HarmonyOS AVPlayer播放视频，退出页面后台播放时，视频会停止

onWindowStageCreate(windowStage: window.WindowStage): void { 
  // Main window is created, set main page for this ability 
  hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onWindowStageCreate'); 
  windowStage.loadContent('pages/Index', (err) => { 
  AppStorage.setOrCreate<boolean>('Video',true) 
  if (err.code) { 
  hilog.error(0x0000, 'testTag', 'Failed to load the content. Cause: %{public}s', JSON.stringify(err) ?? ''); 
  return; 
} 
hilog.info(0x0000, 'testTag', 'Succeeded in loading the content.'); 
}); 
} 
onForeground(): void { 
  // Ability has brought to foreground 
  hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onForeground'); 
  AppStorage.setOrCreate('Video',true) 
} 
onBackground(): void { 
  // Ability has back to background 
  hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onBackground'); 
  AppStorage.setOrCreate('Video',false) 
}
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@Entry 
@Component 
struct Index { 
  @State message: string = 'Hello World' 
  @StorageLink('Video') isOnForeground:boolean = true 
  build() { 
    Row() { 
      Column() { 
        Text(this.message) 
          .fontSize(50) 
          .fontWeight(FontWeight.Bold) 
        Vid({isOnForeground:this.isOnForeground}) 
      } 
      .width('100%') 
    } 
    .height('100%') 
  } 
} 
@Component 
struct Vid { 
  @Watch('change')@Link isOnForeground:boolean 
  @State message: string = 'Video' 
  build() { 
    Text("message") 
      .fontSize(50) 
      .fontWeight(FontWeight.Bold) 
      .onClick(()=>{ 
        this.message += this .isOnForeground 
        console.log(""+this.isOnForeground) 
      }) 
  } 
  change() { 
    if (this.isOnForeground) { 
      console.log('组件在前台') 
    } else { 
      console.log('组件在后台') 
    } 
  } 
}
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