AbilityForegroundStateObserver (System API)

The AbilityForegroundStateObserver module defines the listener used to listen for ability foreground and background state changes.

NOTE

The initial APIs of this module are supported since API version 11. 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 abilityManager from '@ohos.app.ability.abilityManager';

Attributes

System capability: SystemCapability.Ability.AbilityRuntime.Core

Example

import abilityManager from '@ohos.app.ability.abilityManager';
import { BusinessError } from '@ohos.base';

let observer: abilityManager.AbilityForegroundStateObserver = {
    onAbilityStateChanged(abilityStateData) {
        console.log(`onAbilityStateChanged: ${JSON.stringify(abilityStateData)}`);
    },
};
try {
    abilityManager.on('abilityForegroundState', observer);
} catch (paramError) {
    let code = (paramError as BusinessError).code;
    let message = (paramError as BusinessError).message;
    console.error(`error: ${code}, ${message} `);
}