harmony 鸿蒙@ohos.application.BackupExtensionAbility (BackupExtensionAbility)
@ohos.application.BackupExtensionAbility (BackupExtensionAbility)
The BackupExtensionAbility module provides extended backup and restore capabilities for applications.
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.
Modules to Import
import BackupExtension from '@ohos.application.BackupExtensionAbility';
BundleVersion
Defines the version information required for data restore. You can determine the application data to be restored based on the version information.
System capability: SystemCapability.FileManagement.StorageService.Backup
Name | Type | Mandatory | Description |
---|---|---|---|
code | number | Yes | Internal version number of the application. |
name | string | Yes | Version name of the application. |
BackupExtensionAbility
Implements backup and restore for application access data. You can use onBackup and onRestore to implement custom backup and restore operations.
Attributes
System capability: SystemCapability.FileManagement.StorageService.Backup
Name | Type | Readable | Writable | Description |
---|---|---|---|---|
context11+ | ExtensionContext | Yes | No | Context of the BackupExtensionAbility. It inherits from Context. |
onBackup
onBackup(): void;
Called when data is being backed up. You need to implement extended data backup operations.
System capability: SystemCapability.FileManagement.StorageService.Backup
Example
class BackupExt extends BackupExtension {
async onBackup() {
console.log('onBackup');
}
}
onRestore
onRestore(bundleVersion: BundleVersion): void;
Called when data is being restored. You need to implement extended data restore operations.
System capability: SystemCapability.FileManagement.StorageService.Backup
Parameters
Name | Type | Mandatory | Description |
---|---|---|---|
bundleVersion | BundleVersion | Yes | Version information of the application data to be restored. |
Example
import type { BundleVersion } from '@ohos.application.BackupExtensionAbility';
class BackupExt extends BackupExtension {
async onRestore(bundleVersion : BundleVersion) {
console.log(`onRestore ok ${JSON.stringify(bundleVersion)}`);
}
}
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