The **Context** module provides all level-2 module APIs for developers to export.
> **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.
The **ExtensionAbility** module manages the ExtensionAbility lifecycle and context, such as creating and destroying an ExtensionAbility, and dumping client information.
> **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.
Called when the system has decided to adjust the memory level. For example, this API can be used when there is not enough memory to run as many background processes as possible.
| level | [AbilityConstant.MemoryLevel](js-apis-application-abilityConstant.md#abilityconstantmemorylevel) | Yes| Memory level that indicates the memory usage status. When the specified memory level is reached, a callback will be invoked and the system will start adjustment.|
The **distributedBundle** module provides APIs for managing distributed bundles.
> **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 provided by this module are system APIs.
## Modules to Import
```
import distributedBundle from '@ohos.bundle.distributedBundle';
| callback | AsyncCallback<[RemoteAbilityInfo](js-apis-bundleManager-remoteAbilityInfo.md)> | Yes | Callback used to return the result. If the operation is successful, **err** is **null** and **data** is the **RemoteAbilityInfo** object obtained. Otherwise, **err** is an error object.|
**Error codes**
For details about the error codes, see [Bundle Error Codes](../errorcodes/errorcode-bundle.md).
| elementNames | Array<[ElementName](js-apis-bundleManager-elementName.md)> | Yes | **ElementName** array, whose maximum length is 10. |
| callback | AsyncCallback\<Array\<[RemoteAbilityInfo](js-apis-bundleManager-remoteAbilityInfo.md)>> | Yes | Callback used to return the result. If the operation is successful, **err** is **null** and **data** is the array of **RemoteAbilityInfo** objects obtained. Otherwise, **err** is an error object.|
**Error codes**
For details about the error codes, see [Bundle Error Codes](../errorcodes/errorcode-bundle.md).
| ID| Error Message |
|----------|-------------------------|
| 17700001 | The specified bundle name is not found. |
| 17700003 | The specified ability name is not found. |
| 17700007 | The specified device ID is not found. |
| 17700027 | The distributed service is not running. |
| Promise\<Array<[RemoteAbilityInfo](js-apis-bundleManager-remoteAbilityInfo.md)>> | Promise used to return the array of **RemoteAbilityInfo** objects obtained.|
**Error codes**
For details about the error codes, see [Bundle Error Codes](../errorcodes/errorcode-bundle.md).
| ID| Error Message |
|----------|-------------------------|
| 17700001 | The specified bundle name is not found. |
| 17700003 | The specified ability name is not found. |
| 17700007 | The specified device ID is not found. |
| 17700027 | The distributed service is not running. |
Obtains information about the remote ability that matches the given element name and locale. This API uses an asynchronous callback to return the result.
| callback | AsyncCallback<[RemoteAbilityInfo](js-apis-bundleManager-remoteAbilityInfo.md)> | Yes | Callback used to return the result. If the operation is successful, **err** is **null** and **data** is the **RemoteAbilityInfo** object obtained. Otherwise, **err** is an error object.|
**Error codes**
For details about the error codes, see [Bundle Error Codes](../errorcodes/errorcode-bundle.md).
| ID| Error Message |
|----------|-------------------------|
| 17700001 | The specified bundle name is not found. |
| 17700003 | The specified ability name is not found. |
| 17700007 | The specified device ID is not found. |
| 17700027 | The distributed service is not running. |
Obtains information about remote abilities that match the given element names and locales. This API uses an asynchronous callback to return the result.
| elementNames | Array<[ElementName](js-apis-bundleManager-elementName.md)> | Yes | **ElementName** array, whose maximum length is 10. |
| locale | string |Yes| Target locale.|
| callback | AsyncCallback\<Array\<[RemoteAbilityInfo](js-apis-bundleManager-remoteAbilityInfo.md)>> | Yes | Callback used to return the result. If the operation is successful, **err** is **null** and **data** is the array of **RemoteAbilityInfo** objects obtained. Otherwise, **err** is an error object.|
**Error codes**
For details about the error codes, see [Bundle Error Codes](../errorcodes/errorcode-bundle.md).
| ID | Error Message |
|---------------|-------------------------|
| 17700001 | The specified bundle name is not found. |
| 17700003 | The specified ability name is not found. |
| 17700007 | The specified device ID is not found. |
| 17700027 | The distributed service is not running. |
| Promise\<Array<[RemoteAbilityInfo](js-apis-bundleManager-remoteAbilityInfo.md)>> | Promise used to return the array of **RemoteAbilityInfo** objects obtained.|
**Error codes**
For details about the error codes, see [Bundle Error Codes](../errorcodes/errorcode-bundle.md).
| ID| Error Message |
|----------|-------------------------|
| 17700001 | The specified bundle name is not found. |
| 17700003 | The specified ability name is not found. |
| 17700007 | The specified device ID is not found. |
| 17700027 | The distributed service is not running. |
The **Environment** module provides APIs for obtaining the root directories of the storage and public files.
> **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.
> - The APIs of this module are system APIs and cannot be called by third-party applications.
## Modules to Import
```js
importenvironmentfrom'@ohos.environment';
```
## environment.getStorageDataDir
getStorageDataDir():Promise<string>
Obtains the root directory of the storage. This API uses a promise to return the result.
The **secuityLabel** module provides APIs to manage file data security levels, including obtaining and setting file data security levels.
> **NOTE**<br/>
> 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.
## Modules to Import
```js
importsecurityLabelfrom'@ohos.securityLabel';
```
## Usage
Before using the APIs provided by this module to perform operations on a file or directory, obtain the path of the application sandbox as follows:
The **workScheduler** module provides the APIs for registering, canceling, and querying Work Scheduler tasks, which do not have real-time constraints.
The system executes Work Scheduler tasks at an appropriate time, subject to the storage space, power consumption, temperature, and more.
> **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.
> - For details about the constraints on the Work Scheduler usage, see [Work Scheduler Overview](../../task-management/work-scheduler-overview.md).
## Modules to Import
```js
importworkSchedulerfrom'@ohos.workScheduler';
```
## workScheduler.startWork
startWork(work: WorkInfo): boolean
Instructs the **WorkSchedulerService** to add the specified task to the execution queue.
| callback | AsyncCallback\<[WorkInfo](#workinfo)> | Yes | Callback used to return the result. Returns the task status obtained from the **WorkSchedulerService** if the specified task ID is valid; returns **null** otherwise.|
| Promise\<[WorkInfo](#workinfo)> | Promise used to return the result. Returns the task status obtained from the **WorkSchedulerService** if the specified task ID is valid; returns **null** otherwise.|
**Example**
```js
workScheduler.getWorkStatus(50).then((res)=>{
for(letiteminres){
console.info(`workschedulerLog getWorkStatus success, ${item} is: ${res[item]}`);
| callback | AsyncCallback\<void> | Yes | Callback used to return the result. Returns **true** if the last execution of the specified task timed out; returns **false** otherwise.|
| Promise\<boolean> | Promise used to return the result. Returns **true** if the last execution of the specified task timed out; returns **false** otherwise.|
**Example**
```js
workScheduler.isLastWorkTimeOut(500)
.then(res=>{
console.info(`workschedulerLog isLastWorkTimeOut success, data is: ${res}`);
Provides detailed information about the task. For details about the constraints on configuring **WorkInfo**, see [Work Scheduler Overview](../../task-management/work-scheduler-overview.md).
@@ -152,7 +152,7 @@ Inherit from **workAbility** and implement the lifecycle callbacks for the WorkS
Import the module.
```ts
import { workAbility } from '@ohos/library'
import { workAbility } from '@ohos/library';
```
Add the **Upgrade** button, which, when being clicked, will call the API encapsulated in **library** to start the Work Scheduler task. In the API, **bundleName** and **abilityName** are passed in, where the value of **abilityName** is **WorkTest**.
...
...
@@ -163,7 +163,7 @@ Inherit from **workAbility** and implement the lifecycle callbacks for the WorkS
