對系統(tǒng)環(huán)境變化監(jiān)聽回調(diào)的能力

導(dǎo)入模塊

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

EnvironmentCallback.onConfigurationUpdated

onConfigurationUpdated(config: Configuration): void;

注冊系統(tǒng)環(huán)境變化的監(jiān)聽后，在系統(tǒng)環(huán)境變化時觸發(fā)回調(diào)。

系統(tǒng)能力：SystemCapability.Ability.AbilityRuntime.AbilityCore

參數(shù)：

EnvironmentCallback.onMemoryLevel

onMemoryLevel(level: AbilityConstant.MemoryLevel): void;

注冊系統(tǒng)環(huán)境變化的監(jiān)聽后，在系統(tǒng)內(nèi)存變化時觸發(fā)回調(diào)。

系統(tǒng)能力：SystemCapability.Ability.AbilityRuntime.AbilityCore

參數(shù)：

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.獲取applicationContext
      let applicationContext = globalThis.applicationContext;
      // 2.通過applicationContext注冊監(jiān)聽?wèi)?yīng)用內(nèi)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));
      });
  }
}