HarmonyOS 鸿蒙Next 在使用photoHelper.showAssetsCreationDialog保存图片时无法显示预览图的问题

沙箱文件保存到相册

import { common } from '@kit.AbilityKit';
import { fileIo as fs, fileUri, ReadOptions, WriteOptions } from '@kit.CoreFileKit'
import { photoAccessHelper } from '@kit.MediaLibraryKit';
import json from '@ohos.util.json';

@Entry
@Component
struct Index {
  @State message: string = 'Hello World';

  filePath: string = '';

  build() {
    Column() {
      Button('沙箱文件保存到相册')
        .onClick(async () => {
          let context1 = getContext(this) as common.UIAbilityContext;
          let pathDir = context1.filesDir; // 应用通用文件路径
          let filePath = pathDir + '/hello.jpg'
          let arrayBuff = context1.resourceManager.getMediaContentSync($r('app.media.hello')).buffer
          let file = fs.openSync(filePath, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
          fs.writeSync(file.fd, arrayBuff)
          fs.closeSync(file);
          let dstPath = pathDir + "/hello.jpg";
          this.filePath = await fileUri.getUriFromPath(dstPath) //获取沙箱完整路径
          this.syncToSysAlbum(photoAccessHelper.PhotoType.IMAGE, 'png', this.filePath)
        })
    }
    .height('100%')
    .width('100%')
  }

  async syncToSysAlbum(fileType: photoAccessHelper.PhotoType, extension: string, ...filePath: string[]) {
    let context = getContext(this);
    let phAccessHelper = photoAccessHelper.getPhotoAccessHelper(context);
    try {
      const srcFileUris: string[] = []
      filePath.forEach((path) => {
        srcFileUris.push(path)
      })
      const config: photoAccessHelper.PhotoCreationConfig[] = []
      config.push({
        title: 'background', // 可选
        fileNameExtension: extension,
        photoType: fileType,
      })
      console.log("syncToSysAlarm fileUri:" + json.stringify(srcFileUris) + ",config:" + json.stringify(config))

      const desFileUris = await phAccessHelper.showAssetsCreationDialog(srcFileUris, config)

      console.debug(`目标图片 uri is : ${JSON.stringify(desFileUris)}`)

      if (desFileUris.length > 0) {
        for (let index = 0; index < desFileUris.length; index++) {
          this.copyFileContentTo(srcFileUris[index], desFileUris[index])
        }
      }
    } catch (err) {
      console.log("syncToSysAlarm filePath:" + filePath + ",error:" + json.stringify(err))
    }
  }

  copyFileContentTo(srcFilePath: string, destFilePath: string) {
    let srcFile = fs.openSync(srcFilePath, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE)
    let destFile = fs.openSync(destFilePath, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE)

    // 读取源文件内容并写入至目的文件
    let bufSize = 4096;
    let readSize = 0;
    let buf = new ArrayBuffer(bufSize);
    let readOptions: ReadOptions = {
      offset: readSize,
      length: bufSize
    };
    let readLen = fs.readSync(srcFile.fd, buf, readOptions);
    while (readLen > 0) {
      readSize += readLen;
      let writeOptions: WriteOptions = {
        length: readLen
      };
      fs.writeSync(destFile.fd, buf, writeOptions);
      readOptions.offset = readSize;
      readLen = fs.readSync(srcFile.fd, buf, readOptions);
    }
    // 关闭文件
    fs.closeSync(srcFile);
    fs.closeSync(destFile);
  }
}