# AbilityContext

The **AbilityContext** module, inherited from **Context**, implements the context for abilities.

This module provides APIs for accessing ability-specific resources. You can use the APIs to start and terminate an ability, obtain the caller interface, and request permissions from users by displaying a dialog box.

> **NOTE**
> 
> The initial APIs of this module are supported since API version 9. 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.

## Usage

Before using the **AbilityContext** module, you must define a child class that inherits from **Ability**.

```js
import Ability from '@ohos.application.Ability'
class MainAbility extends Ability {
    onWindowStageCreate(windowStage) {
        let context = this.context;
    }
}
```

## Attributes

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

| Name| Type| Readable| Writable| Description|
| -------- | -------- | -------- | -------- | -------- |
| abilityInfo | AbilityInfo | Yes| No| Ability information.|
| currentHapModuleInfo | HapModuleInfo | Yes| No| Information about the current HAP.|
| config | [Configuration](js-apis-configuration.md) | Yes| No| Configuration information.|

## AbilityContext.startAbility

startAbility(want: Want, callback: AsyncCallback<void>): void

Starts an ability. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability.|
| callback | AsyncCallback<void> | Yes| Callback used to return the result.|

**Example**

  ```js
  var want = {
  	"deviceId": "",
  	"bundleName": "com.extreme.test",
  	"abilityName": "MainAbility"
  };
  this.context.startAbility(want, (error) => {
      console.log("error.code = " + error.code)
  })
  ```


## AbilityContext.startAbility

startAbility(want: Want, options: StartOptions, callback: AsyncCallback<void>): void

Starts an ability with start options specified. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md)  | Yes| Information about the target ability.|
| options | [StartOptions](js-apis-application-StartOptions.md) | Yes| Parameters used for starting the ability.|
| callback | AsyncCallback<void> | Yes| Callback used to return the result.|

**Example**
    
  ```js
  var want = {
  	"deviceId": "",
  	"bundleName": "com.extreme.test",
  	"abilityName": "MainAbility"
  };
  var options = {
  	windowMode: 0,
  };
  this.context.startAbility(want, options, (error) => {
      console.log("error.code = " + error.code)
  })
  ```


## AbilityContext.startAbility

startAbility(want: Want, options?: StartOptions): Promise<void>;

Starts an ability. This API uses a promise to return the result.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability.|
| options | [StartOptions](js-apis-application-StartOptions.md) | No| Parameters used for starting the ability.|

**Return value**

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

**Example**

  ```js
  var want = {
  	"deviceId": "",
  	"bundleName": "com.extreme.test",
  	"abilityName": "MainAbility"
  };
  var options = {
  	windowMode: 0,
  };
  this.context.startAbility(want, options)
  .then((data) => {
      console.log('Operation successful.')
  }).catch((error) => {
      console.log('Operation failed.');
  })
  ```


## AbilityContext.startAbilityForResult

startAbilityForResult(want: Want, callback: AsyncCallback<AbilityResult>): void;

Starts an ability. This API uses an asynchronous callback to return the result when the ability is terminated.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want |[Want](js-apis-application-Want.md) | Yes| Information about the target ability.|
| callback | AsyncCallback<[AbilityResult](js-apis-featureAbility.md#abilityresult)> | Yes| Callback used to return the result.|


**Example**

  ```js
  this.context.startAbilityForResult(
      {deviceId: "", bundleName: "com.extreme.myapplication", abilityName: "MainAbilityDemo2"},
      (error, result) => {
          console.log("startAbilityForResult AsyncCallback is called, error.code = " + error.code)
          console.log("startAbilityForResult AsyncCallback is called, result.resultCode = " + result.resultCode)
       }
  );
  ```

## AbilityContext.startAbilityForResult

startAbilityForResult(want: Want, options: StartOptions, callback: AsyncCallback<AbilityResult>): void;

Starts an ability with start options specified. This API uses an asynchronous callback to return the result when the ability is terminated.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want |[Want](js-apis-application-Want.md) | Yes| Information about the target ability.|
| options | [StartOptions](js-apis-application-StartOptions.md) | Yes| Parameters used for starting the ability.|
| callback | AsyncCallback<[AbilityResult](js-apis-featureAbility.md#abilityresult)> | Yes| Callback used to return the result.|


**Example**

  ```js
  var options = {
    windowMode: 0,
  };
  this.context.startAbilityForResult(
      {deviceId: "", bundleName: "com.extreme.myapplication", abilityName: "MainAbilityDemo2"}, options,
      (error, result) => {
          console.log("startAbilityForResult AsyncCallback is called, error.code = " + error.code)
          console.log("startAbilityForResult AsyncCallback is called, result.resultCode = " + result.resultCode)
       }
  );
  ```


## AbilityContext.startAbilityForResult

startAbilityForResult(want: Want, options?: StartOptions): Promise<AbilityResult>;

Starts an ability. This API uses a promise to return the result when the ability is terminated.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability.|
| options | [StartOptions](js-apis-application-StartOptions.md) | No| Parameters used for starting the ability.|


**Return value**

| Type| Description|
| -------- | -------- |
| Promise<[AbilityResult](js-apis-featureAbility.md#abilityresult)> | Promise used to return the result.|

**Example**

  ```js
  var options = {
    windowMode: 0,
  };
  this.context.startAbilityForResult({deviceId: "", bundleName: "com.extreme.myapplication", abilityName: "MainAbilityDemo2"}, options).then((result) => {
      console.log("startAbilityForResult Promise.resolve is called, result.resultCode = " + result.resultCode)
  }, (error) => {
      console.log("startAbilityForResult Promise.Reject is called, error.code = " + error.code)
  })
  ```

## AbilityContext.startAbilityForResultWithAccount

startAbilityForResultWithAccount(want: Want, accountId: number, callback: AsyncCallback\<AbilityResult>): void;

Starts an ability. This API uses an asynchronous callback to return the result when the account of the ability is destroyed.

**Required permissions**: ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability.|
| accountId | number | Yes| ID of a system account. For details, see [getCreatedOsAccountsCount](js-apis-osAccount.md#getosaccountlocalidfromprocess).|
| callback | AsyncCallback\<AbilityResult\> | Yes| Callback used to return the result.|

**Example**

  ```js
  var want = {
    "deviceId": "",
    "bundleName": "com.extreme.test",
    "abilityName": "MainAbility"
  };
  var accountId = 100;
  this.context.startAbilityWithAccount(want, accountId, (err, data) => {
    console.log('---------- startAbilityWithAccount fail, err:  -----------', err);
    console.log('---------- startAbilityWithAccount success, data:  -----------', data);
  });
  ```


## AbilityContext.startAbilityForResultWithAccount

startAbilityForResultWithAccount(want: Want, accountId: number, options: StartOptions, callback: AsyncCallback\<void\>): void;

Starts an ability with start options specified. This API uses an asynchronous callback to return the result when the account of the ability is destroyed.

**Required permissions**: ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability.|
| accountId | number | Yes| ID of a system account. For details, see [getCreatedOsAccountsCount](js-apis-osAccount.md#getosaccountlocalidfromprocess).|
| options | [StartOptions](js-apis-application-StartOptions.md) | Yes| Parameters used for starting the ability.|
| callback | AsyncCallback\<void\> | Yes| Callback used to return the result.|

**Example**

  ```js
  var want = {
    "deviceId": "",
    "bundleName": "com.extreme.test",
    "abilityName": "MainAbility"
  };
  var accountId = 100;
  var options = {
    windowMode: 0,
  };
  this.context.startAbilityForResultWithAccount(want, accountId, options, (err) => {
    console.log('---------- startAbilityForResultWithAccount fail, err:  -----------', err);
  });
  ```


## AbilityContext.startAbilityForResultWithAccount

startAbilityForResultWithAccount(want: Want, accountId: number, options?: StartOptions): Promise\<AbilityResult\>;

Starts an ability with start options specified. This API uses a promise to return the result when the account of the ability is destroyed.

**Required permissions**: ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability.|
| accountId | number | Yes| ID of a system account. For details, see [getCreatedOsAccountsCount](js-apis-osAccount.md#getosaccountlocalidfromprocess).|
| options | [StartOptions](js-apis-application-StartOptions.md) | No| Parameters used for starting the ability.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;AbilityResult&gt; | Promise used to return the result.|

**Example**

  ```js
  var want = {
    "deviceId": "",
    "bundleName": "com.extreme.test",
    "abilityName": "MainAbility"
  };
  var accountId = 100;
  var options = {
    windowMode: 0,
  };
  this.context.startAbilityForResultWithAccount(want, accountId, options)
    .then((data) => {
        console.log('---------- startAbilityForResultWithAccount success, data:  -----------', data);
    })
    .catch((err) => {
        console.log('---------- startAbilityForResultWithAccount fail, err:  -----------', err);
    })
  ```
## AbilityContext.startServiceExtensionAbility

startServiceExtensionAbility(want: Want, callback: AsyncCallback\<void>): void;

Starts a new Service Extension ability. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability.|
| callback | AsyncCallback\<void\> | Yes| Callback used to return the result.|

**Example**

  ```js
  var want = {
    "deviceId": "",
    "bundleName": "com.extreme.test",
    "abilityName": "MainAbility"
  };
  this.context.startServiceExtensionAbility(want, (err) => {
    console.log('---------- startServiceExtensionAbility fail, err:  -----------', err);
  });
  ```

## AbilityContext.startServiceExtensionAbility

startServiceExtensionAbility(want: Want): Promise\<void>;

Starts a new Service Extension ability. This API uses a promise to return the result.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability.|

**Example**

  ```js
  var want = {
    "deviceId": "",
    "bundleName": "com.extreme.test",
    "abilityName": "MainAbility"
  };
  this.context.startServiceExtensionAbility(want)
    .then((data) => {
        console.log('---------- startServiceExtensionAbility success, data:  -----------', data);
    })
    .catch((err) => {
        console.log('---------- startServiceExtensionAbility fail, err:  -----------', err);
    })
  ```
## AbilityContext.startServiceExtensionAbilityWithAccount

startServiceExtensionAbilityWithAccount(want: Want, accountId: number, callback: AsyncCallback\<void>): void;

Starts a new Service Extension ability with the account ID specified. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability.|
| accountId | number | Yes| ID of a system account. For details, see [getCreatedOsAccountsCount](js-apis-osAccount.md#getosaccountlocalidfromprocess).|
| callback | AsyncCallback\<void\> | Yes| Callback used to return the result.|

**Example**

  ```js
  var want = {
    "deviceId": "",
    "bundleName": "com.extreme.test",
    "abilityName": "MainAbility"
  };
  var accountId = 100;
  this.context.startServiceExtensionAbilityWithAccount(want,accountId, (err) => {
    console.log('---------- startServiceExtensionAbilityWithAccount fail, err:  -----------', err);
  });
  ```

## AbilityContext.startServiceExtensionAbilityWithAccount

startServiceExtensionAbilityWithAccount(want: Want, accountId: number): Promise\<void>;

Starts a new Service Extension ability with the account ID specified. This API uses a promise to return the result.

**Required permissions**: ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability.|
| accountId | number | Yes| ID of a system account. For details, see [getCreatedOsAccountsCount](js-apis-osAccount.md#getosaccountlocalidfromprocess).|

**Example**

  ```js
  var want = {
    "deviceId": "",
    "bundleName": "com.extreme.test",
    "abilityName": "MainAbility"
  };
  var accountId = 100;
  this.context.startServiceExtensionAbilityWithAccount(want,accountId)
    .then((data) => {
        console.log('---------- startServiceExtensionAbilityWithAccount success, data:  -----------', data);
    })
    .catch((err) => {
        console.log('---------- startServiceExtensionAbilityWithAccount fail, err:  -----------', err);
    })
  ```
## AbilityContext.stopServiceExtensionAbility

stopServiceExtensionAbility(want: Want, callback: AsyncCallback\<void>): void;

Stops a Service Extension ability in the same application. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability.|
| callback | AsyncCallback\<void\> | Yes| Callback used to return the result.|

**Example**

  ```js
  var want = {
    "deviceId": "",
    "bundleName": "com.extreme.test",
    "abilityName": "MainAbility"
  };
  this.context.stopServiceExtensionAbility(want, (err) => {
    console.log('---------- stopServiceExtensionAbility fail, err:  -----------', err);
  });
  ```

## AbilityContext.stopServiceExtensionAbility

stopServiceExtensionAbility(want: Want): Promise\<void>;

Stops a Service Extension ability in the same application. This API uses a promise to return the result.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability.|

**Example**

  ```js
  var want = {
    "deviceId": "",
    "bundleName": "com.extreme.test",
    "abilityName": "MainAbility"
  };
  this.context.stopServiceExtensionAbility(want)
    .then((data) => {
        console.log('---------- stopServiceExtensionAbility success, data:  -----------', data);
    })
    .catch((err) => {
        console.log('---------- stopServiceExtensionAbility fail, err:  -----------', err);
    })
  ```

## AbilityContext.stopServiceExtensionAbilityWithAccount

stopServiceExtensionAbilityWithAccount(want: Want, accountId: number, callback: AsyncCallback\<void>): void;

Stops a Service Extension ability in the same application with the account ID specified. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability.|
| accountId | number | Yes| ID of a system account. For details, see [getCreatedOsAccountsCount](js-apis-osAccount.md#getosaccountlocalidfromprocess).|
| callback | AsyncCallback\<void\> | Yes| Callback used to return the result.|

**Example**

  ```js
  var want = {
    "deviceId": "",
    "bundleName": "com.extreme.test",
    "abilityName": "MainAbility"
  };
  var accountId = 100;
  this.context.stopServiceExtensionAbilityWithAccount(want,accountId, (err) => {
    console.log('---------- stopServiceExtensionAbilityWithAccount fail, err:  -----------', err);
  });
  ```

## AbilityContext.stopServiceExtensionAbilityWithAccount

stopServiceExtensionAbilityWithAccount(want: Want, accountId: number): Promise\<void>;

Stops a Service Extension ability in the same application with the account ID specified. This API uses a promise to return the result.

**Required permissions**: ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability.|
| accountId | number | Yes| ID of a system account. For details, see [getCreatedOsAccountsCount](js-apis-osAccount.md#getosaccountlocalidfromprocess).|

**Example**

  ```js
  var want = {
    "deviceId": "",
    "bundleName": "com.extreme.test",
    "abilityName": "MainAbility"
  };
  var accountId = 100;
  this.context.stopServiceExtensionAbilityWithAccount(want,accountId)
    .then((data) => {
        console.log('---------- stopServiceExtensionAbilityWithAccount success, data:  -----------', data);
    })
    .catch((err) => {
        console.log('---------- stopServiceExtensionAbilityWithAccount fail, err:  -----------', err);
    })
  ```

## AbilityContext.terminateSelf

terminateSelf(callback: AsyncCallback&lt;void&gt;): void;

Terminates this ability. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| callback | AsyncCallback&lt;void&gt; | Yes| Callback used to return the result.|

**Example**

  ```js
  this.context.terminateSelf((err) => {
      console.log('terminateSelf result:' + JSON.stringify(err));
  });
  ```


## AbilityContext.terminateSelf

terminateSelf(): Promise&lt;void&gt;;

Terminates this ability. This API uses a promise to return the result.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise used to return the result.|

**Example**

  ```js
  this.context.terminateSelf().then((data) => {
      console.log('success:' + JSON.stringify(data));
  }).catch((error) => {
      console.log('failed:' + JSON.stringify(error));
  });
  ```


## AbilityContext.terminateSelfWithResult

terminateSelfWithResult(parameter: AbilityResult, callback: AsyncCallback&lt;void&gt;): void;

Terminates this ability. This API uses an asynchronous callback to return the ability result information. It is used together with **startAbilityForResult**.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| parameter | [AbilityResult](js-apis-featureAbility.md#abilityresult) | Yes| Information returned to the caller.|
| callback | AsyncCallback&lt;void&gt; | Yes| Callback used to return the result.|

**Example**

  ```js
  var want = {
    "bundleName": "com.extreme.myapplication",
    "abilityName": "SecondAbility"
  }
  var resultCode = 100;
  // AbilityResult information returned to the caller.
  var abilityResult = {
    want,
    resultCode
  }
  this.context.terminateSelfWithResult(abilityResult, (error) => {
          console.log("terminateSelfWithResult is called = " + error.code)
      }
  );
  ```


## AbilityContext.terminateSelfWithResult

terminateSelfWithResult(parameter: AbilityResult): Promise&lt;void&gt;;

Terminates this ability. This API uses a promise to return the ability result information. It is used together with **startAbilityForResult**.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| parameter | [AbilityResult](js-apis-featureAbility.md#abilityresult) | Yes| Information returned to the caller.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise used to return the result.|

**Example**

  ```js
  var want = {
    "bundleName": "com.extreme.myapplication",
    "abilityName": "SecondAbility"
  }
  var resultCode = 100;
  // AbilityResult information returned to the caller.
  var abilityResult = {
    want,
    resultCode
  }
  this.context.terminateSelfWithResult(abilityResult).then((result) => {
      console.log("terminateSelfWithResult")
  }
  )
  ```

## AbilityContext.connectAbility

connectAbility(want: Want, options: ConnectOptions): number;

Uses the **AbilityInfo.AbilityType.SERVICE** template to connect this ability to another ability.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability.|
| options | [ConnectOptions](js-apis-featureAbility.md#connectoptions) | No| Parameters for the connection.|

**Return value**

| Type| Description|
| -------- | -------- |
| number | Result code of the ability connection.|

**Example**

  ```js
  var want = {
    "deviceId": "",
    "bundleName": "com.extreme.test",
    "abilityName": "MainAbility"
  };
  var options = {
    onConnect(elementName, remote) { console.log('----------- onConnect -----------') },
    onDisconnect(elementName) { console.log('----------- onDisconnect -----------') },
    onFailed(code) { console.log('----------- onFailed -----------') }
  }
  const result = this.context.connectAbility(want, options);
  console.log('----------- connectAbilityResult: ------------', result);
  ```


## AbilityContext.connectAbilityWithAccount

connectAbilityWithAccount(want: Want, accountId: number, options: ConnectOptions): number;

Uses the **AbilityInfo.AbilityType.SERVICE** template and account ID to connect this ability to another ability with the account ID specified.

**Required permissions**: ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability.|
| accountId | number | Yes| ID of a system account. For details, see [getCreatedOsAccountsCount](js-apis-osAccount.md#getosaccountlocalidfromprocess).|
| options | [ConnectOptions](js-apis-featureAbility.md#connectoptions) | No| Parameters for the connection.|

**Return value**

| Type| Description|
| -------- | -------- |
| number | Result code of the ability connection.|

**Example**

  ```js
  var want = {
    "deviceId": "",
    "bundleName": "com.extreme.test",
    "abilityName": "MainAbility"
  };
  var accountId = 100;
  var options = {
    onConnect(elementName, remote) { console.log('----------- onConnect -----------') },
    onDisconnect(elementName) { console.log('----------- onDisconnect -----------') },
    onFailed(code) { console.log('----------- onFailed -----------') }
  }
  const result = this.context.connectAbilityWithAccount(want, accountId, options);
  console.log('----------- connectAbilityResult: ------------', result);
  ```

## AbilityContext.disconnectAbility

disconnectAbility(connection: number): Promise\<void>;

Disconnects a connection. This API uses a promise to return the result.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| connection | number | Yes| Result code of the ability connection.|

**Return value**

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

**Example**
    
  ```js
  var connectionNumber = 0;
  this.context.disconnectAbility(connectionNumber).then((data) => {
       console.log('disconnectAbility success, data: ', data);
  }).catch((err) => {
       console.log('disconnectAbility fail, err: ', err);
  });
  ```

## AbilityContext.disconnectAbility

disconnectAbility(connection: number, callback:AsyncCallback\<void>): void;

Disconnects a connection. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| connection | number | Yes| Result code of the ability connection.|
| callback | AsyncCallback\<void> | Yes| Callback used to return the result.|

**Example**

  ```js
    var connectionNumber = 0;
    this.context.disconnectAbility(connectionNumber, (err) => {
       console.log('---------- disconnectAbility fail, err: -----------', err);
    });
  ```

## AbilityContext.startAbilityByCall

startAbilityByCall(want: Want): Promise&lt;Caller&gt;;

Obtains the caller interface of the specified ability, and if the specified ability is not started, starts the ability in the background.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability, including the ability name, bundle name, and device ID. If the device ID is left blank or the default value is used, it indicates the local device.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;Caller&gt; | Promise used to return the caller object to communicate with.|

**Example**
    
  ```js
  import Ability from '@ohos.application.Ability';
  var caller;
  export default class MainAbility extends Ability {
      onWindowStageCreate(windowStage) {
          this.context.startAbilityByCall({
              bundleName: "com.example.myservice",
              abilityName: "MainAbility",
              deviceId: ""
          }).then((obj) => {
              caller = obj;
              console.log('Caller GetCaller Get ' + caller);
          }).catch((e) => {
              console.log('Caller GetCaller error ' + e);
          });
      }
  }
  ```

## AbilityContext.startAbilityWithAccount

startAbilityWithAccount(want: Want, accountId: number, callback: AsyncCallback\<void\>): void;

Starts an ability with the account ID specified. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability.|
| accountId | number | Yes| ID of a system account. For details, see [getCreatedOsAccountsCount](js-apis-osAccount.md#getosaccountlocalidfromprocess).|
| callback | AsyncCallback\<void\> | Yes| Callback used to return the result.|

**Example**

  ```js
  var want = {
    "deviceId": "",
    "bundleName": "com.extreme.test",
    "abilityName": "MainAbility"
  };
  var accountId = 100;
  this.context.startAbilityWithAccount(want, accountId, (err) => {
    console.log('---------- startAbilityWithAccount fail, err:  -----------', err);
  });
  ```


## AbilityContext.startAbilityWithAccount

startAbilityWithAccount(want: Want, accountId: number, options: StartOptions, callback: AsyncCallback\<void\>): void;

Starts an ability with the account ID and start options specified. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability.|
| accountId | number | Yes| ID of a system account. For details, see [getCreatedOsAccountsCount](js-apis-osAccount.md#getosaccountlocalidfromprocess).|
| options | [StartOptions](js-apis-application-StartOptions.md) | No| Parameters used for starting the ability.|
| callback | AsyncCallback\<void\> | Yes| Callback used to return the result.|

**Example**

  ```js
  var want = {
    "deviceId": "",
    "bundleName": "com.extreme.test",
    "abilityName": "MainAbility"
  };
  var accountId = 100;
  var options = {
    windowMode: 0,
  };
  this.context.startAbilityWithAccount(want, accountId, options, (err) => {
    console.log('---------- startAbilityWithAccount fail, err:  -----------', err);
  });
  ```


## AbilityContext.startAbilityWithAccount

startAbilityWithAccount(want: Want, accountId: number, options?: StartOptions): Promise\<void\>;

Starts an ability with the account ID specified. This API uses a promise to return the result.

**Required permissions**: ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| want | [Want](js-apis-application-Want.md) | Yes| Information about the target ability.|
| accountId | number | Yes| ID of a system account. For details, see [getCreatedOsAccountsCount](js-apis-osAccount.md#getosaccountlocalidfromprocess).|
| options | [StartOptions](js-apis-application-StartOptions.md) | No| Parameters used for starting the ability.|

**Example**

  ```js
  var want = {
    "deviceId": "",
    "bundleName": "com.extreme.test",
    "abilityName": "MainAbility"
  };
  var accountId = 100;
  var options = {
    windowMode: 0,
  };
  this.context.startAbilityWithAccount(want, accountId, options)
    .then((data) => {
        console.log('---------- startAbilityWithAccount success, data:  -----------', data);
    })
    .catch((err) => {
        console.log('---------- startAbilityWithAccount fail, err:  -----------', err);
    })
  ```

## AbilityContext.requestPermissionsFromUser

requestPermissionsFromUser(permissions: Array&lt;string&gt;, requestCallback: AsyncCallback&lt;PermissionRequestResult&gt;) : void;

Requests permissions from the user by displaying a dialog box. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| permissions | Array&lt;string&gt; | Yes| Permissions to request.|
| callback | AsyncCallback&lt;[PermissionRequestResult](js-apis-permissionrequestresult.md)&gt; | Yes| Callback used to return the result.|

**Example**
    
  ```js
       var permissions=['com.example.permission']
       this.context.requestPermissionsFromUser(permissions,(result) => {
       console.log('requestPermissionsFromUserresult:' + JSON.stringify(result));
  });
  
  ```


## AbilityContext.requestPermissionsFromUser

requestPermissionsFromUser(permissions: Array&lt;string&gt;) : Promise&lt;PermissionRequestResult&gt;;

Requests permissions from the user by displaying a dialog box. This API uses a promise to return the result.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| permissions | Array&lt;string&gt; | Yes| Permissions to request.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;[PermissionRequestResult](js-apis-permissionrequestresult.md)&gt; | Promise used to return the result.|

**Example**
    
  ```js
   var permissions=['com.example.permission']
       this.context.requestPermissionsFromUser(permissions).then((data) => {
      console.log('success:' + JSON.stringify(data));
  }).catch((error) => {
      console.log('failed:' + JSON.stringify(error));
  });

  ```


## AbilityContext.setMissionLabel

setMissionLabel(label: string, callback:AsyncCallback&lt;void&gt;): void;

Sets a label for this ability in the mission. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| label | string | Yes| Label of the ability to set.|
| callback | AsyncCallback&lt;void&gt; | Yes| Callback used to return the result.|

**Example**
    
  ```js
  this.context.setMissionLabel("test",(result) => {
      console.log('requestPermissionsFromUserresult:' + JSON.stringify(result));
  });
  ```


## AbilityContext.setMissionLabel

setMissionLabel(label: string): Promise&lt;void&gt;

Sets a label for this ability in the mission. This API uses a promise to return the result.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| label | string | Yes| Label of the ability to set.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise used to return the result.|

**Example**
    
  ```js
  this.context.setMissionLabel("test").then((data) => {
      console.log('success:' + JSON.stringify(data));
  }).catch((error) => {
      console.log('failed:' + JSON.stringify(error));
  });
  ```
## AbilityContext.setMissionIcon

setMissionIcon(icon: image.PixelMap, callback:AsyncCallback\<void>): void;

Sets an icon for this ability in the mission. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| icon | image.PixelMap | Yes| Icon of the ability to set.|
| callback | AsyncCallback\<void> | Yes| Callback used to return the result.|

**Example**
    
  ```js
    import image from '@ohos.multimedia.image'
    var imagePixelMap;
    var color = new ArrayBuffer(0);
    var initializationOptions = {
       size: {
           height: 100,
           width: 100
       }
    };
    image.createPixelMap(color, initializationOptions)
       .then((data) => {
           imagePixelMap = data;
       })
       .catch((err) => {
           console.log('--------- createPixelMap fail, err: ---------', err)
       });
    this.context.setMissionIcon(imagePixelMap, (err) => {
       console.log('---------- setMissionIcon fail, err: -----------', err);
    })
  ```


## AbilityContext.setMissionIcon

setMissionIcon(icon: image.PixelMap): Promise\<void>;

Sets an icon for this ability in the mission. This API uses a promise to return the result.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**System API**: This is a system API and cannot be called by third-party applications.

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| icon | image.PixelMap | Yes| Icon of the ability to set.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise used to return the result.|

**Example**
    
  ```js
    import image from '@ohos.multimedia.image'
    var imagePixelMap;
    var color = new ArrayBuffer(0);
    var initializationOptions = {
      size: {
          height: 100,
          width: 100
      }
    };
    image.createPixelMap(color, initializationOptions)
      .then((data) => {
          imagePixelMap = data;
      })
      .catch((err) => {
          console.log('--------- createPixelMap fail, err: ---------', err)
      });
    this.context.setMissionIcon(imagePixelMap)
      .then((data) => {
          console.log('-------------- setMissionIcon success, data: -------------', data);
      })
      .catch((err) => {
          console.log('-------------- setMissionIcon fail, err: -------------', err);
      });
  ```
## AbilityContext.restoreWindowStage

restoreWindowStage(localStorage: LocalStorage) : void;

Restores the window stage data for this ability.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| localStorage | image.LocalStorage | Yes| Storage used to store the restored window stage.|

**Example**

  ```js
    var storage = new LocalStorage();
    this.context.restoreWindowStage(storage);
  ```

## AbilityContext.isTerminating

isTerminating(): boolean;

Checks whether this ability is in the terminating state.

**System capability**: SystemCapability.Ability.AbilityRuntime.Core

**Return value**

| Type| Description|
| -------- | -------- |
| boolean| The value **true** means that the ability is in the terminating state, and **false** means the opposite.|

**Example**

  ```js
  var isTerminating = this.context.isTerminating();
  console.log('ability state :' + isTerminating);
  ```