# @ohos.application.appManager (appManager)

The **appManager** module implements application management. You can use the APIs of this module to query whether the application is undergoing a stability test, whether the application is running on a RAM constrained device, the memory size of the application, and information about the running process.

> **NOTE**
> 
> The APIs of this module are supported since API version 7 and deprecated since API version 9. You are advised to use [@ohos.app.ability.appManager](js-apis-app-ability-appManager.md) instead. Newly added APIs will be marked with a superscript to indicate their earliest API version.

## Modules to Import

```ts
import appManager from '@ohos.application.appManager';
```

## appManager.isRunningInStabilityTest<sup>8+</sup>

static isRunningInStabilityTest(callback: AsyncCallback&lt;boolean&gt;): void

Checks whether this application is undergoing a stability test. This API uses an asynchronous callback to return the result.

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

**Parameters**

  | Name| Type| Mandatory| Description| 
  | -------- | -------- | -------- | -------- |
  | callback | AsyncCallback&lt;boolean&gt; | Yes| Callback used to return the result. If the application is undergoing a stability test, **true** will be returned; otherwise, **false** will be returned.| 

**Example**
    
  ```ts
  appManager.isRunningInStabilityTest((error, flag) => {
    if (error && error.code !== 0) {
        console.error('isRunningInStabilityTest fail, error: ${JSON.stringify(error)}');
    } else {
        console.log('isRunningInStabilityTest success, the result is: ${JSON.stringify(flag)}');
    }
  });
  ```


## appManager.isRunningInStabilityTest<sup>8+</sup>

static isRunningInStabilityTest(): Promise&lt;boolean&gt;

Checks whether this application is undergoing a stability test. This API uses a promise to return the result.

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

**Return value**

  | Type| Description| 
  | -------- | -------- |
  | Promise&lt;boolean&gt; | Promise used to return the result. If the application is undergoing a stability test, **true** will be returned; otherwise, **false** will be returned.| 

**Example**
    
  ```ts
  appManager.isRunningInStabilityTest().then((flag) => {
      console.log('The result of isRunningInStabilityTest is: ${JSON.stringify(flag)}');
  }).catch((error) => {
      console.error('error: ${JSON.stringify(error)}');
  });
  ```


## appManager.isRamConstrainedDevice

isRamConstrainedDevice(): Promise\<boolean>;

Checks whether this application is running on a RAM constrained device. This API uses a promise to return the result.

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

**Return value**

  | Type| Description| 
  | -------- | -------- |
  | Promise&lt;boolean&gt; | Promise used to return whether the application is running on a RAM constrained device. If the application is running on a RAM constrained device, **true** will be returned; otherwise, **false** will be returned.| 

**Example**
    
  ```ts
  appManager.isRamConstrainedDevice().then((data) => {
      console.log('The result of isRamConstrainedDevice is: ${JSON.stringify(data)}');
  }).catch((error) => {
      console.error('error: ${JSON.stringify(error)}');
  });
  ```

## appManager.isRamConstrainedDevice

isRamConstrainedDevice(callback: AsyncCallback\<boolean>): void;

Checks whether this application is running on a RAM constrained device. This API uses an asynchronous callback to return the result.

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

**Parameters**

  | Name| Type| Mandatory| Description| 
  | -------- | -------- | -------- | -------- |
  | callback | AsyncCallback&lt;boolean&gt; | Yes| Callback used to return whether the application is running on a RAM constrained device. If the application is running on a RAM constrained device, **true** will be returned; otherwise, **false** will be returned.| 

**Example**
    
  ```ts
  appManager.isRamConstrainedDevice((error, data) => {
      if (error && error.code !== 0) {
          console.error('isRamConstrainedDevice fail, error: ${JSON.stringify(error)}');
      } else {
          console.log('The result of isRamConstrainedDevice is: ${JSON.stringify(data)}');
      }
  });
  ```

## appManager.getAppMemorySize

getAppMemorySize(): Promise\<number>;

Obtains the memory size of this application. This API uses a promise to return the result.

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

**Return value**

  | Type| Description| 
  | -------- | -------- |
  | Promise&lt;number&gt; | Promise used to return the memory size, in MB.| 

**Example**
    
  ```ts
  appManager.getAppMemorySize().then((data) => {
      console.log('The size of app memory is: ${JSON.stringify(data)}');
  }).catch((error) => {
      console.error('error: ${JSON.stringify(error)}');
  });
  ```

## appManager.getAppMemorySize

getAppMemorySize(callback: AsyncCallback\<number>): void;

Obtains the memory size of this application. This API uses an asynchronous callback to return the result.

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

**Parameters**

  | Name| Type| Mandatory| Description| 
  | -------- | -------- | -------- | -------- |
  | callback | AsyncCallback&lt;number&gt; | Yes| Callback used to return the memory size, in MB.| 

**Example**
    
  ```ts
  appManager.getAppMemorySize((error, data) => {
      if (error && error.code !== 0) {
          console.error('getAppMemorySize fail, error: ${JSON.stringify(error)}');
      } else {
          console.log('The size of app memory is: ${JSON.stringify(data)}');
      }
  });
  ```
## appManager.getProcessRunningInfos<sup>(deprecated)</sup>

getProcessRunningInfos(): Promise\<Array\<ProcessRunningInfo>>;

Obtains information about the running processes. This API uses a promise to return the result.

> This API is deprecated since API version 9. You are advised to use [appManager.getRunningProcessInformation<sup>9+</sup>](js-apis-app-ability-appManager.md#appmanagergetrunningprocessinformation) instead.

**Required permissions**: ohos.permission.GET_RUNNING_INFO

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

**Return value**

| Type| Description|
| -------- | -------- |
| Promise\<Array\<[ProcessRunningInfo](js-apis-inner-application-processRunningInfo.md)>> | Promise used to return the process information.|

**Example**
    
  ```ts
  appManager.getProcessRunningInfos().then((data) => {
      console.log('The process running infos is: ${JSON.stringify(data)}');
  }).catch((error) => {
      console.error('error: ${JSON.stringify(error)}');
  });
  ```

## appManager.getProcessRunningInfos<sup>(deprecated)</sup>

getProcessRunningInfos(callback: AsyncCallback\<Array\<ProcessRunningInfo>>): void;

Obtains information about the running processes. This API uses an asynchronous callback to return the result.

> This API is deprecated since API version 9. You are advised to use [appManager.getRunningProcessInformation<sup>9+</sup>](js-apis-app-ability-appManager.md#appmanagergetrunningprocessinformation9) instead.

**Required permissions**: ohos.permission.GET_RUNNING_INFO

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

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| callback | AsyncCallback\<Array\<[ProcessRunningInfo](js-apis-inner-application-processRunningInfo.md)>> | Yes| Obtains information about the running processes. This API uses a promise to return the result.|

**Example**
    
  ```ts
  appManager.getProcessRunningInfos((error, data) => {
      if (error && error.code !== 0) {
          console.error('getProcessRunningInfos fail, error: ${JSON.stringify(error)}');
      } else {
          console.log('getProcessRunningInfos success, data: ${JSON.stringify(data)}');
      }
  });
  ```

## appManager.registerApplicationStateObserver<sup>8+</sup>

registerApplicationStateObserver(observer: ApplicationStateObserver): number;

Registers an observer to listen for the state changes of all applications.

**Required permissions**: ohos.permission.RUNNING_STATE_OBSERVER

**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|
| -------- | -------- | -------- | -------- |
| observer | [ApplicationStateObserver](js-apis-inner-application-applicationStateObserver.md) | Yes| Numeric code of the observer.|

**Example**
    
  ```ts
  let applicationStateObserver = {
    onForegroundApplicationChanged(appStateData) {
        console.log('------------ onForegroundApplicationChanged -----------', appStateData);
    },
    onAbilityStateChanged(abilityStateData) {
        console.log('------------ onAbilityStateChanged -----------', abilityStateData);
    },
    onProcessCreated(processData) {
        console.log('------------ onProcessCreated -----------', processData);
    },
    onProcessDied(processData) {
        console.log('------------ onProcessDied -----------', processData);
    },
    onProcessStateChanged(processData) {
        console.log('------------ onProcessStateChanged -----------', processData);
    }
  };
  const observerCode = appManager.registerApplicationStateObserver(applicationStateObserver);
  console.log('-------- observerCode: ---------', observerCode);
  ```

## appManager.unregisterApplicationStateObserver<sup>8+</sup>

unregisterApplicationStateObserver(observerId: number,  callback: AsyncCallback\<void>): void;

Deregisters the application state observer. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.RUNNING_STATE_OBSERVER

**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|
| -------- | -------- | -------- | -------- |
| observerId | number | Yes| Numeric code of the observer.|
| callback | AsyncCallback\<void> | Yes| Callback used to return the result.|

**Example**
    
  ```ts
  let observerId = 100;

  function unregisterApplicationStateObserverCallback(err) {
    if (err) {
        console.error('------------ unregisterApplicationStateObserverCallback ------------', err);
    }
  }
  appManager.unregisterApplicationStateObserver(observerId, unregisterApplicationStateObserverCallback);
  ```

## appManager.unregisterApplicationStateObserver<sup>8+</sup>

unregisterApplicationStateObserver(observerId: number): Promise\<void>;

Deregisters the application state observer. This API uses a promise to return the result.

**Required permissions**: ohos.permission.RUNNING_STATE_OBSERVER

**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|
| -------- | -------- | -------- | -------- |
| observerId | number | Yes| Numeric code of the observer.|

**Return value**

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

**Example**
    
  ```ts
  let observerId = 100;

  appManager.unregisterApplicationStateObserver(observerId)
  .then((data) => {
      console.log('----------- unregisterApplicationStateObserver success ----------', data);
  })
  .catch((err) => {
      console.error('----------- unregisterApplicationStateObserver fail ----------', err);
  });
  ```

## appManager.getForegroundApplications<sup>8+</sup>

getForegroundApplications(callback: AsyncCallback\<Array\<AppStateData>>): void;

Obtains information about the applications that are running in the foreground. This API uses an asynchronous callback to return the result. The application information is defined by [AppStateData](js-apis-inner-application-appStateData.md).

**Required permissions**: ohos.permission.GET_RUNNING_INFO

**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|
| -------- | -------- | -------- | -------- |
| callback | AsyncCallback\<Array\<[AppStateData](js-apis-inner-application-appStateData.md)>> | Yes| Callback used to return the application information.|

**Example**
    
  ```ts
  function getForegroundApplicationsCallback(err, data) {
    if (err) {
        console.error('--------- getForegroundApplicationsCallback fail ---------', err);
    } else {
        console.log('--------- getForegroundApplicationsCallback success ---------', data);
    }
  }
  appManager.getForegroundApplications(getForegroundApplicationsCallback);
  ```

## appManager.getForegroundApplications<sup>8+</sup>

getForegroundApplications(): Promise\<Array\<AppStateData>>;

Obtains information about the applications that are running in the foreground. This API uses a promise to return the result. The application information is defined by [AppStateData](js-apis-inner-application-appStateData.md).

**Required permissions**: ohos.permission.GET_RUNNING_INFO

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

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

**Return value**

| Type| Description|
| -------- | -------- |
| Promise\<Array\<[AppStateData](js-apis-inner-application-appStateData.md)>> | Promise used to return the application information.|

**Example**
    
  ```ts
  appManager.getForegroundApplications()
  .then((data) => {
      console.log('--------- getForegroundApplications success -------', data);
  })
  .catch((err) => {
      console.error('--------- getForegroundApplications fail -------', err);
  });
  ```

## appManager.killProcessWithAccount<sup>8+</sup>

killProcessWithAccount(bundleName: string, accountId: number): Promise\<void\>

Kills a process by bundle name and account ID. This API uses a promise to return the result.

**Required permissions**: ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS (required only when the account ID is not the current user) and ohos.permission.CLEAN_BACKGROUND_PROCESSES

**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|
| -------- | -------- | -------- | -------- |
| bundleName | string | Yes| Bundle name.|
| accountId | number | Yes| ID of a system account. For details, see [getCreatedOsAccountsCount](js-apis-osAccount.md#getosaccountlocalidfromprocess).|

**Example**

```ts
let bundleName = 'bundleName';
let accountId = 0;
appManager.killProcessWithAccount(bundleName, accountId)
   .then((data) => {
       console.log('------------ killProcessWithAccount success ------------', data);
   })
   .catch((err) => {
       console.error('------------ killProcessWithAccount fail ------------', err);
   });
```


## appManager.killProcessWithAccount<sup>8+</sup>

killProcessWithAccount(bundleName: string, accountId: number, callback: AsyncCallback\<void\>): void

Kills a process by bundle name and account ID. 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.

**Required permissions**: ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS (required only when the account ID is not the current user) and ohos.permission.CLEAN_BACKGROUND_PROCESSES

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| bundleName | string | Yes| Bundle name.|
| 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**

```ts
let bundleName = 'bundleName';
let accountId = 0;
function killProcessWithAccountCallback(err, data) {
   if (err) {
       console.error('------------- killProcessWithAccountCallback fail, err: --------------', err);
   } else {
       console.log('------------- killProcessWithAccountCallback success, data: --------------', data);
   }
}
appManager.killProcessWithAccount(bundleName, accountId, killProcessWithAccountCallback);
```

## appManager.killProcessesByBundleName<sup>8+</sup>

killProcessesByBundleName(bundleName: string, callback: AsyncCallback\<void>);

Kills a process by bundle name. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.CLEAN_BACKGROUND_PROCESSES

**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|
| -------- | -------- | -------- | -------- |
| bundleName | string | Yes| Bundle name.|
| callback | AsyncCallback\<void> | Yes| Callback used to return the result.|

**Example**
    
  ```ts
  let bundleName = 'bundleName';
  function killProcessesByBundleNameCallback(err, data) {
    if (err) {
        console.error('------------- killProcessesByBundleNameCallback fail, err: --------------', err);
    } else {
        console.log('------------- killProcessesByBundleNameCallback success, data: --------------', data);
    }
  }
  appManager.killProcessesByBundleName(bundleName, killProcessesByBundleNameCallback);
  ```

## appManager.killProcessesByBundleName<sup>8+</sup>

killProcessesByBundleName(bundleName: string): Promise\<void>;

Kills a process by bundle name. This API uses a promise to return the result.

**Required permissions**: ohos.permission.CLEAN_BACKGROUND_PROCESSES

**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|
| -------- | -------- | -------- | -------- |
| bundleName | string | Yes| Bundle name.|

**Return value**

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

**Example**

  ```ts
  let bundleName = 'com.example.myapplication';
  appManager.killProcessesByBundleName(bundleName)
    .then((data) => {
        console.log('------------ killProcessesByBundleName success ------------', data);
    })
    .catch((err) => {
        console.error('------------ killProcessesByBundleName fail ------------', err);
    });
  ```

## appManager.clearUpApplicationData<sup>8+</sup>

clearUpApplicationData(bundleName: string, callback: AsyncCallback\<void>);

Clears application data by bundle name. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.CLEAN_APPLICATION_DATA

**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|
| -------- | -------- | -------- | -------- |
| bundleName | string | Yes| Bundle name.|
| callback | AsyncCallback\<void> | Yes| Callback used to return the result.|

**Example**
    
  ```ts
  let bundleName = 'bundleName';
  function clearUpApplicationDataCallback(err, data) {
    if (err) {
        console.error('------------- clearUpApplicationDataCallback fail, err: --------------', err);
    } else {
        console.log('------------- clearUpApplicationDataCallback success, data: --------------', data);
    }
  }
  appManager.clearUpApplicationData(bundleName, clearUpApplicationDataCallback);
  ```

## appManager.clearUpApplicationData<sup>8+</sup>

clearUpApplicationData(bundleName: string): Promise\<void>;

Clears application data by bundle name. This API uses a promise to return the result.

**Required permissions**: ohos.permission.CLEAN_APPLICATION_DATA

**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|
| -------- | -------- | -------- | -------- |
| bundleName | string | Yes| Bundle name.|

**Return value**

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

**Example**
    
  ```ts
  let bundleName = 'bundleName';
  appManager.clearUpApplicationData(bundleName)
    .then((data) => {
        console.log('------------ clearUpApplicationData success ------------', data);
    })
    .catch((err) => {
        console.error('------------ clearUpApplicationData fail ------------', err);
    });
  ```