HarmonyOS 图片保存到相册

可以使用showAssetsCreationDialog方法，将需保存到媒体库中的图片/视频文件，先保存文件到应用沙箱，然后用这个方法将应用沙箱的文件保存到相册。参考文档是：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-photoaccesshelper-V5#showassetscreationdialog12

async saveImageToAlbum(path: string, title?: string, extension?: string): Promise<boolean> {
  return new Promise(async (resolve: Function, reject: Function) => {
  try {
  let phAccessHelper = photoAccessHelper.getPhotoAccessHelper(this.context)
  let srcFileUri: Array<string> = [fileUri.getUriFromPath(path)]
  console.debug(`图片 uri is : ${JSON.stringify(srcFileUri)}`)
let photoCreationConfigs: Array<photoAccessHelper.PhotoCreationConfig> = [
  {
    title: title ? title : '保存图片',
    fileNameExtension: extension ? extension : 'jpg',
    photoType: photoAccessHelper.PhotoType.IMAGE,
    subtype: photoAccessHelper.PhotoSubtype.DEFAULT
  }
]
let desFileUris: Array<string> = await phAccessHelper.showAssetsCreationDialog(srcFileUri, photoCreationConfigs)
console.debug(`目标图片 uri is : ${JSON.stringify(desFileUris)}`)
if (desFileUris.length > 0) {
  for (let index = 0; index < desFileUris.length; index++) {
    FileUtil.copyFileContentTo(srcFileUri[index], desFileUris[index])
  }
  resolve(true)
} else {
  resolve(false)
}
} catch (err) {
  reject(err)
}
})