鸿蒙Next如何实现打开相册选图片功能？ 原创

// 导入选择器模块和文件管理模块
import {  zipImageUtil} from '../utils/ZipImageUtil'
import { photoAccessHelper } from '@kit.MediaLibraryKit';
import { image } from '@kit.ImageKit';
import { fileIo as fs } from '@kit.CoreFileKit';
import {  buffer as Buffer} from '@kit.ArkTS';
 // 拉起相册，选择图片方法
class getPhotofromAlbum{
    getAlbum: string = '显示相册中的图片';
    pixel: image.PixelMap | undefined = undefined;
    albumPath: string = '';
    photoSize: number = 0;
    async initData():Promise<string>{
        try{
        //创建图片-音频类型文件选择选项实例
        let PhotoSelectOptions = new photoAccessHelper.PhotoSelectOptions(); 
        PhotoSelectOptions.MIMEType = photoAccessHelper.PhotoViewMIMETypes.IMAGE_TYPE;
        PhotoSelectOptions.maxSelectNumber = 1; // 最多选择数量
       
        //创建图库选择器实例，调用PhotoViewPicker.select接口拉起图库界面进行文件选择。文件选择成功后，返回PhotoSelectResult结果集。
       let photoPicker = new photoAccessHelper.PhotoViewPicker(); 
      let photoSelectResult: photoAccessHelper.PhotoSelectResult = await photoPicker.select(PhotoSelectOptions);
        this.albumPath = photoSelectResult.photoUris[0];  //获得到选择图片的文件路径

        // 使用file解析文件，并读取图片为buffer
       const file = fs.openSync(this.albumPath, fs.OpenMode.READ_ONLY);
       this.photoSize = fs.statSync(file.fd).size;
       console.info('Photo Size: ' + this.photoSize);
       let buffer = new ArrayBuffer(this.photoSize);
       fs.readSync(file.fd, buffer);
       fs.closeSync(file);

        // 解码成PixelMap
       const imageSource = image.createImageSource(buffer);
       console.log('imageSource: ' + JSON.stringify(imageSource));
       let pixelMap = await imageSource.createPixelMap({});

       //设置打包参数
       const imagePackerApi = image.createImagePacker();
       const packOpts: image.PackingOption = { format: "image/jpeg", quality: 100 };
       let imageBuffer: ArrayBuffer = new ArrayBuffer(1);
       // 图片压缩或重新打包
       imageBuffer = await imagePackerApi.packing(imageSource, packOpts);
       imageBuffer = await zipImageUtil.packingImage(imageBuffer, pixelMap, 100, 500*1024); //压缩到500kb
       console.log('压缩后的字节长度：'+imageBuffer.byteLength/1024)

        //转成base64地址
        let base64Str:string = Buffer.from(imageBuffer).toString('base64')
        return base64Str

        }catch(e){
            throw new Error(`相册 获取照片失败 ： ${JSON.stringify(e)}`);
        }


    }

}


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   new getPictureFromAlbum().initData().then(res => {
            let base64=res
          })
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