# Context

> **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.

Provides the context for running code, including **applicationInfo** and **resourceManager**.

## Modules to Import
```
import AbilityContext from '@ohos.application.Ability';
```

## Usage

You must extend **AbilityContext** to implement this module.

## Attributes

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

  | Name| Type| Readable| Writable| Description|
| -------- | -------- | -------- | -------- | -------- |
| resourceManager | ResourceManager | Yes| No| **ResourceManager** object.|
| applicationInfo | ApplicationInfo | Yes| No| Information about the application.|
| cacheDir | string | Yes| No| Cache directory of the application on the internal storage.|
| tempDir | string | Yes| No| Temporary file directory of the application.|
| filesDir | string | Yes| No| File directory of the application on the internal storage.|
| databaseDir | string | Yes| No| Storage directory of local data.|
| storageDir | string | Yes| No| Storage directory of lightweight data.|
| bundleCodeDir | string | Yes| No| Application installation path.|
| distributedFilesDir | string | Yes| No| Storage directory of distributed application data files.|
| eventHub | [EventHub](js-apis-eventhub.md) | Yes| No| Event hub information.|
| area | [AreaMode](#areamode) | Yes| Yes| Area in which the file to be access is located.|


## Context.createBundleContext

createBundleContext(bundleName: string): Context;

Creates a context for a given application.

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

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | bundleName | string | Yes| Application bundle name.|

**Return value**

  | Type| Description|
  | -------- | -------- |
  | Context | Context created.|

**Example**

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

  ```


## Context.createModuleContext

createModuleContext(moduleName: string): Context;

Creates a context for a given HAP.

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

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | moduleName | string | Yes| HAP name in the application.|

**Return value**

  | Type| Description|
  | -------- | -------- |
  | Context | Context created.|

**Example**

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

  ```


## Context.createModuleContext

createModuleContext(bundleName: string, moduleName: string): Context;

Creates a context for a given HAP in an application.

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

**Parameters**

  | Name| Type| Mandatory| Description|
  | -------- | -------- | -------- | -------- |
  | bundleName | string | Yes| Application bundle name.|
  | moduleName | string | Yes| HAP name in the application.|

**Return value**

  | Type| Description|
  | -------- | -------- |
  | Context | Context created.|

**Example**

  ```js
  import AbilityContext from '@ohos.application.Ability'
      class MainAbility extends AbilityContext {
          onWindowStageCreate(windowStage) {
              let bundleName = "com.example.bundle";
              let moduleName = "module";
              let context = this.context.createModuleContext(bundleName, moduleName);
      }
}

  ```


## Context.getApplicationContext

getApplicationContext(): ApplicationContext;

Obtains the context of this application.

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

**Return value**

| Type| Description|
| -------- | -------- |
| ApplicationContext | Current application context.|

**Example**

  ```js
  // This part is mandatory.
  let applicationContext = this.context.getApplicationContext();
  ```


## AreaMode

Defines the area where the file to be access is located. Each area has its own content.

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

| Name           | Value   | Description           |
| --------------- | ---- | --------------- |
| EL1             | 0    | Device-level encryption area.  |
| EL2             | 1    | User credential encryption area. The default value is **EL2**.|