在HarmonyOS鸿蒙Next的Stage模型中启动长时任务，任务启动成功，但没有文档中说的通知栏显示“正在xxx任务”通知

• ohos.permission.APPROXIMATELY_LOCATION // api9及以上，申请LOCATION必须同时申请该权限
• ohos.permission.LOCATION_IN_BACKGROUND // 后台定位
• ohos.permission.KEEP_BACKGROUND_RUNNING
• ohos.permission.LOCATION

我点击时调用、进入后台时自动调用都试过了，都是转入后台一会（大概5s）定位图标就不显示了，也不打印。

仔细对照了你的代码，除了bundleName，abilityName不一样，其他都一样的，包名与ability应该是没有写错的，如果写错了wantAgent.getWantAgent都启动不了的，服务也启动不了的，我的服务是启动成功了的。

我的设备是Mate40Pro，HarmonyOs 4.0.0.132，你的是系统版本是多少？

帮我看看我的问题在哪里呢

import common from '@ohos.app.ability.common';
import { Want } from '@ohos.app.ability.Want';
import { WantAgent, OperationType, WantAgentFlags } from '@ohos.app.ability.wantAgent';
import { backgroundTaskManager, BackgroundMode } from '@ohos.resourceschedule.backgroundTaskManager';
import { AbilityStage } from '@ohos.app.ability.AbilityStage';
import { geoLocationManager, LocationRequestScenario } from '@ohos.geoLocationManager';

export default class VoipContinueTask {
  message: string = 'VoipContinuousTask';
  private context: common.UIAbilityContext = getContext(this) as common.UIAbilityContext;
  constructor(context: common.UIAbilityContext) {
    this.context = context
    this.startContinuousTask();
  }
  startContinuousTask(): void {
    let wantAgentObj: WantAgent = null;
    let wantAgentInfo = {
      deviceId: '',
      wants: [
        {
          bundleName: "com.voip.test",
          abilityName: "com.voip.test.EntryAbility"
        }
      ],
      operationType: WantAgent.OperationType.START_ABILITY,
      requestCode: 0,
      wantAgentFlags: [WantAgent.WantAgentFlags.UPDATE_PRESENT_FLAG]
    };
    wantAgent.getWantAgent(wantAgentInfo).then((wantAgentObj) => {
      try {
        backgroundTaskManager.startBackgroundRunning(
          this.context,
          backgroundTaskManager.BackgroundMode.LOCATION,
          wantAgentObj).then(() => {
          console.info(`Succeeded in voip startBackgroundRunning.`);
          this.startLocation();
        }).catch((err) => {
          console.error(`Failed to operation voip startBackgroundRunning. Code is ${err.code}, message is ${err.message}`);
        });
      } catch (error) {
        console.error(`Failed to start background running. Code is ${error.code} message is ${error.message}`);
      }
    });
  }

  stopContinuousTask() :void{
    try {
      backgroundTaskManager.stopBackgroundRunning(this.context).then(() => {
        console.info(`Succeeded in operationing stopBackgroundRunning.`);
      }).catch((err) => {
        console.error(`Failed to operation stopBackgroundRunning. Code is ${err.code}, message is ${err.message}`);
      });
    } catch (error) {
      console.error(`Failed to stop background running. Code is ${error.code} message is ${error.message}`);
    }
  }
  startLocation(){
    let requestInfo = { 'scenario': geoLocationManager.LocationRequestScenario.NAVIGATION
    , 'timeInterval': 1
    , 'distanceInterval': 0
    , 'maxAccuracy': 0 };

    let locationChange = (location) => {
      console.log('--MyApp--locationChanger: data: ' + JSON.stringify(location));
    };
    try {
      geoLocationManager.on('locationChange', requestInfo, locationChange);
    } catch (err) {
      console.log('--MyApp--location.on:  error=' + err);
    }
  }
}

这个backgrounmode没有voip。。。。。先用location试试能不能后台长跑吧

调用的地方，从示例的chat项目改动过来

struct Index {
  @StorageLink('page_layout') page_layout: boolean | undefined = AppStorage.Get('page_layout'); // AppStorage中key对应的属性建立双向数据同步
  @State currentIndex: number = TAB_INDEX_0; // tabBar初始选中的位置
  @State message: Resource = $r('app.string.chat');
  private controller: TabsController = new TabsController();
  myVoip:VoipContinueTask=new VoipContinueTask(getContext() as common.UIAbilityContext);

  // 设置tabBar样式的位置、未选中图片、选中图片及文字显示的参数
  @Builder
  TabBuilder(index: number, imageNormal: Resource, imageSelected: Resource, text: Resource) {
    Column() {
      Divider()
        .vertical(false)
        .strokeWidth(DIVIDER_LINE_STROKWIDTH)
        .color($r('app.color.tab_bar_separator_line_color'))
        .opacity(TABBAR_SEPARATE_LINE)
      Image(this.currentIndex === index ? imageSelected : imageNormal)
        .syncLoad(true)
        .width($r('app.integer.tabbar_image_width'))
        .height($r('app.integer.tabbar_image_height'))
        .margin($r('app.integer.tabbar_image_margin'))
        .objectFit(ImageFit.Contain)
      Text(text)
        .fontSize($r('app.integer.tabbar_item_font_size'))
        .fontColor(this.currentIndex === index ?
        $r('app.color.tabbar_font_color_selected') : $r('app.color.tabbar_font_color_normal'));
    }
    .height($r('app.string.layout_100'))
    .width($r('app.string.layout_100'))
  }
}

类型

"backgroundModes": ["location"]

权限

"requestPermissions": [
      {
        "name": "ohos.permission.INTERNET",
        "reason": "$string:permission_internet",
        "usedScene": {
          "abilities": [
            "EntryAbility"
          ],
          "when": "inuse"
        }
      },
      {
        "name": "ohos.permission.KEEP_BACKGROUND_RUNNING",
        "reason" : "$string:PjsipService_desc",
        "usedScene": {
          "abilities": [
            "EntryAbility"
          ],
          "when": "always"
        }
      },
      {"name": "ohos.permission.APPROXIMATELY_LOCATION"},//api9及以上，申请LOCATION必须同时申请该权限
      {"name": "ohos.permission.LOCATION_IN_BACKGROUND"},//后台定位
      { "name": "ohos.permission.LOCATION"}
    ]

我需要的是程序一启动，voip的线程就要在后台长时间运行，目前这样它不报错，就是每次运行长时间任务都失败，然后报错如下，都还没到执行定位代码那段

BussinessError 9800006: Notification verification failed. The title or text of the notification cannot be empty.