@ohos.file.cloudSync (Device-Cloud Synchronization)

The cloudSync module provides the device-cloud synchronization capabilities for applications. You can use the APIs to start or stop device-cloud synchronization and start or stop the download of images.

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 are system APIs and cannot be called by third-party applications.

Modules to Import

import cloudSync from '@ohos.file.cloudSync';

SyncState

Enumerates the device-cloud synchronization states.

NOTE

If a synchronization process event listener is registered for an application, a callback will be invoked to notify the application when any of the following states is changed.

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

ErrorType

Enumerates the device-cloud synchronization error types.

• Currently, NETWORK_UNAVAILABLE is returned only when both the mobile network and Wi-Fi are unavailable during synchronization. If either network is available, synchronization can be performed normally.
• During the synchronization process, if the battery level is lower than 15% in non-charging scenarios, BATTERY_LEVEL_LOW will be return when the current upload is complete; if the battery level is lower than 10% in non-charging scenarios, BATTERY_LEVEL_WARNING will be returned when the current upload is complete.
• When synchronization is triggered, if the battery level is lower than 15% in non-charging scenarios, synchronization is not allowed and an error code will be returned by start().
• If the cloud space is insufficient when a file is uploaded, the upload will fail.
• If the local space is insufficient when a file is downloaded, the download will fail. After the local space is released, the file will be downloaded again when synchronization starts.

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

SyncProgress

Defines the device-cloud synchronization process.

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

GallerySync

Provides APIs to implement device-cloud synchronization of media resources of the Gallery. Before using the APIs of GallerySync, you need to create a GallerySync instance.

constructor

constructor()

A constructor used to create a GallerySync instance.

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

Example

  let gallerySync = new cloudSync.GallerySync()

on

on(evt: ‘progress’, callback: (pg: SyncProgress) => void): void

Subscribes to the synchronization process event.

Required permissions: ohos.permission.CLOUDFILE_SYNC

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

Parameters

Error codes

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

Example

  let gallerySync = new cloudSync.GallerySync();

  gallerySync.on('progress', (pg: cloudSync.SyncProgress) => {
    console.info("syncState: " + pg.state);
  });

off

off(evt: ‘progress’, callback: (pg: SyncProgress) => void): void

Unsubscribes from the synchronization process event.

Required permissions: ohos.permission.CLOUDFILE_SYNC

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

Parameters

Error codes

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

Example

  let gallerySync = new cloudSync.GallerySync();

  let callback = (pg: cloudSync.SyncProgress) => {
    console.info("gallery sync state: " + pg.state + "error type:" + pg.error);
  }

  gallerySync.on('progress', callback);

  gallerySync.off('progress', callback);

off

off(evt: ‘progress’): void

Unsubscribes from the synchronization process event.

Required permissions: ohos.permission.CLOUDFILE_SYNC

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

Parameters

Error codes

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

Example

  let gallerySync = new cloudSync.GallerySync();

  gallerySync.on('progress', (pg: cloudSync.SyncProgress) => {
      console.info("syncState: " + pg.state);
  });

  gallerySync.off('progress');

start

start(): Promise<void>

Starts device-cloud synchronization. This API uses a promise to return the result.

Required permissions: ohos.permission.CLOUDFILE_SYNC

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

Return value

Error codes

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

Example

  import { BusinessError } from '@ohos.base';
  let gallerySync = new cloudSync.GallerySync();

  gallerySync.on('progress', (pg: cloudSync.SyncProgress) => {
	  console.info("syncState: " + pg.state);
  });

  gallerySync.start().then(() => {
	  console.info("start sync successfully");
  }).catch((err: BusinessError) => {
	  console.info("start sync failed with error message: " + err.message + ", error code: " + err.code);
  });

start

start(callback: AsyncCallback<void>): void

Starts device-cloud synchronization. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.CLOUDFILE_SYNC

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

Parameters

Error codes

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

Example

  import { BusinessError } from '@ohos.base';
  let gallerySync = new cloudSync.GallerySync();

  gallerySync.start((err: BusinessError) => {
    if (err) {
      console.info("start sync failed with error message: " + err.message + ", error code: " + err.code);
    } else {
      console.info("start sync successfully");
    }
  });

stop

stop(): Promise<void>

Stops device-cloud synchronization. This API uses a promise to return the result.

NOTE

Calling stop will stop the synchronization process. To resume the synchronization, call start.

Required permissions: ohos.permission.CLOUDFILE_SYNC

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

Return value

Error codes

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

Example

  import { BusinessError } from '@ohos.base';
  let gallerySync = new cloudSync.GallerySync();

  gallerySync.stop().then(() => {
	  console.info("stop sync successfully");
  }).catch((err: BusinessError) => {
	  console.info("stop sync failed with error message: " + err.message + ", error code: " + err.code);
  });

stop

stop(callback: AsyncCallback<void>): void

Stops device-cloud synchronization. This API uses an asynchronous callback to return the result.

NOTE

Calling stop will stop the synchronization process. To resume the synchronization, call start.

Required permissions: ohos.permission.CLOUDFILE_SYNC

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

Parameters

Error codes

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

Example

  import { BusinessError } from '@ohos.base';
  let gallerySync = new cloudSync.GallerySync();

  gallerySync.stop((err: BusinessError) => {
    if (err) {
      console.info("stop sync failed with error message: " + err.message + ", error code: " + err.code);
    } else {
      console.info("stop sync successfully");
    }
  });

State

Enumerates the download states of a cloud file.

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

DownloadProgress

Defines the download process of a cloud file.

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

Download

Provides APIs for downloading the image files in Gallery. Before using the APIs of Download, you need to create a Download instance.

constructor

constructor()

A constructor used to create a Download instance.

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

Example

  let download = new cloudSync.Download()

on

on(evt: ‘progress’, callback: (pg: DownloadProgress) => void): void

Subscribes to the cloud file download event.

Required permissions: ohos.permission.CLOUDFILE_SYNC

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

Parameters

Error codes

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

Example

  let download = new cloudSync.Download();

  download.on('progress', (pg: cloudSync.DownloadProgress) => {
    console.info("download state: " + pg.state);
  });

off

off(evt: ‘progress’, callback: (pg: DownloadProgress) => void): void

Unsubscribes from the cloud file download event.

Required permissions: ohos.permission.CLOUDFILE_SYNC

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

Parameters

Error codes

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

Example

  let download = new cloudSync.Download();

  let callback = (pg: cloudSync.DownloadProgress) => {
    console.info("download state: " + pg.state);
  }

  download.on('progress', callback);

  download.off('progress', callback);

off

off(evt: ‘progress’): void

Unsubscribes from the cloud file download event.

Required permissions: ohos.permission.CLOUDFILE_SYNC

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

Parameters

Error codes

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

Example

  let download = new cloudSync.Download();

  download.on('progress', (pg: cloudSync.DownloadProgress) => {
      console.info("download state:" + pg.state);
  });

  download.off('progress');

start

start(uri: string): Promise<void>

Starts to download a cloud file. This API uses a promise to return the result.

Required permissions: ohos.permission.CLOUDFILE_SYNC

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

Parameters

Return value

Example

  import { BusinessError } from '@ohos.base';
  let download = new cloudSync.Download();
  let uri: string = "file:///media/Photo/1";

  download.on('progress', (pg: cloudSync.DownloadProgress) => {
	  console.info("download state:" + pg.state);
  });

  download.start(uri).then(() => {
	  console.info("start download successfully");
  }).catch((err: BusinessError) => {
	  console.info("start download failed with error message: " + err.message + ", error code: " + err.code);
  });

Error codes

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

start

start(uri: string, callback: AsyncCallback<void>): void

Starts to download a cloud file. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.CLOUDFILE_SYNC

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

Parameters

Error codes

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

Example

  import { BusinessError } from '@ohos.base';
  let download = new cloudSync.Download();
  let uri: string = "file:///media/Photo/1";

  download.start(uri, (err: BusinessError) => {
    if (err) {
      console.info("start download failed with error message: " + err.message + ", error code: " + err.code);
    } else {
      console.info("start download successfully");
    }
  });

stop

stop(uri: string): Promise<void>

Stops downloading a cloud file. This API uses a promise to return the result.

NOTE

Calling stop will terminate the download of the current file and clear the cached file. You can use start to start the download again.

Required permissions: ohos.permission.CLOUDFILE_SYNC

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

Parameters

Return value

Error codes

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

Example

  import { BusinessError } from '@ohos.base';
  let download = new cloudSync.Download();
  let uri: string = "file:///media/Photo/1";

  download.stop(uri).then(() => {
	  console.info("stop download successfully");
  }).catch((err: BusinessError) => {
	  console.info("stop download failed with error message: " + err.message + ", error code: " + err.code);
  });

stop

stop(uri: string, callback: AsyncCallback<void>): void

Stops downloading a cloud file. This API uses an asynchronous callback to return the result.

NOTE

Calling stop will terminate the download of the current file and clear the cached file. You can use start to start the download again.

Required permissions: ohos.permission.CLOUDFILE_SYNC

System capability: SystemCapability.FileManagement.DistributedFileService.CloudSync.Core

Parameters

Error codes

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

Example

  import { BusinessError } from '@ohos.base';
  let download = new cloudSync.Download();
  let uri: string = "file:///media/Photo/1";

  download.stop(uri, (err: BusinessError) => {
    if (err) {
      console.info("stop download failed with error message: " + err.message + ", error code: " + err.code);
    } else {
      console.info("stop download successfully");
    }
  });

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