HarmonyOS 如何从相册里选择图片作为头像并保存路径以便下次打开时还能显示？

choosePhoto() { 
  const photoSelectOptions = new picker.PhotoSelectOptions(); 
  photoSelectOptions.MIMEType = picker.PhotoViewMIMETypes.IMAGE_TYPE; // 过滤选择媒体文件类型为IMAGE 
  photoSelectOptions.maxSelectNumber = 1; // 选择媒体文件的最大数目 
  let uris: Array<string> = []; 
  const photoViewPicker = new picker.PhotoViewPicker(); 
  photoViewPicker.select(photoSelectOptions).then(async (photoSelectResult: picker.PhotoSelectResult) => { 
    uris = photoSelectResult.photoUris; 
    console.info('photoViewPicker.select to file succeed and uris are:' + uris); 
 
    let context = getContext(this) as common.UIAbilityContext; 
    let resFile = fs.openSync(uris[0], fs.OpenMode.READ_ONLY) 
    const dateStr = (new Date().getTime()).toString() 
    // 临时文件目录 
    let newPath = context.cacheDir + `/${dateStr + resFile.name}`; 
    // 转化路径 
    fs.copyFileSync(resFile.fd, newPath); 
    // 新的路径 
    let realUri = 'file://' + newPath; 
    //保存路径使用 
    this.avatarUri = realUri; 
 
  }).catch((err: BusinessError) => { 
    console.error(`Invoke photoViewPicker.select failed, code is ${err.code}, message is ${err.message}`); 
  }) 
}