HarmonyOS 鸿蒙Next 各类系统监测是否允许蓝牙、通话、音量、语音电话、切屏、小窗等

可以试一下公共事件订阅这块的能力。目前有一些预留事件，暂未支持。支持范围文档如下： https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/common-event-overview-V5

开发指南如下： https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/common-event-subscription-V5

demo如下：

import CommonEventManager from '@ohos.commonEventManager';
import { BusinessError, commonEventManager } from '@kit.BasicServicesKit';

@Entry
@Component
struct Index {
  @State message: string = 'Hello World';
  aboutToAppear() {

    // 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
    let subscriber: commonEventManager.CommonEventSubscriber | null = null;
    // 订阅者信息
    let subscribeInfo: commonEventManager.CommonEventSubscribeInfo = {
      events: [
        'usual.event.CONNECTIVITY_CHANGE',
        //'usual.event.BATTERY_CHANGED',
        'usual.event.AIRPLANE_MODE'
      ],
    };

    // 创建订阅者回调
    commonEventManager.createSubscriber(subscribeInfo, (err: BusinessError, data: commonEventManager.CommonEventSubscriber) => {
      if (err) {
        console.error(`Failed to create subscriber. Code is ${err.code}, message is ${err.message}`);
        return;
      }
      console.info('Succeeded in creating subscriber.');
      subscriber = data;
      if (subscriber !== null) {
        commonEventManager.subscribe(subscriber, (err: BusinessError, data: commonEventManager.CommonEventData) => {
          if (err) {
            console.error(`Failed to subscribe common event. Code is ${err.code}, message is ${err.message}`);
            return;
          }
          console.debug('subscribe common event success:'+ JSON.stringify(data))
        })
      } else {
        console.error(`Need create subscriber`);
      }
    })

  }

  build() {
    Row() {
      Column() {
        Text(this.message)
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
      }
      .width('100%')
    }
    .height('100%')
  }
}