HarmonyOS 如何获取锁屏事件

参考demo：

import Base from '@ohos.base';
import CommonEventManager from '@ohos.commonEventManager';

let subscriber:CommonEventManager.CommonEventSubscriber; //用于保存创建成功的订阅者对象，后续使用其完成订阅及退订的动作

//订阅者信息
let subscribeInfo:CommonEventManager.CommonEventSubscribeInfo = {
  events: [CommonEventManager.Support.COMMON_EVENT_SCREEN_LOCKED, CommonEventManager.Support.COMMON_EVENT_SCREEN_UNLOCKED]
};

//发布公共事件回调
function subscribeCB(err:Base.BusinessError, data:CommonEventManager.CommonEventData) {
  if (err) {
    console.error(`publish failed, code is ${err.code}, message is ${err.message}`);
  } else {
    if (data.event == CommonEventManager.Support.COMMON_EVENT_SCREEN_LOCKED) {
      console.info("MWB ",`lock screen`);
    } else if (data.event == CommonEventManager.Support.COMMON_EVENT_SCREEN_UNLOCKED) {
      console.info("MWB ",`unlock screen`);
    }
  }
}


//创建订阅者回调
function createCB(err:Base.BusinessError, commonEventSubscriber:CommonEventManager.CommonEventSubscriber) {
  if(!err) {
    console.info("createSubscriber");
    subscriber = commonEventSubscriber;
    try {
      CommonEventManager.subscribe(subscriber, subscribeCB);
    } catch (error) {
      let err:Base.BusinessError = error as Base.BusinessError;
      console.error(`subscribe failed, code is ${err.code}, message is ${err.message}`);
    }
  } else {
    console.error(`createSubscriber failed, code is ${err.code}, message is ${err.message}`);
  }
}

//创建订阅者
try {
  CommonEventManager.createSubscriber(subscribeInfo, createCB);
} catch (error) {
  let err:Base.BusinessError = error as Base.BusinessError;
  console.error(`createSubscriber failed, code is ${err.code}, message is ${err.message}`);
}

@Entry
@Component
struct ScreenLockEventManageDemo {

  build() {
    Column() {
      Text('HELLO WORLD')
        .fontSize('20')
    }
    .width('100%')
    .height('100%')

  }
}

公共事件模块参考如下：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-commoneventmanager-V5

锁屏的公共事件定义：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/commonevent-screenlock-V5