# @ohos.InputMethodExtensionContext (InputMethodExtensionContext)

InputMethodExtensionContext模块是InputMethodExtensionAbility的上下文环境，继承于ExtensionContext，提供InputMethodExtensionAbility具有的能力和接口，包括启动、停止、绑定、解绑Ability。

> **说明：**
>
> 本模块首批接口从API version 9开始支持。后续版本的新增接口，采用上角标单独标记接口的起始版本。
> 本模块接口仅可在Stage模型下使用。

## 导入模块

```ts
import { InputMethodExtensionContext } from '@kit.IMEKit';
```

## 使用说明

在使用InputMethodExtensionContext的功能前，需要通过InputMethodExtensionAbility子类实例获取。

```ts
import { InputMethodExtensionAbility } from '@kit.IMEKit';
import { Want } from '@kit.AbilityKit';
class InputMethodExtnAbility extends InputMethodExtensionAbility {
  onCreate(want: Want): void {
    let context = this.context;
  }
}
```

## InputMethodExtensionContext.destroy

destroy(callback: AsyncCallback<void>): void;

销毁输入法应用。使用callback异步回调。

**系统能力：** SystemCapability.MiscServices.InputMethodFramework

**参数：**

| 参数名   | 类型                 | 必填 | 说明                                                         |
| -------- | -------------------- | ---- | ------------------------------------------------------------ |
| callback | AsyncCallback\<void> | 是   | 回调函数。当销毁输入法应用成功时，err为undefined；否则为错误对象。 |

**示例：**

```ts
import { InputMethodExtensionAbility } from '@kit.IMEKit';
import { Want } from '@kit.AbilityKit';
import { BusinessError } from '@kit.BasicServicesKit';

class InputMethodExtnAbility extends InputMethodExtensionAbility {
  onCreate(want: Want): void {
    let context = this.context;
  }
  onDestroy() {
    this.context.destroy((err: BusinessError) => {
      if(err) {
        console.log(`Failed to destroy context, err code = ${err.code}`);
        return;
      }
      console.log('Succeeded in destroying context.');
    });
  }
}
```

## InputMethodExtensionContext.destroy

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

销毁输入法应用。使用Promise异步回调。

**系统能力：** SystemCapability.MiscServices.InputMethodFramework

**返回值：**

| 类型 | 说明 |
| -------- | -------- |
| Promise\<void> | 无返回结果的Promise对象。 |

**示例：**

```ts
import { InputMethodExtensionAbility } from '@kit.IMEKit';
import { Want } from '@kit.AbilityKit';
import { BusinessError } from '@kit.BasicServicesKit';

class InputMethodExtnAbility extends InputMethodExtensionAbility {
  onCreate(want: Want): void {
    let context = this.context;
  }
  onDestroy() {
    this.context.destroy().then(() => {
      console.log('Succeed in destroying context.');
    }).catch((err: BusinessError)=>{
      console.log(`Failed to destroy context, err code = ${err.code}`);
    });
  }
}
```

## InputMethodExtensionContext.startAbility<sup>12+</sup>

startAbility(want: Want): Promise&lt;void&gt;;

拉起目标应用。使用Promise异步回调。

**系统能力：** SystemCapability.MiscServices.InputMethodFramework

**参数：**

| 参数名 | 类型                                                    | 必填 | 说明                                                         |
| ------ | ------------------------------------------------------- | ---- | ------------------------------------------------------------ |
| want   | [Want](../apis-ability-kit/js-apis-app-ability-want.md) | 是   | 当前Extension相关的Want类型信息，包括ability名称、bundle名称等。 |

**返回值：**

| 类型           | 说明                      |
| -------------- | ------------------------- |
| Promise\<void> | 无返回结果的Promise对象。 |

**错误码：**

以下错误码的详细介绍请参见[输入法框架错误码](errorcode-inputmethod-framework.md)，[元能力错误码](../apis-ability-kit/errorcode-ability.md)，[通用错误码说明文档](../errorcode-universal.md)。

| 错误码ID | 错误信息                                                |
| -------- | ------------------------------------------------------- |
| 401      | parameter error. Possible causes: 1. Mandatory parameters are left unspecified; 2. Incorrect parameter types; 3. Parameter verification failed.           |
| 16000001 | The specified ability does not exist.                   |
| 16000002 | Incorrect ability type.                                 |
| 16000004 | Can not start invisible component.                      |
| 16000005 | The specified process does not have the permission.     |
| 16000006 | Cross-user operations are not allowed.                  |
| 16000008 | The crowdtesting application expires.                   |
| 16000009 | An ability cannot be started or stopped in Wukong mode. |
| 16000010 | The call with the continuation flag is forbidden.       |
| 16000011 | The context does not exist.                             |
| 16000012 | The application is controlled.                          |
| 16000013 | The application is controlled by EDM.                   |
| 16000019 | Can not match any component.                            |
| 16000050 | Internal error.                                         |
| 16000053 | The ability is not on the top of the UI.                |
| 16000055 | Installation-free timed out.                            |
| 16000061 | Can not start component belongs to other bundle.        |
| 16200001 | The caller has been released.                           |
| 16000069 | The extension cannot start the third party application. |
| 16000070 | The extension cannot start the service.                 |

**示例：**

```ts
import { InputMethodExtensionAbility } from '@kit.IMEKit';
import { Want } from '@kit.AbilityKit';
import { BusinessError } from '@kit.BasicServicesKit';

class InputMethodExtnAbility extends InputMethodExtensionAbility {
  onCreate(want: Want): void {
    let context = this.context;
  }
  onDestroy() {
    let want: Want = {
      bundleName: "com.example.aafwk.test",
      abilityName: "com.example.aafwk.test.TwoAbility"
    };
    try {
      this.context.startAbility(want).then(() => {
        console.log(`startAbility success`);
      }).catch((err: BusinessError) => {
        let error = err as BusinessError;
        console.log(`startAbility error: ${error.code} ${error.message}`);
      })
    } catch (err) {
      let error = err as BusinessError;
      console.log(`startAbility error: ${error.code} ${error.message}`);
    }
  }
}
```