1# ExtensionContext
2
3The **ExtensionContext** module, inherited from **Context**, implements the context for Extension abilities.
4
5This module provides APIs for accessing resources of a specific Extension ability. An Extension ability can use the context directly provided by **ExtensionContext** or that extended from **ExtensionContext**.
6
7> **NOTE**
8>
9>  - 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.
10>  - The APIs of this module can be used only in the stage model.
11
12## Modules to Import
13
14```ts
15import { common } from '@kit.AbilityKit';
16```
17
18## Attributes
19
20**Atomic service API**: This API can be used in atomic services since API version 11.
21
22**System capability**: SystemCapability.Ability.AbilityRuntime.Core
23
24| Name | Type | Readable | Writable | Description |
25| -------- | -------- | -------- | -------- | -------- |
26| currentHapModuleInfo | [HapModuleInfo](js-apis-bundleManager-hapModuleInfo.md) | Yes | No | Information about the HAP file.<br>(See **api\bundle\hapModuleInfo.d.ts** in the **SDK** directory.) |
27| config   | [Configuration](js-apis-app-ability-configuration.md) | Yes | No | Module configuration information.<br>(See **api\@ohos.app.ability.Configuration.d.ts** in the **SDK** directory.) |
28| extensionAbilityInfo | [ExtensionAbilityInfo](js-apis-bundleManager-extensionAbilityInfo.md) | Yes | No | Extension ability information.<br>(See **api\bundle\extensionAbilityInfo.d.ts** in the **SDK** directory.) |
29
30## When to Use
31**ExtensionContext** provides information about an Extension ability, module, and HAP file. You can use the information based on service requirements.
32
33**Example**
34
35```ts
36// Singleton object GlobalContext.ts
37export class GlobalContext {
38  private static instance: GlobalContext;
39  private _objects = new Map<string, Object>();
40
41  private constructor() {
42  }
43
44  public static getContext(): GlobalContext {
45    if (!GlobalContext.instance) {
46      GlobalContext.instance = new GlobalContext();
47    }
48    return GlobalContext.instance;
49  }
50
51  getObject(value: string): Object | undefined {
52    return this._objects.get(value);
53  }
54
55  setObject(key: string, objectClass: Object): void {
56    this._objects.set(key, objectClass);
57  }
58}
59```
60
61```ts
62import { FormExtensionAbility, formBindingData } from '@kit.FormKit';
63import { Want } from '@kit.AbilityKit';
64import { GlobalContext } from '../GlobalContext';
65
66export default class MyFormExtensionAbility extends FormExtensionAbility {
67  onAddForm(want: Want) {
68    console.log(`FormExtensionAbility onAddForm, want: ${want.abilityName}`);
69    let dataObj1: Record<string, string> = {
70      'temperature': '11c',
71      'time': '11:00'
72    };
73    GlobalContext.getContext().setObject("ExtensionContext", this.context);
74    let obj1: formBindingData.FormBindingData = formBindingData.createFormBindingData(dataObj1);
75    return obj1;
76  }
77};
78```
79