HarmonyOS 鸿蒙Next showAssetsCreationDialog点击允许之后相册没有生成照片

请参考以下代码：

```
import { fileIo, fileUri } from '@kit.CoreFileKit';
import { BusinessError, request } from '@kit.BasicServicesKit';
import { photoAccessHelper } from '@kit.MediaLibraryKit';
import fs from '@ohos.file.fs';
import { image } from '@kit.ImageKit';
import { promptAction } from '@kit.ArkUI';
import { common } from '@kit.AbilityKit';
import { http } from '@kit.NetworkKit';
import ResponseCode from '@ohos.net.http';
@Entry
@Component
struct PictureSave {
@State message: string = ‘Hello World’;
@State imageBuffer: ArrayBuffer | undefined = undefined; // 图片ArrayBuffer
@State image: PixelMap | undefined = undefined;
@State photoAccessHelper: photoAccessHelper.PhotoAccessHelper | undefined = undefined;
async savePng() {
console.debug(image => 保存网络图片到应用沙盒)
const context = getContext(this);
let dirPath = context.cacheDir
let fileName = ‘temp2.jpg’
// let fileName = ‘temp1.mp4’
//防止沙箱重名导致下载失败
if (fileIo.accessSync(${dirPath}/${fileName})) {
fileIo.rmdirSync(${dirPath}/${fileName})
}
<span class="hljs-keyword">try</span> {
  request.downloadFile(context, {
    enableMetered: <span class="hljs-literal">true</span>,
    url: <span class="hljs-string">"http://gips0.baidu.com/it/u=3602773692,1512483864&amp;fm=3028&amp;app=3028&amp;f=JPEG&amp;fmt=auto?w=960&amp;h=1280"</span>,
    <span class="hljs-comment">// url: "http://vjs.zencdn.net/v/oceans.mp4",</span>
    filePath: `${dirPath}/${fileName}`
  }).then((downloadTask: request.DownloadTask) =&gt; {
    downloadTask.on(<span class="hljs-string">'fail'</span>, (err: number) =&gt; {
      console.error(`Failed to download the task. Code: ${err}`);
    });
    <span class="hljs-comment">// downloadTask.on('progress', (receivedSize: number, totalSize: number) =&gt; {</span>
    <span class="hljs-comment">//&nbsp;&nbsp; console.log('download', "receivedSize:" + (receivedSize / 1024) + " totalSize:" + (totalSize / 1024));</span>
    <span class="hljs-comment">// });</span>
    downloadTask.on(<span class="hljs-string">'complete'</span>, async () =&gt; {
      console.log(<span class="hljs-string">'下载完成'</span>)
    })
  }
  )
    .catch((err: BusinessError) =&gt; {
      console.error(`Invoke downloadTask failed, code is ${err.code}, message is ${err.message}`);
    });
  <span class="hljs-keyword">this</span>.saveImageToAlbum(`${dirPath}/${fileName}`)
} <span class="hljs-keyword">catch</span> (error) {
  <span class="hljs-keyword">let</span> err: BusinessError = error as BusinessError;
  console.error(`Invoke downloadFile failed, code is ${err.code}, message is ${err.message}`);
}
}
async saveImageToAlbum(path: string): Promise<boolean> {
return new Promise(async (resolve: Function, reject: Function) => {
try {
const context = getContext(this);
let phAccessHelper = photoAccessHelper.getPhotoAccessHelper(context)
let srcFileUri: Array<string> = [fileUri.getUriFromPath(path)]
console.debug(图片 uri is : ${<span class="hljs-built_in">JSON</span>.stringify(srcFileUri)})
let photoCreationConfigs: Array<photoAccessHelper.PhotoCreationConfig> = [
{
title: ‘保存图片’,
fileNameExtension: ‘jpg’,
// fileNameExtension: ‘mp4’,
photoType: photoAccessHelper.PhotoType.IMAGE,
// photoType: photoAccessHelper.PhotoType.VIDEO,
// subtype: photoAccessHelper.PhotoSubtype.DEFAULT
}
]
let desFileUris: Array<string> = await phAccessHelper.showAssetsCreationDialog(srcFileUri, photoCreationConfigs)
console.debug(目标图片 uri is : ${<span class="hljs-built_in">JSON</span>.stringify(desFileUris)})
if (desFileUris.length > 0) {
//文件拷贝
for (let index = 0; index < desFileUris.length; index++) {
let srcFile = fs.openSync(srcFileUri[index], fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE)
let destFile = fs.openSync(desFileUris[index], fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE)
fs.copyFileSync(srcFile.fd, destFile.fd)
fs.closeSync(srcFile);
fs.closeSync(destFile);
}
resolve(true)
} else {
resolve(false)
}
} catch (err) {
reject(err)
}
})
}
build() {
RelativeContainer() {
Column() {
Button(‘保存图片视频到相册’)
.onClick(() => {
this.savePng()
})
}
.height(‘100%’)
.width(‘100%’)
.alignItems(HorizontalAlign.Center)
.justifyContent(FlexAlign.Center)
}
}
}