鸿蒙开发接口Ability框架：【ApplicationContext】

本文主要是介绍鸿蒙开发接口Ability框架：【ApplicationContext】，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

ApplicationContext

ApplicationContext模块提供开发者应用级别的的上下文的能力，包括提供注册及取消注册应用内组件生命周期的监听接口。

说明：
开发前请熟悉鸿蒙开发指导文档： gitee.com/li-shizhen-skin/harmony-os/blob/master/README.md点击或者复制转到。
本模块首批接口从API version 9开始支持。后续版本的新增接口，采用上角标单独标记接口的起始版本。
本模块接口仅可在Stage模型下使用。

使用说明

在使用ApplicationContext的功能前，需要通过context的实例获取。

let applicationContext = this.context.getApplicationContext();

ApplicationContext.registerAbilityLifecycleCallback

registerAbilityLifecycleCallback(callback: AbilityLifecycleCallback): number;

注册监听应用内生命周期

系统能力：SystemCapability.Ability.AbilityRuntime.Core

参数：

参数名	类型	必填	说明
AbilityLifecycleCallback	callback	是	回调方法，返回注册监听事件的id

返回值：

类型	说明
number	返回的此次注册监听生命周期的id（每次注册该id会自增+1，当超过监听上限数量2^63-1时，返回-1）

示例：

import AbilityStage from "@ohos.application.AbilityStage";var lifecycleid;export default class MyAbilityStage extends AbilityStage {onCreate() {console.log("MyAbilityStage onCreate")let AbilityLifecycleCallback  =  {onAbilityCreate(ability){console.log("AbilityLifecycleCallback onAbilityCreate ability:" + JSON.stringify(ability));        },onAbilityWindowStageCreate(ability){console.log("AbilityLifecycleCallback onAbilityWindowStageCreate ability:" + JSON.stringify(ability));           },onAbilityWindowStageDestroy(ability){console.log("AbilityLifecycleCallback onAbilityWindowStageDestroy ability:" + JSON.stringify(ability));},onAbilityDestroy(ability){console.log("AbilityLifecycleCallback onAbilityDestroy ability:" + JSON.stringify(ability));             },onAbilityForeground(ability){console.log("AbilityLifecycleCallback onAbilityForeground ability:" + JSON.stringify(ability));             },onAbilityBackground(ability){console.log("AbilityLifecycleCallback onAbilityBackground ability:" + JSON.stringify(ability));              },onAbilityContinue(ability){console.log("AbilityLifecycleCallback onAbilityContinue ability:" + JSON.stringify(ability));}}// 1.通过context属性获取applicationContextlet applicationContext = this.context.getApplicationContext();// 2.通过applicationContext注册监听应用内生命周期lifecycleid = applicationContext.registerAbilityLifecycleCallback(AbilityLifecycleCallback);console.log("registerAbilityLifecycleCallback number: " + JSON.stringify(lifecycleid));       }onDestroy() {let applicationContext = this.context.getApplicationContext();applicationContext.unregisterAbilityLifecycleCallback(lifecycleid, (error, data) => {console.log("unregisterAbilityLifecycleCallback success, err: " + JSON.stringify(error));});}
}

ApplicationContext.unregisterAbilityLifecycleCallback

unregisterAbilityLifecycleCallback(callbackId: number, callback: AsyncCallback<void>): void;

取消监听应用内生命周期

系统能力：SystemCapability.Ability.AbilityRuntime.Core

参数：

参数名	类型	必填	说明
callbackId	number	是	注册监听应用内生命周期的id
AsyncCallback	callback	是	回调方法	`HarmonyOS与OpenHarmony鸿蒙文档籽料：mau123789是v直接拿`

搜狗高速浏览器截图20240326151547.png

示例：

let applicationContext = this.context.getApplicationContext();
let lifecycleid=1
console.log("stage applicationContext: " + JSON.stringify(applicationContext));
applicationContext.unregisterAbilityLifecycleCallback(lifecycleid, (error, data) => {console.log("unregisterAbilityLifecycleCallback success, err: " + JSON.stringify(error));
});