HarmonyOS鸿蒙Next中保存网络图片到相册

HarmonyOS鸿蒙Next中保存网络图片到相册

两步：

1、下载图片到本地

2、复制本地图片到相册（通过弹窗授权的方式保存到相册）

@Entry
@Component
struct saveToPhoto {
  private context: Context = getContext(this)
  private phAccessHelper = photoAccessHelper.getPhotoAccessHelper(this.context)
  pixelMap: PixelMap | undefined = undefined

  build() {
    Column() {
      Image('')
        .draggable(false)
        .gesture(
          LongPressGesture()
            .onAction(() => {
              this.dowImageAndSave('图片地址')
            })
        )
    }
  }

  dowImageAndSave(url: string) {
    let packOptions: image.PackingOption = { format: 'image/jpeg', quality: 98 }
    let imagePackerApi = image.createImagePacker()
    // 下载图片到本地
    http.createHttp().request(url, {
      method: http.RequestMethod.GET,
      connectTimeout: 60000,
      readTimeout: 60000
    }, async (error: BusinessError, data: http.HttpResponse) => {
      if (error) {
        console.log(`${error.code},${error.message}`)
      } else {
        let imageData: ArrayBuffer = data.result as ArrayBuffer
        let ImageSource: image.ImageSource = image.createImageSource(imageData)
        // 创建pixelmap对象
        this.pixelMap = await ImageSource.createPixelMap()

        const path: string = this.context.cacheDir + "/save_image.jpg"
        // 写入本地
        let file = fs.openSync(path, fs.OpenMode.CREATE | fs.OpenMode.READ_WRITE)
        await imagePackerApi.packToFile(this.pixelMap, file.fd, packOptions)

        // 获取图片uri
        let uri = fileUri.getUriFromPath(path)
        // 复制图片到相册
        try {
          let uris: Array<string> = [uri]
          let photoCreationConfig: Array<photoAccessHelper.PhotoCreationConfig> = [
            {
              title: 'dowImg',
              fileNameExtension: 'jpg',
              photoType: photoAccessHelper.PhotoType.IMAGE,
              subtype: photoAccessHelper.PhotoSubtype.DEFAULT
            }
          ]

          // 基于弹窗授权的方式获取媒体库的目标uri
          let desFileuris: Array<string> = await this.phAccessHelper.showAssetsCreationDialog(uris, photoCreationConfig)
          // 将应用沙箱的照片写入媒体库
          let desFile: fs.File = await fs.open(desFileuris[0], fs.OpenMode.WRITE_ONLY)  // 相册
          let srcFile: fs.File = await fs.open(uri, fs.OpenMode.READ_ONLY)    // 沙箱图片
          // 沙箱图片复制到相册
          await fs.copyFile(srcFile.fd, desFile.fd)
          fs.close(srcFile)
          fs.close(desFile)
        } catch (err) {
          console.log(`${err.code}, ${err.message}`)
        }
      }
    })
  }
}