如何保存本地图片到相册中

let context: Context = getContext(this); 
// 获取待保存图像的ArrayBuffer 
const resourceMgr: resourceManager.ResourceManager = context.resourceManager; 
const fileData: Uint8Array = await resourceMgr.getRawFileContent('beer.jpeg'); 
const buffer = fileData.buffer; 
 
// 获取相册的保存路径 
let helper = photoAccessHelper.getPhotoAccessHelper(context); 
let uri = await helper.createAsset(photoAccessHelper.PhotoType.IMAGE, 'jpeg'); 
let file = await fs.open(uri, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE); 
 
// 写入文件并关闭文件流 
await fs.write(file.fd, buffer); 
await fs.close(file.fd);