#鸿蒙通关秘籍#在鸿蒙中如何订阅UIAbility的生命周期变化？

可以通过ApplicationContext提供的功能订阅UIAbility的生命周期变化。这样可以在UIAbility生命周期的特定阶段触发回调函数，如创建、背景、前台等。以下是使用示例：

javascript import { AbilityConstant, AbilityLifecycleCallback, UIAbility, Want } from '@kit.AbilityKit'; import { hilog } from '@kit.PerformanceAnalysisKit';

const TAG = '[LifecycleAbility]'; const DOMAIN_NUMBER = 0xFF00;

export default class LifecycleAbility extends UIAbility { lifecycleId = -1;

onCreate(want: Want, launchParam: AbilityConstant.LaunchParam) { let abilityLifecycleCallback = { onAbilityCreate(uiAbility) { hilog.info(DOMAIN_NUMBER, TAG, onAbilityCreate: ${JSON.stringify(uiAbility.launchWant)}); }, onAbilityDestroy(uiAbility) { hilog.info(DOMAIN_NUMBER, TAG, onAbilityDestroy: ${JSON.stringify(uiAbility.launchWant)}); } // 其他生命周期回调函数... };

let applicationContext = this.context.getApplicationContext();
try {
  this.lifecycleId = applicationContext.on('abilityLifecycle', abilityLifecycleCallback);
} catch (err) {
  console.error(`Failed to register lifecycle: ${err.message}`);
}

}

onDestroy() { let applicationContext = this.context.getApplicationContext(); try { applicationContext.off('abilityLifecycle', this.lifecycleId); } catch (err) { console.error(Failed to unregister lifecycle: ${err.message}); } } }