | ---- | ------- |
| admin | [Want](../apis-ability-kit/js-apis-app-ability-want.md) | Yes   | EnterpriseAdminExtensionAbility.|
| certUri    | string     | Yes   | Certificate URI, which is set and returned by the [installUserCertificate](#devicesettingsinstallusercertificate-1) API for installing a user certificate.|

**Return value**

| Type                  | Description                     |
| --------------------- | ------------------------- |
| Promise&lt;void&gt; | Promise that returns no value. An error object is thrown when a user certificate fails to be uninstalled.|

**Error codes**

For details about the error codes, see [Enterprise Device Management Error Codes](errorcode-enterpriseDeviceManager.md) and [Universal Error Codes](../errorcode-universal.md).

| ID| Error Message                                                                    |
| ------- | ---------------------------------------------------------------------------- |
| 9200001 | The application is not an administrator application of the device.            |
| 9200002 | The administrator application does not have permission to manage the device. |
| 9201001 | Failed to manage the certificate. |
| 201 | Permission verification failed. The application does not have the permission required to call the API. |
| 202 | Permission verification failed. A non-system application calls a system API. |
| 401 | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed. |

**Example**

```ts
import { Want } from '@kit.AbilityKit';
import { BusinessError } from '@kit.BasicServicesKit';

let wantTemp: Want = {
  bundleName: 'com.example.myapplication',
  abilityName: 'EntryAbility',
};
let aliasStr = "certName"
deviceSettings.uninstallUserCertificate(wantTemp, aliasStr).then(() => {
  console.info(`Succeeded in uninstalling user certificate`);
}).catch((err: BusinessError) => {
  console.error(`Failed to uninstall user certificate. Code is ${err.code}, message is ${err.message}`);
});
```

## deviceSettings.setPowerPolicy<sup>11+</sup>

setPowerPolicy(admin: Want, powerScene: PowerScene, powerPolicy: PowerPolicy): void

Sets the power policy.

**Required permissions**: ohos.permission.ENTERPRISE_MANAGE_SETTINGS

**System capability**: SystemCapability.Customization.EnterpriseDeviceManager

**Parameters**

| Name     | Type                                      | Mandatory  | Description                      |
| -------- | ---------------------------------------- | ---- | ------------------------------- |
| admin    | [Want](../apis-ability-kit/js-apis-app-ability-want.md)     | Yes   | EnterpriseAdminExtensionAbility.           |
| powerScene | [PowerScene](#powerscene11) | Yes   | Scenario to which the power policy applies. Currently, only the timeout scenario is supported.      |
| powerPolicy | [PowerPolicy](#powerpolicy11) | Yes   | Power policy to set.      |

**Error codes**

For details about the error codes, see [Enterprise Device Management Error Codes](errorcode-enterpriseDeviceManager.md) and [Universal Error Codes](../errorcode-universal.md).

| ID| Error Message                                                                      |
| ------- | ---------------------------------------------------------------------------- |
| 9200001 | The application is not an administrator application of the device.            |
| 9200002 | The administrator application does not have permission to manage the device. |
| 201 | Permission verification failed. The application does not have the permission required to call the API. |
| 202 | Permission verification failed. A non-system application calls a system API. |
| 401 | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed. |

**Example**

```ts
import { Want } from '@kit.AbilityKit';

let wantTemp: Want = {
  bundleName: 'com.example.myapplication',
  abilityName: 'EntryAbility',
};
try {
  let delayTime = 0;
  let powerScene: deviceSettings.PowerScene = deviceSettings.PowerScene.TIME_OUT;
  let powerPolicyAction: deviceSettings.PowerPolicyAction = deviceSettings.PowerPolicyAction.AUTO_SUSPEND;
  let powerPolicy: deviceSettings.PowerPolicy = {powerPolicyAction, delayTime};
  deviceSettings.setPowerPolicy(wantTemp, powerScene, powerPolicy);
  console.info(`Succeeded in setting power polilcy`);
} catch (err) {
  console.error(`Failed to set power policy. Code: ${err.code}, message: ${err.message}`);
}
```

## deviceSettings.getPowerPolicy<sup>11+</sup>

getPowerPolicy(admin: Want, powerScene: PowerScene): PowerPolicy

Obtains the power policy.

**Required permissions**: ohos.permission.ENTERPRISE_MANAGE_SETTINGS

**System capability**: SystemCapability.Customization.EnterpriseDeviceManager

**Parameters**

| Name     | Type                                      | Mandatory  | Description                      |
| -------- | ---------------------------------------- | ---- | ------------------------------- |
| admin    | [Want](../apis-ability-kit/js-apis-app-ability-want.md)     | Yes   | EnterpriseAdminExtensionAbility.           |
| powerScene | [PowerScene](#powerscene11) | Yes   | Scenario to which the power policy applies. Currently, only the timeout scenario is supported.      |

**Return value**

| Type  | Description                                 | Description                      |
| ----- | ----------------------------------- |------------------------------- |
| PowerPolicy | [PowerPolicy](#powerpolicy11) |   Power policy.      |

**Error codes**

For details about the error codes, see [Enterprise Device Management Error Codes](errorcode-enterpriseDeviceManager.md) and [Universal Error Codes](../errorcode-universal.md).

| ID| Error Message                                                                      |
| ------- | ---------------------------------------------------------------------------- |
| 9200001 | The application is not an administrator application of the device.            |
| 9200002 | The administrator application does not have permission to manage the device. |
| 201 | Permission verification failed. The application does not have the permission required to call the API. |
| 202 | Permission verification failed. A non-system application calls a system API. |
| 401 | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed. |

**Example**

```ts
import { Want } from '@kit.AbilityKit';

let wantTemp: Want = {
  bundleName: 'com.example.myapplication',
  abilityName: 'EntryAbility',
};
try {
  let powerScene: deviceSettings.PowerScene = deviceSettings.PowerScene.TIME_OUT;
  let powerPolicy: deviceSettings.PowerPolicy = deviceSettings.getPowerPolicy(wantTemp, powerScene);
  console.info(`Succeeded in getting power polilcy ${JSON.stringify(powerPolicy)}`);
} catch (err) {
  console.error(`Failed to get power policy. Code: ${err.code}, message: ${err.message}`);
}
```

## PowerPolicy<sup>11+</sup>

Represents the power policy.

**System capability**: SystemCapability.Customization.EnterpriseDeviceManager

| Name        | Type    | Read-Only| Optional| Description                           |
| ----------- | --------| ----- | ---- | ------------------------------- |
| powerPolicyAction | [PowerPolicyAction](#powerpolicyaction11) | No| No| Action to apply the power policy.|
| delayTime | number | No| No| Delay, in ms.|

## PowerScene<sup>11+</sup>

Defines the scenario to which the power policy applies.

**System capability**: SystemCapability.Customization.EnterpriseDeviceManager

| Name| Value| Description|
| -------- | -------- | -------- |
| TIME_OUT | 0 | Timeout scenario.|

## PowerPolicyAction<sup>11+</sup>

Enumerates the actions that can be performed to apply the power policy.

**System capability**: SystemCapability.Customization.EnterpriseDeviceManager

| Name| Value| Description|
| -------- | -------- | -------- |
| NONE | 0 | No action is performed.|
| AUTO_SUSPEND | 1 | Automatically enter the sleep mode.|
| FORCE_SUSPEND | 2 | Forcibly enter the sleep mode.|
| HIBERNATE | 3 | Enter the hibernation state. Currently, the power subsystem does not support this action.|
| SHUTDOWN | 4 | Shut down the system.|