HarmonyOS 鸿蒙Next中Notification Kit（用户通知服务）如何使用sound自定义提示音

HarmonyOS 鸿蒙Next中Notification Kit（用户通知服务）如何使用sound自定义提示音 【问题描述】：我按照官网文档尝试了，但是一直都是默认的提示音，这个sound该怎么用啊，能给我一个可行的demo吗？这个代码是官网的示例，我修改了一下

【问题现象】：设置了sound也是默认的提示音，这个sound提示是一个string

【版本信息】：6.0.0(20)

【复现代码】：

import { notificationManager } from '@kit.NotificationKit';
import { BusinessError } from '@kit.BasicServicesKit';
import { common } from '@kit.AbilityKit';
import { PromptAction } from '@kit.ArkUI';

const TAG: string = '[PublishOperation]';
const DOMAIN_NUMBER: number = 0xFF00;

@Entry
@Component
struct NotificationPage {
  uiContext: UIContext = this.getUIContext();
  promptAction: PromptAction = this.uiContext.getPromptAction();

  // 获取用户授权
  requestForNotification() {
    let context = this.getUIContext().getHostContext() as common.UIAbilityContext;
    notificationManager.isNotificationEnabled().then((data: boolean) => {
      console.info(`${DOMAIN_NUMBER}, ${TAG}, isNotificationEnabled success, data: ${data}`);
      if (!data) {
        notificationManager.requestEnableNotification(context).then(() => {
          this.promptAction.openToast({
            message: '请求通知授权成功',
            duration: 2000,
          });
          console.info(`${DOMAIN_NUMBER}, ${TAG}, [ANS] requestEnableNotification success`);
        }).catch((err: BusinessError) => {
          if (1600004 == err.code) {
            this.promptAction.openToast({
              message: '请求通知授权失败',
              duration: 2000,
            });
            console.error(`${DOMAIN_NUMBER}, ${TAG},
              [ANS] requestEnableNotification refused, code is ${err.code}, message is ${err.message}`);
          } else {
            console.error(`${DOMAIN_NUMBER}, ${TAG},
              [ANS] requestEnableNotification failed, code is ${err.code}, message is ${err.message}`);
          }
        });
      }
    }).catch((err: BusinessError) => {
      console.error(`${DOMAIN_NUMBER}, ${TAG}, isNotificationEnabled fail, code is ${err.code}, message is ${err.message}`);
    });
  }

  // 构造NotificationRequest对象，发布通知
  notification(title: string, message: string) {
    let notificationRequest: notificationManager.NotificationRequest = {
      id: 1,
      content: {
        notificationContentType: notificationManager.ContentType.NOTIFICATION_CONTENT_BASIC_TEXT,
        normal: {
          title: "test_title",
          text: "test_text",
          additionalText: "test_additionalText"
        }
      },
      notificationSlotType: notificationManager.SlotType.SOCIAL_COMMUNICATION,
      sound: 'sound.mp3'
    };
    notificationManager.publish(notificationRequest, (err: BusinessError) => {
      if (err) {
        console.error(`${DOMAIN_NUMBER}, ${TAG}, Failed to publish notification. Code is ${err.code}, message is ${err.message}`);
        this.promptAction.openToast({
          message: '请求通知授权成功',
          duration: 2000,
        });
        return;
      } else {
        console.info(`${DOMAIN_NUMBER}, ${TAG}, Succeeded in publishing notification.`);
        this.promptAction.openToast({
          message: '发布通知成功',
          duration: 2000,
        });
      }
    });
  }

  // 获取二次授权
  openNotification(){
    let context = this.getUIContext().getHostContext() as common.UIAbilityContext;
    notificationManager.isNotificationEnabled().then((data: boolean) => {
      console.info(`${DOMAIN_NUMBER}, ${TAG}, "isNotificationEnabled success, data:${data} `);
      if(!data){
        notificationManager.openNotificationSettings(context).then(() => {
          console.info(`${DOMAIN_NUMBER}, ${TAG}, [ANS] openNotificationSettings success`);
        }).catch((err: BusinessError) => {
          console.error(`${DOMAIN_NUMBER}, ${TAG}, [ANS] openNotificationSettings failed, code is ${err.code}, message is ${err.message}`);
        });
      }
    }).catch((err: BusinessError) => {
      console.error(`${DOMAIN_NUMBER}, ${TAG}, isNotificationEnabled fail, code is ${err.code}, message is ${err.message}`);
    });
  }

  aboutToAppear(): void {
    this.requestForNotification();
    this.openNotification();
  }

  build() {
    Column() {
      Button('发布通知').onClick(() => {
        let title = '这是一个标题';
        let message = '这是一条通知';
        this.notification(title, message);
      });
    }
    .width('100%')
    .height('100%')
    .justifyContent(FlexAlign.Center);
  }
}