HarmonyOS 鸿蒙Next createAsset创建的图片在图库中找不到

你写入的path是沙箱的路径吗，沙箱中的图片，图库是看不到的，需要使用安全保存控件SaveButton，或者拉起弹框保存api来保存图片，所以只涨了内存，图库看不到。下面的示例通过showAssetsCreationDialog来保存沙箱图片到图库中：

import { photoAccessHelper } from '@kit.MediaLibraryKit';
import { image } from '@kit.ImageKit';
import { resourceManager } from '@kit.LocalizationKit';
import { BusinessError } from '@kit.BasicServicesKit';
import { fileIo, fileUri } from '@kit.CoreFileKit';
import { promptAction } from '@kit.ArkUI';
let context = getContext(this);
let phAccessHelper = photoAccessHelper.getPhotoAccessHelper(context);
[@Entry](/user/Entry)
[@Component](/user/Component)
struct SaveImagePage {
  [@State](/user/State) message: string = 'Hello World';
  [@State](/user/State) pixelMap?: image.PixelMap = undefined
  async aboutToAppear(): Promise<void> {
    let decodingOptions: image.DecodingOptions = {
      editable: true,
      desiredPixelFormat: 3,
    }
    const rawFileDescriptor: resourceManager.RawFileDescriptor = await getContext(this).resourceManager.getRawFd('img.png');
    const imageSource: image.ImageSource = image.createImageSource(rawFileDescriptor);
    this.pixelMap = await imageSource.createPixelMap(decodingOptions)
  }
  build() {
    Column(){
      Image(this.pixelMap).width(200).height(200)
      Button('保存').onClick(async () =>{
        try {
          const imagePackerApi: image.ImagePacker = image.createImagePacker();
          let packOpts: image.PackingOption = { format: "image/jpeg", quality: 98 }
          let filePath = context.filesDir + "/" + Date().toString() + "_img.png"
          imagePackerApi.packing(this.pixelMap, packOpts, (err: BusinessError, data: ArrayBuffer) => {
            let file = fileIo.openSync(filePath,fileIo.OpenMode.CREATE | fileIo.OpenMode.READ_WRITE);
            fileIo.writeSync(file.fd,data)
          })
          let uri = fileUri.getUriFromPath(filePath);
          let srcFileUris: Array<string> = [
            uri // 实际场景请使用真实的uri
          ];
          let photoCreationConfigs: Array<photoAccessHelper.PhotoCreationConfig> = [
            {
              // title: 'test', // 可选
              fileNameExtension: 'png',
              photoType: photoAccessHelper.PhotoType.IMAGE,
              subtype: photoAccessHelper.PhotoSubtype.DEFAULT, // 可选
            }
          ];
          let desFileUris: Array<string> = await phAccessHelper.showAssetsCreationDialog(srcFileUris, photoCreationConfigs);
          let imageFile = fileIo.openSync(desFileUris[0],fileIo.OpenMode.CREATE | fileIo.OpenMode.READ_WRITE);
          await fileIo.copyFile(filePath,imageFile.fd,0).then(() =>{
            promptAction.showToast({
              message:"下载成功，已保存到相册"
            })
          })
          await fileIo.close(imageFile.fd)
          console.info('showAssetsCreationDialog success, data is ' + desFileUris);
        } catch (err) {
          console.error('showAssetsCreationDialog failed, errCode is ' + err.code + ', errMsg is ' + err.message);
        }
      })
    }
  }
} 

保存安全控件：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/ts-security-components-savebutton-V5
拉起弹框保存api：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-photoaccesshelper-V5#showassetscreationdialog12