harmony 鸿蒙@ohos.app.ability.Ability (Ability Base Class)

2022-12-22
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@ohos.app.ability.Ability (Ability Base Class)

This is the base class of UIAbility and ExtensionAbility. It provides the callbacks for system configuration updates and memory level updates. You cannot inherit from this base class.

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.

Modules to Import

import Ability from '@ohos.app.ability.Ability';

Ability.onConfigurationUpdate

onConfigurationUpdate(newConfig: Configuration): void;

Called when the configuration of the environment where the ability is running is updated.

System capability: SystemCapability.Ability.AbilityRuntime.AbilityCore

Parameters

Name	Type	Mandatory	Description
newConfig	Configuration	Yes	New configuration.

Example

// You are not allowed to inherit from the top-level base class Ability. Therefore, the derived class UIAbility is used as an example.
import UIAbility from '@ohos.app.ability.UIAbility';
import { Configuration } from '@ohos.app.ability.Configuration';

class MyUIAbility extends UIAbility {
    onConfigurationUpdate(config: Configuration) {
        console.log(`onConfigurationUpdate, config: ${JSON.stringify(config)}`);
    }
}

Ability.onMemoryLevel

onMemoryLevel(level: AbilityConstant.MemoryLevel): void;

Called when the system adjusts the memory level.

System capability: SystemCapability.Ability.AbilityRuntime.AbilityCore

Parameters

Name	Type	Mandatory	Description
level	AbilityConstant.MemoryLevel	Yes	New memory level.

Example

// You are not allowed to inherit from the top-level base class Ability. Therefore, the derived class UIAbility is used as an example.
import UIAbility from '@ohos.app.ability.UIAbility';
import AbilityConstant from '@ohos.app.ability.AbilityConstant';

class MyUIAbility extends UIAbility {
    onMemoryLevel(level: AbilityConstant.MemoryLevel) {
        console.log(`onMemoryLevel, level: ${JSON.stringify(level)}`);
    } 
}