HarmonyOS录音音频如何存放，以及遍历

this.curFile = fileIo.openSync(this.filesDir + '/Audio_' + new Date().getTime() + '.mp4', fileIo.OpenMode.READ_WRITE | fileIo.OpenMode.CREATE);    
this.avConfig.url = 'fd://' + this.curFile.fd;

Scroll() { 
  List({ space: 5 }) { 
    ForEach(this.fileNames, (item: [string, number], index: number) => { 
      ListItem() { 
        Text(`${item[0]}  ${item[1]}s`) { 
          Span(`${item[0]}  `) 
          Span(`${item[1]}s`).fontColor(Color.Blue) 
        } 
        .backgroundColor('#f1f3f5') 
        .padding({ left: 20, right: 20, top: 8, bottom: 8 }) 
        .width('100%') 
        .borderRadius(15) 
        .borderWidth(1) 
        .borderColor(this.currentIndex == index ? Color.Blue : Color.Gray) 
      } 
      .onClick(() => { 
        this.isPlay = true; 
        this.currentIndex = index; 
        let file = fileIo.openSync(`${this.filesDir}/${item[0]}`) 
        this.curFileUri = `fd://${file.fd}`; 
        this.startPlayingProcess(); 
      }) 
    }) 
  } 
} 
.scrollBar(BarState.Off)