HarmonyOS鸿蒙Next中不调起系统的图片选择，直接获取图库图片列表数据

HarmonyOS鸿蒙Next中不调起系统的图片选择，直接获取图库图片列表数据 根据你提供的HTML内容，转换后的Markdown格式如下：

根据demo：https://developer.huawei.com/consumer/cn/doc/harmonyos-samples/samples-0000001162414961#section194592546719

在api12上的效果是：我只能获取我包名下的文件夹内的图片。具体看我给的demo。

import { photoAccessHelper } from '@kit.MediaLibraryKit';
import { dataSharePredicates } from '@kit.ArkData';
import { Context } from '@kit.AbilityKit';
import Logger from '../common/utils/Logger';

const TAG = 'fu_fu_index';

export default class ImageModel {
  private phAccessHelper: photoAccessHelper.PhotoAccessHelper | null = null;

  constructor(context: Context) {
    this.phAccessHelper = photoAccessHelper.getPhotoAccessHelper(context);
  }

  async getAllImg(): Promise<photoAccessHelper.PhotoAsset[]> {
    Logger.info(TAG, 'getAllImg');
    let photoList: Array<photoAccessHelper.PhotoAsset> = [];
    if (this.phAccessHelper === null) {
      Logger.info(TAG, 'phAccessHelper fail');
      return photoList;
    }
    let fileKeyType = photoAccessHelper.PhotoKeys.PHOTO_TYPE;
    let predicates: dataSharePredicates.DataSharePredicates = new dataSharePredicates.DataSharePredicates();
    Logger.info(TAG, fileKeyType);
    let fetchOptions: photoAccessHelper.FetchOptions = {
      fetchColumns: [],
      predicates: predicates
    };

    try {
      let fetchResult: photoAccessHelper.FetchResult<photoAccessHelper.PhotoAsset> =
        await this.phAccessHelper.getAssets(fetchOptions);
      if (fetchResult != undefined) {
        Logger.info(TAG, 'fetchResult success');
        let photoAsset: Array<photoAccessHelper.PhotoAsset> = await fetchResult.getAllObjects();
        if (photoAsset != undefined && photoAsset.length > 0) {
          Logger.info(TAG, 'length:' + photoAsset.length);
          for (let i = 0; i < photoAsset.length; i++) {
            Logger.info(TAG, 'length:' + photoAsset[i].displayName);
            if (photoAsset[i].photoType === 1) {
              photoList.push(photoAsset[i]);
            }
          }
        }
      }
    } catch (err) {
      Logger.error(TAG, 'getAssets failed, message = ', err);
    }
    Logger.info(TAG, 'photoList success:' + photoList.length);
    return photoList;
  }
}

import { photoAccessHelper } from '@kit.MediaLibraryKit';
import Logger from '../common/utils/Logger';
import ImageModel from './ImageModel';

const TAG: string = 'fu_fu_Index'

@Entry
@Component
struct Index {
  private ImageModel: ImageModel = new ImageModel(getContext(this));
  @State imgDatas: Array<photoAccessHelper.PhotoAsset> = [];

  async aboutToAppear() {
    this.imgDatas = await this.ImageModel.getAllImg();
    Logger.info(TAG, `images = ${this.imgDatas.length}`);
  }

  build() {
    Column() {
      Text('获取图库相册图片数量：' + this.imgDatas.length)
        .fontColor(Color.Black)
        .fontSize(18)
        .height('10%')
      Text('总数量和真实图库中数量对不上，经过观察，好像获取到的是我自己文件夹内容的图片。我怎么获取图库中所有的呢？不拉起图库的情况下.')
        .fontColor(Color.Red)
        .fontSize(18)
        .height('10%')
      Text('我的需求是：不拉起系统调用图库的方法获取所有照片列表数据')
        .fontColor(Color.Red)
        .fontSize(18)
        .height('10%')
      Text('以下是第一张图（不显示就是没有）：')
        .fontColor(Color.Black)
        .fontSize(18)
        .height('10%')

      if (this.imgDatas.length > 0) {
        Image(this.imgDatas[0].uri)
          .id('imageShow')
          .width('90%')
          .height('50%')
          .objectFit(ImageFit.Auto)
          .backgroundColor(Color.Pink)
      }
    }
    .width('100%')
    .height('100%')
    .padding({ left: '1%', right: '1%' })
  }
}

我应该怎么修改才能达到我的预期呢？