对系统环境变化监听回调的能力

导入模块

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

EnvironmentCallback.onConfigurationUpdated

onConfigurationUpdated(config: Configuration): void;

注册系统环境变化的监听后，在系统环境变化时触发回调。

系统能力：SystemCapability.Ability.AbilityRuntime.AbilityCore

参数：

EnvironmentCallback.onMemoryLevel

onMemoryLevel(level: AbilityConstant.MemoryLevel): void;

注册系统环境变化的监听后，在系统内存变化时触发回调。

系统能力：SystemCapability.Ability.AbilityRuntime.AbilityCore

参数：

示例：

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

let callbackId;

export default class MyAbility extends UIAbility {
  onCreate() {
      console.log('MyAbility onCreate');
      globalThis.applicationContext = this.context.getApplicationContext();
      let EnvironmentCallback  =  {
          onConfigurationUpdated(config){
              console.log('onConfigurationUpdated config:' + JSON.stringify(config));
          },
          onMemoryLevel(level){
              console.log('onMemoryLevel level: ${JSON.stringify(level)}');
          }
      };
      // 1.获取applicationContext
      let applicationContext = globalThis.applicationContext;
      // 2.通过applicationContext注册监听应用内生命周期
      callbackId = applicationContext.registerEnvironmentCallback(EnvironmentCallback);
      console.log('registerEnvironmentCallback number: ' + JSON.stringify(callbackId));
  }
  onDestroy() {
      let applicationContext = globalThis.applicationContext;
      applicationContext.unregisterEnvironmentCallback(callbackId, (error, data) => {
          console.log('unregisterEnvironmentCallback success, err: ' + JSON.stringify(error));
      });
  }
}