harmony 鸿蒙@ohos.resourceschedule.deviceStandby (Device Standby)

  • 2023-10-30
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@ohos.resourceschedule.deviceStandby (Device Standby)

A device enters standby mode if it is unused for a long period of time or after the Power button is pressed. The standby mode prolongs the battery life without affecting the use of applications. The deviceStandby module provides APIs for you to check whether a device is in standby mode and request or cancel standby resource control for an application.

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.

Modules to Import

import deviceStandby from '@ohos.resourceschedule.deviceStandby';

deviceStandby.getExemptedApps

getExemptedApps(resourceTypes: number, callback: AsyncCallback): void;

Obtains the list of applications that can still use resources of the specified types when the device is in standby mode. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.ResourceSchedule.DeviceStandby

Required permissions: ohos.permission.DEVICE_STANDBY_EXEMPTION

System API: This is a system API.

Parameters

Name Type Mandatory Description
ResourceTypes number Yes Types of resources that can be used.
callback AsyncCallback Yes Callback used to return the exempted application information.

Error codes

For details about the error codes, see Background Task Management Error Codes.

ID Error Message
9800001 Memory operation failed.
9800002 Parcel operation failed.
9800003 Inner transact failed.
9800004 System service operation failed.
18700001 Caller information verification failed.

Example

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

let resourceTypes: deviceStandby.ResourceType  = deviceStandby.ResourceType.TIMER;
deviceStandby.getExemptedApps(resourceTypes, (err: BusinessError, res: Array<deviceStandby.ExemptedAppInfo>) => {
  if (err) {
    console.log('DEVICE_STANDBY getExemptedApps callback failed. code is: ' + err.code + ',message is: ' + err.message);
  } else {
    console.log('DEVICE_STANDBY getExemptedApps callback success.');
    for (let i = 0; i < res.length; i++) {
      console.log('DEVICE_STANDBY getExemptedApps callback result ' + JSON.stringify(res[i]));
    }
  }
});

deviceStandby.getExemptedApps

getExemptedApps(resourceTypes: number): Promise;

Obtains the list of applications that can still use resources of the specified types when the device is in standby mode. This API uses a promise to return the result.

System capability: SystemCapability.ResourceSchedule.DeviceStandby

Required permissions: ohos.permission.DEVICE_STANDBY_EXEMPTION

System API: This is a system API.

Parameters

Name Type Mandatory Description
ResourceTypes number Yes Types of resources that can be used.

Return value

Type Description
Promise Promise used to return the exempted application information.

Error codes

For details about the error codes, see Background Task Management Error Codes.

ID Error Message
9800001 Memory operation failed.
9800002 Parcel operation failed.
9800003 Inner transact failed.
9800004 System service operation failed.
18700001 Caller information verification failed.

Example

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

let resourceTypes: deviceStandby.ResourceType = deviceStandby.ResourceType.TIMER;
deviceStandby.getExemptedApps(resourceTypes).then( (res: Array<deviceStandby.ExemptedAppInfo>) => {
  console.log('DEVICE_STANDBY getExemptedApps promise success.');
  for (let i = 0; i < res.length; i++) {
    console.log('DEVICE_STANDBY getExemptedApps promise result ' + JSON.stringify(res[i]));
  }
}).catch( (err: BusinessError) => {
  console.log('DEVICE_STANDBY getExemptedApps promise failed. code is: ' + err.code + ',message is: ' + err.message);
});

deviceStandby.requestExemptionResource

requestExemptionResource(request: ResourceRequest): void;

Requests exemption, so that the application can use restricted resources when the device is in standby mode.

System capability: SystemCapability.ResourceSchedule.DeviceStandby

Required permissions: ohos.permission.DEVICE_STANDBY_EXEMPTION

System API: This is a system API.

Parameters

Name Type Mandatory Description
request ResourceRequest Yes Request body.

Error codes

For details about the error codes, see Background Task Management Error Codes.

ID Error Message
9800001 Memory operation failed.
9800002 Parcel operation failed.
9800003 Inner transact failed.
9800004 System service operation failed.
18700001 Caller information verification failed.

Example

let resRequest: deviceStandby.ResourceRequest = {
  resourceTypes: deviceStandby.ResourceType.TIMER,
  uid:10003,
  name:"com.example.app",
  duration:10,
  reason:"apply",
};
deviceStandby.requestExemptionResource(resRequest);

deviceStandby.releaseExemptionResource

releaseExemptionResource(request: ResourceRequest): void;

Cancels exemption for the application.

System capability: SystemCapability.ResourceSchedule.DeviceStandby

Required permissions: ohos.permission.DEVICE_STANDBY_EXEMPTION

System API: This is a system API.

Parameters

Name Type Mandatory Description
request ResourceRequest Yes Request body.

Error codes

For details about the error codes, see Background Task Management Error Codes.

ID Error Message
9800001 Memory operation failed.
9800002 Parcel operation failed.
9800003 Inner transact failed.
9800004 System service operation failed.
18700001 Caller information verification failed.

Example

let resRequest: deviceStandby.ResourceRequest = {
  resourceTypes: deviceStandby.ResourceType.TIMER,
  uid:10003,
  name:"com.demo.app",
  duration:10,
  reason:"unapply",
};
deviceStandby.releaseExemptionResource(resRequest);

ResourceType

Enumerates the types of resources that can be used by exempted applications.

System capability: SystemCapability.ResourceSchedule.DeviceStandby

System API: This is a system API.

Name Value Description
NETWORK 1 Network access resource.
RUNNING_LOCK 2 CPU running lock resource.
TIMER 4 Timer task resource.
WORK_SCHEDULER 8 Work task resource.
AUTO_SYNC 16 Automatic synchronization resource.
PUSH 32 Push kit resource.
FREEZE 64 Freezing application resource.

ExemptedAppInfo

Defines the information about an exempted application.

System capability: SystemCapability.ResourceSchedule.DeviceStandby

System API: This is a system API.

Name Type Mandatory Description
resourceTypes number Yes Types of resources that can be used.
name string Yes Name of the application.
duration number Yes Exemption duration.

ResourceRequest

Defines the message used to request to be an exempted application.

System capability: SystemCapability.ResourceSchedule.DeviceStandby

System API: This is a system API.

Name Type Mandatory Description
resourceTypes number Yes Types of resources that can be used.
uid number Yes UID of the application.
name string Yes Name of the application.
duration number Yes Exemption duration.
reason string Yes Reason for the request.

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