Removing Assets in Batches (ArkTS)

Available APIs

Since version 26.0.0, the system provides the asynchronous API batchRemove for you to remove assets in batches.

The following table describes the attributes of AssetMap for removing assets in batches.

NOTE

In the following table, the attributes ALIAS and those starting with 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 the asset is accessible only when a lock screen password is set. The value false means that the asset 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	No	Asset attribute information customized by the service with integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_CRITICAL_2	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service with integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_CRITICAL_3	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service with integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_CRITICAL_4	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service with integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_NORMAL_1	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service without integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_NORMAL_2	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service without integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_NORMAL_3	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service without integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_NORMAL_4	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service without integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_NORMAL_LOCAL_1¹²⁺	Type: Uint8Array Length: 1-2048 bytes	No	Local attribute information about the asset. The value is assigned 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 assigned 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 assigned 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 assigned 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.

Constraints

The assets to be removed in batches must have the same GROUP_ID and REQUIRE_ATTR_ENCRYPTED attributes.

A maximum of 100 assets can be removed in batches.

Development Procedure

NOTE

The following is an example of using the batch removal API.

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 two assets whose aliases are demo_alias1 and demo_alias2 in batches.

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);
}

batch_operation.ets

Develop the desired feature.

let assetsToBeRemoved: asset.AssetMap[] = [];
let query1: asset.AssetMap = new Map();
query1.set(asset.Tag.ALIAS, stringToArray('demo_alias1'));
assetsToBeRemoved.push(query1);
let query2: asset.AssetMap = new Map();
query2.set(asset.Tag.ALIAS, stringToArray('demo_alias2'));
assetsToBeRemoved.push(query2);

try {
  asset.batchRemove(assetsToBeRemoved).then(() => {
    console.info(`Succeeded in batch removing Asset.`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to batch remove Asset. Code is ${err.code}, message is ${err.message}`);
  })
} catch (error) {
  let err = error as BusinessError;
  console.error(`Failed to batch remove Asset. Code is ${err.code}, message is ${err.message}`);
}

batch_operation.ets