# continuationManager

The **continuationManager** module provides the continuation management entry. You can use the APIs of this module to connect to and cancel the continuation management service, subscribe to and unsubscribe from device connection events, start the device selection module, and update the device connection state.

Currently, this module provides incomplete functions, and its APIs are mainly used to start the device selection module. The continuation capability is not available for application development.

> **NOTE**
> 
> The initial APIs of this module are supported since API version 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.

## Modules to Import

```ts
import continuationManager from '@ohos.continuation.continuationManager'
```

## continuationManager.register<sup>(deprecated)</sup>

register(callback: AsyncCallback\<number>): void;

Registers the continuation management service and obtains a token. This API does not involve any filter parameters and uses an asynchronous callback to return the result.

> This API is deprecated since API version 9. You are advised to use [registerContinuation](#continuationmanagerregistercontinuation9) instead.

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | callback | AsyncCallback\<number> | Yes| Callback used to return the token generated after the continuation management service is connected.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 3 | Failed to flatten the object. |
| 7 | The object is null. |
| 29360207 | The number of registrations has reached the upper limit. |

**Example**

  ```ts
  let token = -1;
  continuationManager.register((err, data) => {
    if (err.code != 0) {
      console.error('register failed, cause: ' + JSON.stringify(err));
      return;
    }
    console.info('register finished, ' + JSON.stringify(data));
    token = data;
  });
  ```

## continuationManager.register<sup>(deprecated)</sup>

register(options: ContinuationExtraParams, callback: AsyncCallback\<number>): void;

Registers the continuation management service and obtains a token. This API uses an asynchronous callback to return the result.

> This API is deprecated since API version 9. You are advised to use [registerContinuation](#continuationmanagerregistercontinuation9) instead.

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | options | [ContinuationExtraParams](js-apis-continuation-continuationExtraParams.md) | Yes| Extra parameters used to filter the list of available devices.|
  | callback | AsyncCallback\<number> | Yes| Callback used to return the token generated after the continuation management service is connected.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 3 | Failed to flatten the object. |
| 7 | The object is null. |
| 29360207 | The number of registrations has reached the upper limit. |
| 29360216 | Invalid continuation mode. |

**Example**

  ```ts
  let token = -1;
  let continuationExtraParams = {
    deviceType: ["00E"]
  };
  continuationManager.register(continuationExtraParams, (err, data) => {
    if (err.code != 0) {
      console.error('register failed, cause: ' + JSON.stringify(err));
      return;
    }
    console.info('register finished, ' + JSON.stringify(data));
    token = data;
  });
  ```

## continuationManager.register<sup>(deprecated)</sup>

register(options?: ContinuationExtraParams): Promise\<number>;

Registers the continuation management service and obtains a token. This API uses a promise to return the result.

> This API is deprecated since API version 9. You are advised to use [registerContinuation](#continuationmanagerregistercontinuation9) instead.

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | options | [ContinuationExtraParams](js-apis-continuation-continuationExtraParams.md) | No| Extra parameters used to filter the list of available devices. This parameter can be null.|

**Return value**

| Type                       | Description                |
| ------------------------- | ------------------ |
| Promise\<number> | Promise used to return the token generated after the continuation management service is connected.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 3 | Failed to flatten the object |
| 7 | The object is null. |
| 29360207 | The number of registrations has reached the upper limit. |
| 29360216 | Invalid continuation mode. |

**Example**

  ```ts
  let token = -1;
  let continuationExtraParams = {
    deviceType: ["00E"]
  };
  continuationManager.register(continuationExtraParams)
    .then((data) => {
      console.info('register finished, ' + JSON.stringify(data));
      token = data;
    })
    .catch((err) => {
      console.error('register failed, cause: ' + JSON.stringify(err));
    });
  ```

## continuationManager.registerContinuation<sup>9+</sup>

registerContinuation(callback: AsyncCallback\<number>): void;

Registers the continuation management service and obtains a token. This API does not involve any filter parameters and uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.DISTRIBUTED_DATASYNC

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | callback | AsyncCallback\<number> | Yes| Callback used to return the token generated after the continuation management service is connected.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 16600001 | The system ability works abnormally. |
| 16600003 | The number of token registration times has reached the upper limit. |

**Example**

  ```ts
  let token = -1;
  try {
    continuationManager.registerContinuation((err, data) => {
      if (err.code != 0) {
        console.error('registerContinuation failed, cause: ' + JSON.stringify(err));
        return;
      }
      console.info('registerContinuation finished, ' + JSON.stringify(data));
      token = data;
    });
  } catch (err) {
    console.error('registerContinuation failed, cause: ' + JSON.stringify(err));
  }
  ```

## continuationManager.registerContinuation<sup>9+</sup>

registerContinuation(options: ContinuationExtraParams, callback: AsyncCallback\<number>): void;

Registers the continuation management service and obtains a token. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.DISTRIBUTED_DATASYNC

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | options | [ContinuationExtraParams](js-apis-continuation-continuationExtraParams.md) | Yes| Extra parameters used to filter the list of available devices.|
  | callback | AsyncCallback\<number> | Yes| Callback used to return the token generated after the continuation management service is connected.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 16600001 | The system ability works abnormally. |
| 16600003 | The number of token registration times has reached the upper limit. |

**Example**

  ```ts
  let token = -1;
  let continuationExtraParams = {
    deviceType: ["00E"]
  };
  try {
    continuationManager.registerContinuation(continuationExtraParams, (err, data) => {
      if (err.code != 0) {
        console.error('registerContinuation failed, cause: ' + JSON.stringify(err));
        return;
      }
      console.info('registerContinuation finished, ' + JSON.stringify(data));
      token = data;
    });
  } catch (err) {
    console.error('registerContinuation failed, cause: ' + JSON.stringify(err));
  }
  ```

## continuationManager.registerContinuation<sup>9+</sup>

registerContinuation(options?: ContinuationExtraParams): Promise\<number>;

Registers the continuation management service and obtains a token. This API uses a promise to return the result.

**Required permissions**: ohos.permission.DISTRIBUTED_DATASYNC

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | options | [ContinuationExtraParams](js-apis-continuation-continuationExtraParams.md) | No| Extra parameters used to filter the list of available devices. This parameter can be null.|

**Return value**

| Type                       | Description                |
| ------------------------- | ------------------ |
| Promise\<number> | Promise used to return the token generated after the continuation management service is connected.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 16600001 | The system ability works abnormally. |
| 16600003 | The number of token registration times has reached the upper limit. |

**Example**

  ```ts
  let token = -1;
  let continuationExtraParams = {
    deviceType: ["00E"]
  };
  try {
    continuationManager.register(continuationExtraParams)
      .then((data) => {
        console.info('registerContinuation finished, ' + JSON.stringify(data));
        token = data;
      })
      .catch((err) => {
        console.error('registerContinuation failed, cause: ' + JSON.stringify(err));
      });
  } catch (err) {
    console.error('registerContinuation failed, cause: ' + JSON.stringify(err));
  }
  ```


## continuationManager.on("deviceConnect")<sup>(deprecated)</sup>

on(type: "deviceConnect", callback: Callback\<ContinuationResult>): void;

Subscribes to device connection events. This API uses an asynchronous callback to return the result.

> This API is deprecated since API version 9. You are advised to use [on](#continuationmanagerondeviceselected9) instead.

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | type | string | Yes| Event type. The value is fixed at **deviceConnect**.|
  | callback | Callback\<[ContinuationResult](js-apis-continuation-continuationResult.md)> | Yes| Callback invoked when a device is selected from the device list provided by the device selection module. This callback returns the device ID, type, and name.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 3 | Failed to flatten the object |
| 7 | The object is null | 7 |
| 29360208 | The token is not registered. |
| 29360209 | The callback has been registered. |
| 29360214 | The type of callback is not supported. |

**Example**

  ```ts
  continuationManager.on("deviceConnect", (data) => {
    console.info('onDeviceConnect deviceId: ' + JSON.stringify(data.id));
    console.info('onDeviceConnect deviceType: ' + JSON.stringify(data.type));
    console.info('onDeviceConnect deviceName: ' + JSON.stringify(data.name));
  });
  ```

## continuationManager.on("deviceDisconnect")<sup>(deprecated)</sup>

on(type: "deviceDisconnect", callback: Callback\<string>): void;

Subscribes to device disconnection events. This API uses an asynchronous callback to return the result.

> This API is deprecated since API version 9. You are advised to use [on](#continuationmanagerondeviceunselected9) instead.

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | type | string | Yes| Event type. The value is fixed at **deviceDisconnect**.|
  | callback | Callback\<string> | Yes| Callback invoked when a device is unselected from the device list provided by the device selection module. This callback returns the device ID.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 3 | Failed to flatten the object. |
| 7 | The object is null. |
| 29360208 | The token is not registered. |
| 29360209 | The callback has been registered. |
| 29360214 | The type of callback is not supported. |

**Example**

  ```ts
  continuationManager.on("deviceDisconnect", (data) => {
    console.info('onDeviceDisconnect deviceId: ' + JSON.stringify(data));
  });
  ```

## continuationManager.off("deviceConnect")<sup>(deprecated)</sup>

off(type: "deviceConnect", callback?: Callback\<ContinuationResult>): void;

Unsubscribes from device connection events. This API uses an asynchronous callback to return the result.

> This API is deprecated since API version 9. You are advised to use [off](#continuationmanageroffdeviceselected9) instead.

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | type | string | Yes| Event type. The value is fixed at **deviceConnect**.|
  | callback | Callback\<[ContinuationResult](js-apis-continuation-continuationResult.md)> | No| Callback invoked when a device is selected from the device list provided by the device selection module. This callback returns the device ID, type, and name.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 3 | Failed to flatten the object. |
| 7 | The object is null. |
| 29360208 | The token is not registered. |
| 29360210 | The callback is not registered. |
| 29360214 | The type of callback is not supported. |

**Example**

  ```ts
  continuationManager.off("deviceConnect", (data) => {
    console.info('onDeviceConnect deviceId: ' + JSON.stringify(data.id));
    console.info('onDeviceConnect deviceType: ' + JSON.stringify(data.type));
    console.info('onDeviceConnect deviceName: ' + JSON.stringify(data.name));
  });
  ```

## continuationManager.off("deviceDisconnect")<sup>(deprecated)</sup>

off(type: "deviceDisconnect", callback?: Callback\<string>): void;

Unsubscribes from device disconnection events. This API uses an asynchronous callback to return the result.

> This API is deprecated since API version 9. You are advised to use [off](#continuationmanageroffdeviceunselected9) instead.

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | type | string | Yes| Event type. The value is fixed at **deviceDisconnect**.|
  | callback | Callback\<string> | No| Callback invoked when a device is selected from the device list provided by the device selection module. This callback returns the device ID.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 3 | Failed to flatten the object. |
| 7 | The object is null. |
| 29360208 | The token is not registered. |
| 29360210 | The callback is not registered. |
| 29360214 | The type of callback is not supported. |

**Example**

  ```ts
  continuationManager.off("deviceDisconnect", (data) => {
    console.info('onDeviceDisconnect deviceId: ' + JSON.stringify(data));
  });
  ```

## continuationManager.on("deviceSelected")<sup>9+</sup>

on(type: "deviceSelected", token: number, callback: Callback\<Array\<ContinuationResult>>): void;

Subscribes to device connection events. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.DISTRIBUTED_DATASYNC

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | type | string | Yes| Event type. The value is fixed at **deviceSelected**.|
  | token | number | Yes| Token obtained after the registration of the continuation management service.|
  | callback | Callback\<Array\<[ContinuationResult](js-apis-continuation-continuationResult.md)>> | Yes| Callback invoked when a device is selected from the device list provided by the device selection module. This callback returns the device ID, type, and name.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 16600001 | The system ability works abnormally. |
| 16600002 | The specified token or callback is not registered. |
| 16600004 | The specified callback has been registered. |

**Example**

  ```ts
  let token = 1;
  try {
    continuationManager.on("deviceSelected", token, (data) => {
      console.info('onDeviceSelected len: ' + data.length);
      for (let i = 0; i < data.length; i++) {
        console.info('onDeviceSelected deviceId: ' + JSON.stringify(data[i].id));
        console.info('onDeviceSelected deviceType: ' + JSON.stringify(data[i].type));
        console.info('onDeviceSelected deviceName: ' + JSON.stringify(data[i].name));
      }
    });
  } catch (err) {
    console.error('on failed, cause: ' + JSON.stringify(err));
  }
  ```

## continuationManager.on("deviceUnselected")<sup>9+</sup>

on(type: "deviceUnselected", token: number, callback: Callback\<Array\<ContinuationResult>>): void;

Subscribes to device disconnection events. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.DISTRIBUTED_DATASYNC

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | type | string | Yes| Event type. The value is fixed at **deviceUnselected**.|
  | token | number | Yes| Token obtained after the registration of the continuation management service.|
  | callback | Callback\<Array\<[ContinuationResult](js-apis-continuation-continuationResult.md)>> | Yes| Callback invoked when a device is unselected from the device list provided by the device selection module. This callback returns the device ID, type, and name.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 16600001 | The system ability works abnormally. |
| 16600002 | The specified token or callback is not registered. |
| 16600004 | The specified callback has been registered. |

**Example**

  ```ts
  let token = 1;
  try {
    continuationManager.on("deviceUnselected", token, (data) => {
      console.info('onDeviceUnselected len: ' + data.length);
      for (let i = 0; i < data.length; i++) {
        console.info('onDeviceUnselected deviceId: ' + JSON.stringify(data[i].id));
        console.info('onDeviceUnselected deviceType: ' + JSON.stringify(data[i].type));
        console.info('onDeviceUnselected deviceName: ' + JSON.stringify(data[i].name));
      }
      console.info('onDeviceUnselected finished.');
    });
  } catch (err) {
    console.error('on failed, cause: ' + JSON.stringify(err));
  }
  ```

## continuationManager.off("deviceSelected")<sup>9+</sup>

off(type: "deviceSelected", token: number): void;

Unsubscribes from device connection events.

**Required permissions**: ohos.permission.DISTRIBUTED_DATASYNC

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | type | string | Yes| Event type. The value is fixed at **deviceSelected**.|
  | token | number | Yes| Token obtained after the registration of the continuation management service.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 16600001 | The system ability works abnormally. |
| 16600002 | The specified token or callback is not registered. |
| 16600004 | The specified callback has been registered. |

**Example**

  ```ts
  let token = 1;
  try {
    continuationManager.off("deviceSelected", token);
  } catch (err) {
    console.error('off failed, cause: ' + JSON.stringify(err));
  }
  ```

## continuationManager.off("deviceUnselected")<sup>9+</sup>

off(type: "deviceUnselected", token: number): void;

Unsubscribes from device disconnection events.

**Required permissions**: ohos.permission.DISTRIBUTED_DATASYNC

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | type | string | Yes| Event type. The value is fixed at **deviceUnselected**.|
  | token | number | Yes| Token obtained after the registration of the continuation management service.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 16600001 | The system ability works abnormally. |
| 16600002 | The specified token or callback is not registered. |
| 16600004 | The specified callback has been registered. |

**Example**

  ```ts
  let token = 1;
  try {
    continuationManager.off("deviceUnselected", token);
  } catch (err) {
    console.error('off failed, cause: ' + JSON.stringify(err));
  }
  ```

## continuationManager.startDeviceManager<sup>(deprecated)</sup>

startDeviceManager(token: number, callback: AsyncCallback\<void>): void;

Starts the device selection module to show the list of available devices on the network. This API does not involve any filter parameters and uses an asynchronous callback to return the result.

> This API is deprecated since API version 9. You are advised to use [startContinuationDeviceManager](#continuationmanagerstartcontinuationdevicemanager9) instead.

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | token | number | Yes| Token obtained after the registration of the continuation management service.|
  | callback | AsyncCallback\<void> | Yes| Callback used to return the result.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 3 | Failed to flatten the object. |
| 7 | The object is null. |
| 29360208 | The token is not registered. |
| 29360210 | The callback is not registered. |
| 29360211 | Failed to connect to the ability. |
| 29360216 | Invalid continuation mode. |

**Example**

  ```ts
  let token = 1;
  continuationManager.startDeviceManager(token, (err, data) => {
    if (err.code != 0) {
      console.error('startDeviceManager failed, cause: ' + JSON.stringify(err));
      return;
    }
    console.info('startDeviceManager finished, ' + JSON.stringify(data));
  });
  ```

## continuationManager.startDeviceManager<sup>(deprecated)</sup>

startDeviceManager(token: number, options: ContinuationExtraParams, callback: AsyncCallback\<void>): void;

Starts the device selection module to show the list of available devices on the network. This API uses an asynchronous callback to return the result.

> This API is deprecated since API version 9. You are advised to use [startContinuationDeviceManager](#continuationmanagerstartcontinuationdevicemanager9) instead.

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | token | number | Yes| Token obtained after the registration of the continuation management service.|
  | options | [ContinuationExtraParams](js-apis-continuation-continuationExtraParams.md) | Yes| Extra parameters used to filter the list of available devices.|
  | callback | AsyncCallback\<void> | Yes| Callback used to return the result.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 3 | Failed to flatten the object |
| 7 | The object is null |
| 29360208 | The token is not registered. |
| 29360210 | The callback is not registered. |
| 29360211 | Failed to connect to the ability. |
| 29360216 | Invalid continuation mode. |

**Example**

  ```ts
  let token = 1;
  let continuationExtraParams = {
    deviceType: ["00E"]
  };
  continuationManager.startDeviceManager(token, continuationExtraParams, (err, data) => {
    if (err.code != 0) {
      console.error('startDeviceManager failed, cause: ' + JSON.stringify(err));
      return;
    }
    console.info('startDeviceManager finished, ' + JSON.stringify(data));
  });
  ```

## continuationManager.startDeviceManager<sup>(deprecated)</sup>

startDeviceManager(token: number, options?: ContinuationExtraParams): Promise\<void>;

Starts the device selection module to show the list of available devices on the network. This API uses a promise to return the result.

> This API is deprecated since API version 9. You are advised to use [startContinuationDeviceManager](#continuationmanagerstartcontinuationdevicemanager9) instead.

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | token | number | Yes| Token obtained after the registration of the continuation management service.|
  | options | [ContinuationExtraParams](js-apis-continuation-continuationExtraParams.md) | No| Extra parameters used to filter the list of available devices. This parameter can be null.|

**Return value**

| Type                       | Description                |
| ------------------------- | ------------------ |
| Promise\<void> | Promise used to return the result.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 3 | Failed to flatten the object |
| 7 | The object is null |
| 29360208 | The token is not registered. |
| 29360210 | The callback is not registered. |
| 29360211 | Failed to connect to the ability. |
| 29360216 | Invalid continuation mode. |

**Example**

  ```ts
  let token = 1;
  let continuationExtraParams = {
    deviceType: ["00E"]
  };
  continuationManager.startDeviceManager(token, continuationExtraParams)
    .then((data) => {
      console.info('startDeviceManager finished, ' + JSON.stringify(data));
    })
    .catch((err) => {
      console.error('startDeviceManager failed, cause: ' + JSON.stringify(err));
    });
  ```

## continuationManager.startContinuationDeviceManager<sup>9+</sup>

startContinuationDeviceManager(token: number, callback: AsyncCallback\<void>): void;

Starts the device selection module to show the list of available devices on the network. This API does not involve any filter parameters and uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.DISTRIBUTED_DATASYNC

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | token | number | Yes| Token obtained after the registration of the continuation management service.|
  | callback | AsyncCallback\<void> | Yes| Callback used to return the result.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 16600001 | The system ability works abnormally. |
| 16600002 | The specified token or callback is not registered. |

**Example**

  ```ts
  let token = 1;
  try {
    continuationManager.startContinuationDeviceManager(token, (err, data) => {
      if (err.code != 0) {
        console.error('startContinuationDeviceManager failed, cause: ' + JSON.stringify(err));
        return;
      }
      console.info('startContinuationDeviceManager finished, ' + JSON.stringify(data));
    });
  } catch (err) {
    console.error('startContinuationDeviceManager failed, cause: ' + JSON.stringify(err));
  }
  ```

## continuationManager.startContinuationDeviceManager<sup>9+</sup>

startContinuationDeviceManager(token: number, options: ContinuationExtraParams, callback: AsyncCallback\<void>): void;

Starts the device selection module to show the list of available devices on the network. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.DISTRIBUTED_DATASYNC

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | token | number | Yes| Token obtained after the registration of the continuation management service.|
  | options | [ContinuationExtraParams](js-apis-continuation-continuationExtraParams.md) | Yes| Extra parameters used to filter the list of available devices.|
  | callback | AsyncCallback\<void> | Yes| Callback used to return the result.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 16600001 | The system ability works abnormally. |
| 16600002 | The specified token or callback is not registered. |

**Example**

  ```ts
  let token = 1;
  let continuationExtraParams = {
    deviceType: ["00E"]
  };
  try {
    continuationManager.startContinuationDeviceManager(token, continuationExtraParams, (err, data) => {
      if (err.code != 0) {
        console.error('startContinuationDeviceManager failed, cause: ' + JSON.stringify(err));
        return;
      }
      console.info('startContinuationDeviceManager finished, ' + JSON.stringify(data));
    });
  } catch (err) {
    console.error('startContinuationDeviceManager failed, cause: ' + JSON.stringify(err));
  }
  ```

## continuationManager.startContinuationDeviceManager<sup>9+</sup>

startContinuationDeviceManager(token: number, options?: ContinuationExtraParams): Promise\<void>;

Starts the device selection module to show the list of available devices on the network. This API uses a promise to return the result.

**Required permissions**: ohos.permission.DISTRIBUTED_DATASYNC

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | token | number | Yes| Token obtained after the registration of the continuation management service.|
  | options | [ContinuationExtraParams](js-apis-continuation-continuationExtraParams.md) | No| Extra parameters used to filter the list of available devices. This parameter can be null.|

**Return value**

| Type                       | Description                |
| ------------------------- | ------------------ |
| Promise\<void> | Promise used to return the result.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 16600001 | The system ability works abnormally. |
| 16600002 | The specified token or callback is not registered. |

**Example**

  ```ts
  let token = 1;
  let continuationExtraParams = {
    deviceType: ["00E"]
  };
  try {
    continuationManager.startContinuationDeviceManager(token, continuationExtraParams)
      .then((data) => {
        console.info('startContinuationDeviceManager finished, ' + JSON.stringify(data));
      })
      .catch((err) => {
        console.error('startContinuationDeviceManager failed, cause: ' + JSON.stringify(err));
      });
  } catch (err) {
    console.error('startContinuationDeviceManager failed, cause: ' + JSON.stringify(err));
  }
  ```

## continuationManager.updateConnectStatus<sup>(deprecated)</sup>

updateConnectStatus(token: number, deviceId: string, status: DeviceConnectState, callback: AsyncCallback\<void>): void;

Instructs the device selection module to update the device connection state. This API uses an asynchronous callback to return the result.

> This API is deprecated since API version 9. You are advised to use [updateContinuationState](#continuationmanagerupdatecontinuationstate9) instead.

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | token | number | Yes| Token obtained after the registration of the continuation management service.|
  | deviceId | string | Yes| Device ID.|
  | status | [DeviceConnectState](#deviceconnectstate) | Yes| Device connection state.|
  | callback | AsyncCallback\<void> | Yes| Callback used to return the result.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 3 | Failed to flatten the object. |
| 7 | The object is null. |
| 29360208 | The token is not registered. |
| 29360210 | The callback is not registered. |
| 29360211 | Failed to connect to the ability. |
| 29360215 | Invalid connection state. |

**Example**

  ```ts
  let token = 1;
  let deviceId: string = "test deviceId";
  continuationManager.updateConnectStatus(token, deviceId, continuationManager.DeviceConnectState.CONNECTED, (err, data) => {
    if (err.code != 0) {
      console.error('updateConnectStatus failed, cause: ' + JSON.stringify(err));
      return;
    }
    console.info('updateConnectStatus finished, ' + JSON.stringify(data));
  });
  ```

## continuationManager.updateConnectStatus<sup>(deprecated)</sup>

updateConnectStatus(token: number, deviceId: string, status: DeviceConnectState): Promise\<void>;

Instructs the device selection module to update the device connection state. This API uses a promise to return the result.

> This API is deprecated since API version 9. You are advised to use [updateContinuationState](#continuationmanagerupdatecontinuationstate9) instead.

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | token | number | Yes| Token obtained after the registration of the continuation management service.|
  | deviceId | string | Yes| Device ID.|
  | status | [DeviceConnectState](#deviceconnectstate) | Yes| Device connection state.|

**Return value**

| Type                       | Description                |
| ------------------------- | ------------------ |
| Promise\<void> | Promise used to return the result.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 3 | Failed to flatten the object. |
| 7 | The object is null. |
| 29360208 | The token is not registered. |
| 29360210 | The callback is not registered. |
| 29360211 | Failed to connect to the ability. |
| 29360215 | Invalid connection state. |

**Example**

  ```ts
  let token = 1;
  let deviceId: string = "test deviceId";
  continuationManager.updateConnectStatus(token, deviceId, continuationManager.DeviceConnectState.CONNECTED)
    .then((data) => {
      console.info('updateConnectStatus finished, ' + JSON.stringify(data));
    })
    .catch((err) => {
      console.error('updateConnectStatus failed, cause: ' + JSON.stringify(err));
    });
  ```

## continuationManager.updateContinuationState<sup>9+</sup>

updateContinuationState(token: number, deviceId: string, status: DeviceConnectState, callback: AsyncCallback\<void>): void;

Instructs the device selection module to update the device connection state. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.DISTRIBUTED_DATASYNC

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | token | number | Yes| Token obtained after the registration of the continuation management service.|
  | deviceId | string | Yes| Device ID.|
  | status | [DeviceConnectState](#deviceconnectstate) | Yes| Device connection state.|
  | callback | AsyncCallback\<void> | Yes| Callback used to return the result.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 16600001 | The system ability works abnormally. |
| 16600002 | The specified token or callback is not registered. |

**Example**

  ```ts
  let token = 1;
  let deviceId: string = "test deviceId";
  try {
    continuationManager.updateContinuationState(token, deviceId, continuationManager.DeviceConnectState.CONNECTED, (err, data) => {
      if (err.code != 0) {
        console.error('updateContinuationState failed, cause: ' + JSON.stringify(err));
        return;
      }
      console.info('updateContinuationState finished, ' + JSON.stringify(data));
    });
  } catch (err) {
    console.error('updateContinuationState failed, cause: ' + JSON.stringify(err));
  }
  ```

## continuationManager.updateContinuationState<sup>9+</sup>

updateContinuationState(token: number, deviceId: string, status: DeviceConnectState): Promise\<void>;

Instructs the device selection module to update the device connection state. This API uses a promise to return the result.

**Required permissions**: ohos.permission.DISTRIBUTED_DATASYNC

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | token | number | Yes| Token obtained after the registration of the continuation management service.|
  | deviceId | string | Yes| Device ID.|
  | status | [DeviceConnectState](#deviceconnectstate) | Yes| Device connection state.|

**Return value**

| Type                       | Description                |
| ------------------------- | ------------------ |
| Promise\<void> | Promise used to return the result.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 16600001 | The system ability works abnormally. |
| 16600002 | The specified token or callback is not registered. |

**Example**

  ```ts
  let token = 1;
  let deviceId: string = "test deviceId";
  try {
    continuationManager.updateContinuationState(token, deviceId, continuationManager.DeviceConnectState.CONNECTED)
      .then((data) => {
        console.info('updateContinuationState finished, ' + JSON.stringify(data));
      })
      .catch((err) => {
        console.error('updateContinuationState failed, cause: ' + JSON.stringify(err));
      });
  } catch (err) {
    console.error('updateContinuationState failed, cause: ' + JSON.stringify(err));
  }
  ```


## continuationManager.unregister<sup>(deprecated)</sup>

unregister(token: number, callback: AsyncCallback\<void>): void;

Deregisters the continuation management service. This API uses an asynchronous callback to return the result.

> This API is deprecated since API version 9. You are advised to use [unregisterContinuation](#continuationmanagerunregistercontinuation9) instead.

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | token | number | Yes| Token obtained after the registration of the continuation management service.|
  | callback | AsyncCallback\<void> | Yes| Callback used to return the result.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 3 | Failed to flatten the object. |
| 7 | The object is null. |
| 29360208 | The token is not registered. |

**Example**

  ```ts
  let token = 1;
  continuationManager.unregister(token, (err, data) => {
    if (err.code != 0) {
      console.error('unregister failed, cause: ' + JSON.stringify(err));
      return;
    }
    console.info('unregister finished, ' + JSON.stringify(data));
  });
  ```

## continuationManager.unregister<sup>(deprecated)</sup>

unregister(token: number): Promise\<void>;

Deregisters the continuation management service. This API uses a promise to return the result.

> This API is deprecated since API version 9. You are advised to use [unregisterContinuation](#continuationmanagerunregistercontinuation9) instead.

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | token | number | Yes| Token obtained after the registration of the continuation management service.|

**Return value**

| Type                       | Description                |
| ------------------------- | ------------------ |
| Promise\<void> | Promise used to return the result.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 3 | Failed to flatten the object. |
| 7 | The object is null. |
| 29360208 | The token is not registered. |

**Example**

  ```ts
  let token = 1;
  continuationManager.unregister(token)
    .then((data) => {
      console.info('unregister finished, ' + JSON.stringify(data));
    })
    .catch((err) => {
      console.error('unregister failed, cause: ' + JSON.stringify(err));
    });
  ```

## continuationManager.unregisterContinuation<sup>9+</sup>

unregisterContinuation(token: number, callback: AsyncCallback\<void>): void;

Deregisters the continuation management service. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.DISTRIBUTED_DATASYNC

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | token | number | Yes| Token obtained after the registration of the continuation management service.|
  | callback | AsyncCallback\<void> | Yes| Callback used to return the result.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 16600001 | The system ability works abnormally. |
| 16600002 | The specified token or callback is not registered. |

**Example**

  ```ts
  let token = 1;
  try {
    continuationManager.unregisterContinuation(token, (err, data) => {
      if (err.code != 0) {
        console.error('unregisterContinuation failed, cause: ' + JSON.stringify(err));
        return;
      }
      console.info('unregisterContinuation finished, ' + JSON.stringify(data));
    });
  } catch (err) {
    console.error('unregisterContinuation failed, cause: ' + JSON.stringify(err));
  }
  ```

## continuationManager.unregisterContinuation<sup>9+</sup>

unregisterContinuation(token: number): Promise\<void>;

Deregisters the continuation management service. This API uses a promise to return the result.

**Required permissions**: ohos.permission.DISTRIBUTED_DATASYNC

**System capability**: SystemCapability.Ability.DistributedAbilityManager

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | token | number | Yes| Token obtained after the registration of the continuation management service.|

**Return value**

| Type                       | Description                |
| ------------------------- | ------------------ |
| Promise\<void> | Promise used to return the result.|

**Error codes**

For details about the error codes, see [Distributed Scheduler Error Codes](../errorcodes/errorcode-DistributedSchedule.md).

| ID| Error Message|
| ------- | -------------------------------------------- |
| 16600001 | The system ability works abnormally. |
| 16600002 | The specified token or callback is not registered. |

**Example**

  ```ts
  let token = 1;
  try {
    continuationManager.unregisterContinuation(token)
      .then((data) => {
        console.info('unregisterContinuation finished, ' + JSON.stringify(data));
      })
      .catch((err) => {
        console.error('unregisterContinuation failed, cause: ' + JSON.stringify(err));
      });
  } catch (err) {
    console.error('unregisterContinuation failed, cause: ' + JSON.stringify(err));
  }
  ```


## DeviceConnectState

Enumerates the device connection states.

**System capability**: SystemCapability.Ability.DistributedAbilityManager

| Name| Value| Description|
| -------- | -------- | -------- |
| IDLE | 0 | The device is in the initial state.|
| CONNECTING | 1 | The device is being connected.|
| CONNECTED | 2 | The device is connected.|
| DISCONNECTING | 3 | The device is being disconnected.|

## ContinuationMode

Enumerates the continuation modes provided by the device selection module.

**System capability**: SystemCapability.Ability.DistributedAbilityManager

| Name| Value| Description|
| -------- | -------- | -------- |
| COLLABORATION_SINGLE | 0 | Single-choice mode.|
| COLLABORATION_MULTIPLE | 1 | Multi-choice mode.|