@ohos.app.ability.abilityLifecycleCallback (AbilityLifecycleCallback)

The AbilityLifecycleCallback module defines the callbacks to receive lifecycle changes of ApplicationContext. The callbacks include onAbilityCreate, onWindowStageCreate, onWindowStageActive, onWindowStageInactive, onWindowStageDestroy, onAbilityDestroy, onAbilityForeground, onAbilityBackground, and onAbilityContinue.

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 AbilityLifecycleCallback from '@ohos.app.ability.AbilityLifecycleCallback';

AbilityLifecycleCallback.onAbilityCreate

onAbilityCreate(ability: UIAbility): void;

Called when an ability is created.

System capability: SystemCapability.Ability.AbilityRuntime.AbilityCore

Parameters

Example

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

let abilityLifecycleCallback: AbilityLifecycleCallback =  {
    onAbilityCreate(ability){
        console.log('AbilityLifecycleCallback onAbilityCreate.');  
    }
};

AbilityLifecycleCallback.onWindowStageCreate

onWindowStageCreate(ability: UIAbility, windowStage: window.WindowStage): void;

Called when the window stage of an ability is created.

System capability: SystemCapability.Ability.AbilityRuntime.AbilityCore

Parameters

Example

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

let abilityLifecycleCallback: AbilityLifecycleCallback =  {
    onWindowStageCreate(ability, windowStage){
        console.log('AbilityLifecycleCallback onWindowStageCreate.');
    }
};

AbilityLifecycleCallback.onWindowStageActive

onWindowStageActive(ability: UIAbility, windowStage: window.WindowStage): void;

Called when the window stage of an ability gains focus.

System capability: SystemCapability.Ability.AbilityRuntime.AbilityCore

Parameters

Example

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

let abilityLifecycleCallback: AbilityLifecycleCallback =  {
    onWindowStageActive(ability, windowStage){
        console.log('AbilityLifecycleCallback onWindowStageActive.');
    }
};

AbilityLifecycleCallback.onWindowStageInactive

onWindowStageInactive(ability: UIAbility, windowStage: window.WindowStage): void;

Called when the window stage of an ability loses focus.

System capability: SystemCapability.Ability.AbilityRuntime.AbilityCore

Parameters

Example

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

let abilityLifecycleCallback: AbilityLifecycleCallback =  {
    onWindowStageInactive(ability, windowStage){
        console.log('AbilityLifecycleCallback onWindowStageInactive.');
    }
};

AbilityLifecycleCallback.onWindowStageDestroy

onWindowStageDestroy(ability: UIAbility, windowStage: window.WindowStage): void;

Called when the window stage of an ability is destroyed.

System capability: SystemCapability.Ability.AbilityRuntime.AbilityCore

Parameters

Example

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

let abilityLifecycleCallback: AbilityLifecycleCallback =  {
    onWindowStageDestroy(ability, windowStage){
        console.log('AbilityLifecycleCallback onWindowStageDestroy.');
    }
};

AbilityLifecycleCallback.onAbilityDestroy

onAbilityDestroy(ability: UIAbility): void;

Called when an ability is destroyed.

System capability: SystemCapability.Ability.AbilityRuntime.AbilityCore

Parameters

Example

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

let abilityLifecycleCallback: AbilityLifecycleCallback =  {
    onAbilityDestroy(ability){
        console.log('AbilityLifecycleCallback onAbilityDestroy.');
    }
};

AbilityLifecycleCallback.onAbilityForeground

onAbilityForeground(ability: UIAbility): void;

Called when an ability is switched from the background to the foreground.

System capability: SystemCapability.Ability.AbilityRuntime.AbilityCore

Parameters

Example

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

let abilityLifecycleCallback: AbilityLifecycleCallback =  {
    onAbilityForeground(ability){
        console.log('AbilityLifecycleCallback onAbilityForeground.');
    }
};

AbilityLifecycleCallback.onAbilityBackground

onAbilityBackground(ability: UIAbility): void;

Called when an ability is switched from the foreground to the background.

System capability: SystemCapability.Ability.AbilityRuntime.AbilityCore

Parameters

Example

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

let abilityLifecycleCallback: AbilityLifecycleCallback =  {
    onAbilityBackground(ability){
        console.log('AbilityLifecycleCallback onAbilityBackground.');
    }
};

AbilityLifecycleCallback.onAbilityContinue

onAbilityContinue(ability: UIAbility): void;

Called when an ability is continued on another device.

System capability: SystemCapability.Ability.AbilityRuntime.AbilityCore

Parameters

Example

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

let abilityLifecycleCallback: AbilityLifecycleCallback =  {
    onAbilityContinue(ability){
        console.log('AbilityLifecycleCallback onAbilityContinue.');
    }
};

Usage of AbilityLifecycleCallback

Example GlobalContext.ts

// Construct a singleton object.
export class GlobalContext {
  private constructor() {}
  private static instance: GlobalContext;
  private _objects = new Map<string, Object>();

  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }

  getObject(value: string): Object|undefined {
    return this._objects.get(value);
  }

  setObject(key: string, objectClass: Object): void {
    this._objects.set(key, objectClass);
  }
}

MyFirstAbility.ts

import AbilityLifecycleCallback from '@ohos.app.ability.AbilityLifecycleCallback';
import AbilityStage from '@ohos.app.ability.AbilityStage';
import UIAbility from '@ohos.app.ability.UIAbility';
import { GlobalContext } from '../GlobalContext'

// Declare the ability lifecycle callbacks. A listener can be registered in applicationContext only after all the callbacks are configured.
let abilityLifecycleCallback: AbilityLifecycleCallback = {
    onAbilityCreate(ability){
        console.log('AbilityLifecycleCallback onAbilityCreate.');  
    },
    onWindowStageCreate(ability, windowStage){
        console.log('AbilityLifecycleCallback onWindowStageCreate.');
    },
    onWindowStageActive(ability, windowStage){
        console.log('AbilityLifecycleCallback onWindowStageActive.');
    },
    onWindowStageInactive(ability, windowStage){
        console.log('AbilityLifecycleCallback onWindowStageInactive.');
    },
    onWindowStageDestroy(ability, windowStage){
        console.log('AbilityLifecycleCallback onWindowStageDestroy.');
    },
    onAbilityDestroy(ability){
        console.log('AbilityLifecycleCallback onAbilityDestroy.');
    },
    onAbilityForeground(ability){
        console.log('AbilityLifecycleCallback onAbilityForeground.');
    },
    onAbilityBackground(ability){
        console.log('AbilityLifecycleCallback onAbilityBackground.');
    },
    onAbilityContinue(ability){
        console.log('AbilityLifecycleCallback onAbilityContinue.');
    }
};

export default class MyFirstAbility extends UIAbility {
    onCreate() {
        console.log('MyAbilityStage onCreate');
        // 1. Obtain applicationContext through the context attribute.
        let applicationContext = this.context.getApplicationContext();
        // 2. Register the listener for the ability lifecycle changes through the applicationContext object.
        try {
            let lifecycleId = applicationContext.on('abilityLifecycle', abilityLifecycleCallback);
            GlobalContext.getContext().setObject("lifecycleId", lifecycleId);
            console.log(`registerAbilityLifecycleCallback lifecycleId: ${globalThis.lifecycleId}`);
        } catch (paramError) {
            console.error(`error: ${paramError.code}, ${paramError.message}`);
        }
    }
}

MySecondAbility.ts

import UIAbility from '@ohos.app.ability.UIAbility';
import { GlobalContext } from '../GlobalContext'

export default class MySecondAbility extends UIAbility {
    onDestroy() {
        let applicationContext = this.context.getApplicationContext();
        let lifecycleId = GlobalContext.getContext().getObject("lifecycleId") as number;
        // 3. Deregister the listener for the ability lifecycle changes through the applicationContext object.
        applicationContext.off('abilityLifecycle', lifecycleId, (error) => {
            if (error && error.code !== 0) {
                console.error(`unregisterAbilityLifecycleCallback fail, error: ${JSON.stringify(error)}`);
            } else {
                console.log('unregisterAbilityLifecycleCallback success.');
            }
        });
    }
}

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