HarmonyOS 鸿蒙Next后台任务保活

长时任务请参考:https://developer.huawei.com/consumer/cn/doc/harmonyos-guides/continuous-task-0000001774280022

import backgroundTaskManager from '@ohos.resourceschedule.backgroundTaskManager';
import { BusinessError } from '@ohos.base';
import wantAgent, { WantAgent } from '@ohos.app.ability.wantAgent';

@Entry
@Component
struct Index {
 @State message: string = 'ContinuousTask';
 // 通过getContext方法，来获取page所在的UIAbility上下文。
 private context: Context = getContext(this);

 startContinuousTask(){
 let wantAgentInfo: wantAgent.WantAgentInfo = {
 // 点击通知后，将要执行的动作列表
 // 添加需要被拉起应用的bundleName和abilityName
 wants: [
 {
 bundleName:"com.example.longtaskdemo",
 abilityName:"com.example.longtaskdemo.EntryAbility"
 }
 ],
 //指定点击通知栏消息后的动作是拉起ability
 actionType: wantAgent.OperationType.START_ABILITY,
 // 使用者自定义的一个私有值
 requestCode: 0,
 // 点击通知后，动作执行属性
 wantAgentFlags: [wantAgent.WantAgentFlags.UPDATE_PRESENT_FLAG]
 };

 wantAgent.getWantAgent(wantAgentInfo)
 .then((wantAgentObj: WantAgent)=>{
 //backgroundTaskManager.BackgroundMode.AUDIO_PLAYBACK
 //backgroundTaskManager.BackgroundMode.LOCATION
 backgroundTaskManager.startBackgroundRunning(this.context, backgroundTaskManager.BackgroundMode.AUDIO_PLAYBACK,wantAgentObj)
 .then(()=>{
 console.info(`Succeeded in operationing startBackgroundRunning.`);
 })
 .catch((err: BusinessError) => {
 console.error(`Failed to operation startBackgroundRunning. Code is ${err.code}, message is ${err.message}`);
 });
 })
}

stopContinuousTask() {
 backgroundTaskManager.stopBackgroundRunning(this.context).then(() => {
 console.info(`Succeeded in operationing stopBackgroundRunning.`);
 }).catch((err: BusinessError) => {
 console.error(`Failed to operation stopBackgroundRunning. Code is ${err.code}, message is ${err.message}`);
 });
}

build() {
 Row() {
 Column() {
 Text("Index")
 .fontSize(50)
 .fontWeight(FontWeight.Bold)

 Button() {
 Text('申请长时任务').fontSize(25).fontWeight(FontWeight.Bold)
 }
 .type(ButtonType.Capsule)
 .margin({ top: 10 })
 .backgroundColor('#0D9FFB')
 .width(250)
 .height(40)
 .onClick(() => {
 // 通过按钮申请长时任务
 this.startContinuousTask();

 // 此处执行具体的长时任务逻辑，如放音等。
 })

 Button() {
 Text('取消长时任务').fontSize(25).fontWeight(FontWeight.Bold)
 }
 .type(ButtonType.Capsule)
 .margin({ top: 10 })
 .backgroundColor('#0D9FFB')
 .width(250)
 .height(40)
 .onClick(() => {
 // 此处结束具体的长时任务的执行

 // 通过按钮取消长时任务
 this.stopContinuousTask();
 })
 }
 .width('100%')
 }
 .height('100%')
}

但我并没有看到在长时任务里面重新执行播放逻辑，