HarmonyOS 鸿蒙Next 文件管理API错误，显示Permission denied

HarmonyOS 鸿蒙Next 文件管理API错误，显示Permission denied

/**
 * 从文件读取图像资源
 * @param fileName 图像文件的文件名
 * @returns 返回图像资源的PixelMap对象
 */
async readImageFromFileName(fileName: String): Promise<image.PixelMap | null> {
  let pixelMap: image.PixelMap | null = null;
  if (fileName.length === 0 || fileName === null) {
    // 如果文件名无效，使用默认图像
    console.log("FileName is empty or null, using default image.");
    fileName = "src/main/resources/base/media/img.png"; // 指定默认图像文件名
  }

  try {
    // 获取当前Ability的context
    let context = this as common.UIAbilityContext;
    // 获取resourceManager资源管理器
    const resourceMgr: resourceManager.ResourceManager = context.resourceManager;
    console.log("图像资源" + $r(`app.media.${fileName}`))
    const fileData: Uint8Array = await resourceMgr.getMediaContent($r('app.media.Toyota'))
    console.log("Succeeded in getting RawFileContent");

    // 打印文件数据的前几个字节，用于调试
    console.log("Image data bytes: " + fileData);

    // 获取图片的ArrayBuffer
    const buffer = fileData.buffer.slice(0);
    const imageSource: image.ImageSource = image.createImageSource(buffer);
    pixelMap = await imageSource.createPixelMap();
    console.log("Succeeded in creating PixelMap");
  } catch (err) {
    console.error("Failed to read image from file: ", err);
    // 处理错误，可能返回null或默认的PixelMap对象
  }
  return pixelMap;
}

{
  "requestPermissions": [
    {
      "name": "ohos.permission.USE_BLUETOOTH"
    },
    {
      "name": "ohos.permission.DISCOVER_BLUETOOTH"
    },
    {
      "name": "ohos.permission.ACCESS_BLUETOOTH",
      "reason": "$string:permission_ACCESS_BLUETOOTH",
      "usedScene": {
        "when": "always"
      }
    },
    {
      "name": "ohos.permission.GET_NETWORK_INFO",
      "reason": "$string:permission_GET_NETWORK_INFO"
    },
    {
      "name": "ohos.permission.INTERNET",
      "reason": "$string:permission_GET_NETWORK_INFO"
    },
    {
      "name": "ohos.permission.FILE_ACCESS_PERSIST"
    },
    {
      "name": "ohos.permission.READ_MEDIA",
      "reason": "$string:app_name",
      "usedScene": {
        "abilities": [
          "EntryAbility"
        ],
        "when": "inuse"
      }
    },
    {
      "name": "ohos.permission.WRITE_MEDIA",
      "reason": "$string:app_name",
      "usedScene": {
        "abilities": [
          "EntryAbility"
        ],
        "when": "inuse"
      }
    }
  ]
}