Removing Assets (ArkTS)

Available APIs

You can use remove(query: AssetMap) (asynchronous API) or removeSync(query: AssetMap) (synchronous API) to remove an asset.

The following table describes the attributes of AssetMap for removing an asset.

In the following table, the attributes ALIAS and those containing DATA_LABEL are custom asset attributes reserved for services. These attributes are not encrypted. Therefore, do not put sensitive personal data in these attributes.

Attribute Name (Tag)	Value	Mandatory	Description
ALIAS	Type: Uint8Array Length: 1-256 bytes	No	Asset alias, which uniquely identifies an asset.
ACCESSIBILITY	Type: number Value range: see Accessibility	No	Access control based on the lock screen status.
REQUIRE_PASSWORD_SET	Type: Boolean	No	Whether the asset is accessible only when a lock screen password is set. The value true means to delete the asset accessible only when a lock screen password is set. The value false means to delete the asset that can be accessed regardless of whether a lock screen password is set.
AUTH_TYPE	Type: number Value range: see AuthType	No	Type of user authentication required for accessing the asset.
SYNC_TYPE	Type: number Value range: see SyncType	No	Type of sync supported by the asset.
IS_PERSISTENT	Type: Boolean	No	Whether to retain the asset when the application is uninstalled. The value true means to retain the asset even after the application is uninstalled. The value false means the opposite.
DATA_LABEL_CRITICAL_1	Type: Uint8Array, length: 1-2048 bytes.	Optional	Key Asset attached information, content customized by the service and with integrity protection. Note: In API version 12 and earlier versions, the length is 1-512 bytes.
DATA_LABEL_CRITICAL_2	Type: Uint8Array, length: 1-2048 bytes.	Optional	Key Asset attached information, content customized by the service and with integrity protection. Note: In API version 12 and earlier versions, the length is 1-512 bytes.
DATA_LABEL_CRITICAL_3	Type: Uint8Array, length: 1-2048 bytes.	Optional	Key Asset attached information, content customized by the service and with integrity protection. Note: In API version 12 and earlier versions, the length is 1-512 bytes.
DATA_LABEL_CRITICAL_4	Type: Uint8Array, length: 1-2048 bytes.	Optional	Key Asset attached information, content customized by the service and with integrity protection. Note: In API version 12 and earlier versions, the length is 1-512 bytes.
DATA_LABEL_NORMAL_1	Type: Uint8Array, length: 1-2048 bytes.	Optional	Key Asset attached information, content customized by the service and without integrity protection. Note: In API version 12 and earlier versions, the length is 1-512 bytes.
DATA_LABEL_NORMAL_2	Type: Uint8Array, length: 1-2048 bytes.	Optional	Key Asset attached information, content customized by the service and without integrity protection. Note: In API version 12 and earlier versions, the length is 1-512 bytes.
DATA_LABEL_NORMAL_3	Type: Uint8Array, length: 1-2048 bytes.	Optional	Key Asset attached information, content customized by the service and without integrity protection. Note: In API version 12 and earlier versions, the length is 1-512 bytes.
DATA_LABEL_NORMAL_4	Type: Uint8Array, length: 1-2048 bytes.	Optional	Key Asset attached information, content customized by the service and without integrity protection. Note: In API version 12 and earlier versions, the length is 1-512 bytes.
DATA_LABEL_NORMAL_LOCAL_1¹²⁺	Type: Uint8Array Length: 1-2048 bytes	No	Local attribute information about the asset. The value is defined by the service without integrity protection and will not be synced.
DATA_LABEL_NORMAL_LOCAL_2¹²⁺	Type: Uint8Array Length: 1-2048 bytes	No	Local attribute information about the asset. The value is defined by the service without integrity protection and will not be synced.
DATA_LABEL_NORMAL_LOCAL_3¹²⁺	Type: Uint8Array Length: 1-2048 bytes	No	Local attribute information about the asset. The value is defined by the service without integrity protection and will not be synced.
DATA_LABEL_NORMAL_LOCAL_4¹²⁺	Type: Uint8Array Length: 1-2048 bytes	No	Local attribute information about the asset. The value is defined by the service without integrity protection and will not be synced.
REQUIRE_ATTR_ENCRYPTED¹⁴⁺	Type: Boolean	No	Whether to delete the encrypted data of service customized supplementary information. The value true means to delete the encrypted data of service customized supplementary information; the value false means to delete the non-encrypted data of service customized supplementary information. The default value is false.
GROUP_ID¹⁸⁺	Type: Uint8Array Length: 7-127 bytes	No	Group to which the asset to be removed belongs. By default, this parameter is not specified.

Example

This module provides asynchronous and synchronous APIs. The following uses the asynchronous APIs as an example. For more information about the APIs, see @ohos.security.asset (Asset Store Service).

For details about how to remove an asset from a group, see Removing an Asset from a Group.

Before removing an asset, ensure that the asset exists. For details about how to add an asset, see Adding an Asset. Otherwise, the NOT_FOUND error (24000002) is reported.

Remove asset demo_alias.

Include the header file and define the tool function.

import { asset } from '@kit.AssetStoreKit';
import { util } from '@kit.ArkTS';
import { BusinessError } from '@kit.BasicServicesKit';

function stringToArray(str: string): Uint8Array {
  let textEncoder = new util.TextEncoder();
  return textEncoder.encodeInto(str);
}

Develop the desired feature.

let query: asset.AssetMap = new Map();
query.set(asset.Tag.ALIAS, stringToArray('demo_alias')); // Specify the asset alias to remove a single asset. To remove all assets, leave the alias unspecified.
try {
  asset.remove(query).then(() => {
    console.info(`Succeeded in removing Asset.`);
    // ...
  }).catch((err: BusinessError) => {
    console.error(`Failed to remove Asset. Code is ${err.code}, message is ${err.message}`);
    // ...
  });
} catch (error) {
  let err = error as BusinessError;
  console.error(`Failed to remove Asset. Code is ${err.code}, message is ${err.message}`);
  // ...
}

目录

Removing Assets (ArkTS)

Available APIs

Example