鸿蒙 NEXT 开发中，使用公共事件进行进程间通信 原创

import { BusinessError, commonEventManager } from '@ohos.BasicServicesKit';
import { hilog } from '@ohos.PerformanceAnalysisKit';
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const TAG: string = 'PowerSavingApp';
const DOMAIN_NUMBER: number = 0xFF00;
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let subscriber: commonEventManager.CommonEventSubscriber | null = null;
let subscribeInfo: commonEventManager.CommonEventSubscribeInfo = {
  events: ['device.battery.low'], // 订阅电量低事件
};
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commonEventManager.createSubscriber(subscribeInfo, (err: BusinessError, data: commonEventManager.CommonEventSubscriber) => {
  if (err) {
    hilog.error(DOMAIN_NUMBER, TAG, `Failed to create subscriber. Code is ${err.code}, message is ${err.message}`);
    return;
  }
  hilog.info(DOMAIN_NUMBER, TAG, 'Succeeded in creating subscriber.');
  subscriber = data;
});
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if (subscriber !== null) {
  commonEventManager.subscribe(subscriber, (err: BusinessError, data: commonEventManager.CommonEventData) => {
    if (err) {
      hilog.error(DOMAIN_NUMBER, TAG, `Failed to subscribe common event. Code is ${err.code}, message is ${err.message}`);
      return;
    }
    handleLowBatteryEvent(data);
  });
} else {
  hilog.error(DOMAIN_NUMBER, TAG, `Need to create subscriber`);
}
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function handleLowBatteryEvent(data: commonEventManager.CommonEventData) {
  hilog.info(DOMAIN_NUMBER, TAG, `Received low battery event. Taking power saving measures.`);
  // 这里可以添加降低功耗的具体操作，例如关闭后台任务、降低屏幕亮度等
}
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let options: commonEventManager.CommonEventPublishData = {
  code: 1,
  data: 'Manual power saving triggered',
};
commonEventManager.publish('device.battery.low', options, (err: BusinessError) => {
  if (err) {
    hilog.error(DOMAIN_NUMBER, TAG, 'PublishCallBack err = ' + JSON.stringify(err));
  } else {
    hilog.info(DOMAIN_NUMBER, TAG, 'Publish success');
  }
});
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