获取多媒体相册的内容

 封装一个工具类，获取相册的权限，图片的信息，截图的列表，删除图片的方法。

import { Permissions } from '@kit.AbilityKit'
import { dataSharePredicates } from '@kit.ArkData'
import { promptAction } from '@kit.ArkUI'
import { photoAccessHelper } from '@kit.MediaLibraryKit'
import { permissionManager } from '../../manager'

class CleanerManager {
  // 权限
  private permissions: Permissions[] = ["ohos.permission.READ_IMAGEVIDEO", "ohos.permission.WRITE_IMAGEVIDEO"]
  // 图片资源
  private photoAssets: photoAccessHelper.PhotoAsset[] = []
  // 图片字段
  private columns: photoAccessHelper.PhotoKeys[] = [
    photoAccessHelper.PhotoKeys.DATE_ADDED,
    //获取图片大小
    photoAccessHelper.PhotoKeys.SIZE,
  ]

  // 图片权限
  async requestPermissions() {
    try {
      // 申请权限（结合前面封装的检测权限的工具类）
      await permissionManager.requestPermissions(this.permissions)
    } catch {
      // 未开启弹窗提示
      const dialogRes = await promptAction.showDialog({
        alignment: DialogAlignment.Center,
        title: '温馨提示',
        message: '手机瘦身功能需要获取权限，请在系统设置中打开相册开关',
        buttons: [
          { text: '取消', color: $r('app.color.font_sub') },
          { text: '立即开启', color: $r('app.color.brand') }
        ]
      })
      // 打开设置页
      if (dialogRes.index === 1) {
        permissionManager.openPermissionSettingsPage()
      }
    }
  }

  // 获取图片/视频
  async getAssets() {
    const context = getContext()
    // 创建多媒体管理器
    const phAccessHelper = photoAccessHelper.getPhotoAccessHelper(context) // 获取照片访问助手
    const predicates = new dataSharePredicates.DataSharePredicates() // 创建数据共享断言
    const fetchOption: photoAccessHelper.FetchOptions = {
      fetchColumns: this.columns,
      predicates: predicates
    }
    const assets = await phAccessHelper.getAssets(fetchOption) // 获取资源
    const photoAssets = await assets.getAllObjects() // 获取所有图片
    // this.photoAssets = photoAssets
    // phAccessHelper.release()
    return photoAssets
  }

  // 获取屏幕截图列表
  async getScreenshotList() {
    const photoAssets = await this.getAssets()
    // 筛选出包含 screenshot 的图片
    //screenshot 截图文件都包含
    return photoAssets.filter((item) => item.displayName.includes('screenshot'))
  }

  // 获取视频列表
  async getVideoList() {
    const photoAssets = await this.getAssets()
    return photoAssets.filter((item) => item.photoType === photoAccessHelper.PhotoType.VIDEO)
  }

  // 删除图片
  async deletePhotos(uris: string[]) {
    const photoAssets = await this.getAssets()
    // 转换成 PhotoAsset 对象
    const deleteAssets = photoAssets.filter(v => uris.includes(v.uri))
    await photoAccessHelper.MediaAssetChangeRequest.deleteAssets(getContext(), deleteAssets)
  }
}

export const cleanerManager = new CleanerManager()