**NOTE**:
*
It can be called only by the main thread.
*
**NOTE**:
*
It can be called only by the main thread.
*
**NOTE**:
*
It can be called only by the main thread.
*
**NOTE**:
*
It can be called only by the main thread.
*
**NOTE**:
*
It can be called only by the main thread.
*
**NOTE**:
*
It can be called only by the main thread.
*
**NOTE**:
*
It can be called only by the main thread.
*
**NOTE**:
*
It can be called only by the main thread.
*
A listener must have been registered by calling ApplicationContext.on('applicationStateChange').
*
ApplicationContext.on('applicationStateChange') or empty.
* - If a defined callback is passed in, the listener for that callback is unregistered.
* - If no value is passed in, all the listeners for the corresponding event are unregistered.
* @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Mandatory parameters are left unspecified.
* 2.Incorrect parameter types.
* @syscap SystemCapability.Ability.AbilityRuntime.Core
* @stagemodelonly
* @crossplatform
* @atomicservice
* @since 18
*/
off(type: 'applicationStateChange', callback?: ApplicationStateChangeCallback): void;
/**
* Get information about running processes
*
* @returns { Promise**NOTE**:
*
It can be called only by the main thread.
*
This API is used to forcibly exit an application in abnormal scenarios. To exit an application properly,
* call terminateSelf().
*
**NOTE**:
*
It can be called only by the main thread.
*
This API is used to forcibly exit an application in abnormal scenarios. To exit an application properly,
* call terminateSelf().
*
true means to clear
* the page stack, and false means the opposite.
* @returns { Promise**NOTE**:
*
It can be called only by the main thread.
*
This API is used to forcibly exit an application in abnormal scenarios. To exit an application properly,
* call terminateSelf().
*
err is undefined. Otherwise, err is an error object.
* @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Mandatory parameters are left unspecified.
* 2.Incorrect parameter types.
* @throws { BusinessError } 16000011 - The context does not exist.
* @syscap SystemCapability.Ability.AbilityRuntime.Core
* @stagemodelonly
* @atomicservice
* @since 11
*/
killAllProcesses(callback: AsyncCallback**NOTE**:
*
It can be called only by the main thread.
*
**NOTE**:
*
It can be called only by the main thread.
*
**NOTE**:
*
It can be called only by the main thread.
*
This API stops the application process. After the application process is stopped, all subsequent callbacks
* will not be triggered.
*
**NOTE**:
*
It can be called only by the main thread.
*
This API stops the application process. After the application process is stopped, all subsequent callbacks
* will not be triggered.
*
error is undefined; otherwise, error is an error object.
* @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Mandatory parameters are left unspecified.
* 2.Incorrect parameter types.
* @throws { BusinessError } 16000011 - The context does not exist.
* @throws { BusinessError } 16000050 - Internal error.
* @syscap SystemCapability.Ability.AbilityRuntime.Core
* @stagemodelonly
* @since arkts {'1.1':'11', '1.2':'20'}
* @arkts 1.1&1.2
*/
clearUpApplicationData(callback: AsyncCallback**NOTE**:
*
It can be called only by the main thread, and the application to restart must be active.
*
UIExtensionAbility instance is sent to the onCreate lifecycle of the
* UIExtensionAbility and waits to be loaded by the current application.
* A UIExtensionAbility instance can be preloaded for multiple times. Each time a preloaded
* UIExtensionAbility instance is loaded, the next preloaded UIExtensionAbility
* instance is sent to the onCreate lifecycle of the UIExtensionAbility.
*
* @permission ohos.permission.PRELOAD_UI_EXTENSION_ABILITY
* @param { Want } want - Want information of the UIExtensionAbility.
* @returns { Promise**NOTE**:
*
It can be called only by the main thread.
*
This API only sets the application to be ready for quick startup after caching. It does not mean that quick
* startup will be triggered. Other conditions must be considered to determine whether to trigger quick startup.
*
The process cache support status takes effect for a single application process instance. The setting does not
* affect other process instances. After a process instance is destroyed, the status is not retained and can be
* reset.
*
To support process cache, you must call this API, with true passed in, in the onCreate()
* lifecycle of all AbilityStages in the same process.
*
true means that
* process cache is supported, and false means the opposite.
* @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Mandatory parameters are left unspecified.
* 2.Incorrect parameter types.
* @throws { BusinessError } 801 - Capability not supported.
* @throws { BusinessError } 16000011 - The context does not exist.
* @throws { BusinessError } 16000050 - Internal error.
* @syscap SystemCapability.Ability.AbilityRuntime.Core
* @stagemodelonly
* @since arkts {'1.1':'12', '1.2':'20'}
* @arkts 1.1&1.2
*/
setSupportedProcessCache(isSupported : boolean): void;
/**
* Sets the font for this application.
*
* **NOTE**:
*
This API can be called only by the main thread.
*
**NOTE**:
*
It can be called only by the main thread.
*
followSystem and the value set here exceeds the value of
* fontSizeMaxScale, the value of fontSizeMaxScale takes effect.
* @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Mandatory parameters are left unspecified.
* @syscap SystemCapability.Ability.AbilityRuntime.Core
* @stagemodelonly
* @atomicservice
* @since arkts {'1.1':'13', '1.2':'20'}
* @arkts 1.1&1.2
*/
setFontSizeScale(fontSizeScale: number): void;
/**
* Obtains the unique instance ID of this application.
*
* **NOTE**:
*
It can be called only by the main thread.
*
This API is valid only for 2-in-1 devices.
*
**NOTE**:
*
It can be called only by the main thread.
*
This API is valid only for 2-in-1 devices.
*