[文章]HarmonyOS/OpenHarmony(Stage模型）卡片开发应用上下文Context使用场景二

3.创建其他应用或其他Module的Context
基类Context提供创建其他应用或其他Module的Context的方法为createModuleContext(moduleName:string)，创建其他应用或者其他Module的Context，从而通过该Context获取相应的资源信息（例如获取其他Module的获取应用开发路径信息）。
调用createModuleContext(moduleName:string)方法，获取本应用中其他Module的Context。获取到其他Module的Context之后，即可获取到相应Module的资源信息。

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

export default class EntryAbility extends UIAbility {
    onCreate(want, launchParam) {
        let moduleName2 = "module1";
        let context2 = this.context.createModuleContext(moduleName2);
        // ...
    }
}

4.订阅进程内Ability生命周期变化
在应用内的DFX统计场景，如需要统计对应页面停留时间和访问频率等信息，可以使用订阅进程内Ability生命周期变化功能。
在进程内Ability生命周期变化时，如创建、可见/不可见、获焦/失焦、销毁等，会触发进入相应的回调，其中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），以在UIAbilityContext中使用为例进行说明。

import UIAbility from '@ohos.app.ability.UIAbility';
import Window from '@ohos.window';

const TAG: string = "[Example].[Entry].[EntryAbility]";

export default class EntryAbility extends UIAbility {
    lifecycleId: number;

    onCreate(want, launchParam) {
        let abilityLifecycleCallback = {
            onAbilityCreate(ability) {
                console.info(TAG, "onAbilityCreate ability:" + JSON.stringify(ability));
            },
            onWindowStageCreate(ability, windowStage) {
                console.info(TAG, "onWindowStageCreate ability:" + JSON.stringify(ability));
                console.info(TAG, "onWindowStageCreate windowStage:" + JSON.stringify(windowStage));
            },
            onWindowStageActive(ability, windowStage) {
                console.info(TAG, "onWindowStageActive ability:" + JSON.stringify(ability));
                console.info(TAG, "onWindowStageActive windowStage:" + JSON.stringify(windowStage));
            },
            onWindowStageInactive(ability, windowStage) {
                console.info(TAG, "onWindowStageInactive ability:" + JSON.stringify(ability));
                console.info(TAG, "onWindowStageInactive windowStage:" + JSON.stringify(windowStage));
            },
            onWindowStageDestroy(ability, windowStage) {
                console.info(TAG, "onWindowStageDestroy ability:" + JSON.stringify(ability));
                console.info(TAG, "onWindowStageDestroy windowStage:" + JSON.stringify(windowStage));
            },
            onAbilityDestroy(ability) {
                console.info(TAG, "onAbilityDestroy ability:" + JSON.stringify(ability));
            },
            onAbilityForeground(ability) {
                console.info(TAG, "onAbilityForeground ability:" + JSON.stringify(ability));
            },
            onAbilityBackground(ability) {
                console.info(TAG, "onAbilityBackground ability:" + JSON.stringify(ability));
            },
            onAbilityContinue(ability) {
                console.info(TAG, "onAbilityContinue ability:" + JSON.stringify(ability));
            }
        }
        // 1. 通过context属性获取applicationContext
        let applicationContext = this.context.getApplicationContext();
        // 2. 通过applicationContext注册监听应用内生命周期
        this.lifecycleId = applicationContext.on("abilityLifecycle", abilityLifecycleCallback);
        console.info(TAG, "register callback number: " + JSON.stringify(this.lifecycleId));
    }

    onDestroy() {
        let applicationContext = this.context.getApplicationContext();
        applicationContext.off("abilityLifecycle", this.lifecycleId, (error, data) => {
            console.info(TAG, "unregister callback success, err: " + JSON.stringify(error));
        });
    }
}