@Override
  public void detailFragmentClick(int position) {
    Log.d(thisClass, position + " is choose");

    ArrayList<UIFileInfo> children = UIFileInfo.addFileFrom(currentSelectedDir());
    if (children != null) {
      if (position >= children.size()) {
        throw new RuntimeException("position < childrenCache.get(fatherIndex).size()");
      }
    } else {
      throw new RuntimeException("");
    }
    UIFileInfo UIFileInfo = children.get(position);
    if (UIFileInfo.isDir()) {
      folderFragment.clearListView();
      folderFragment.addListView(children).notifyDataSetChanged();

      updateDetailFileInfo(UIFileInfo.toFile());
    } else {
      // decrypt file and show it
      FileEncryption fileEncryption;
      try {
        fileEncryption = new FileEncryption(UIFileInfo.toFile(), password);
      } catch (IOException e) {
        Log.e(thisClass, "can't read file" + e);
        return;
      }
      DecryptedFile decryptedFile;
      try {
        if (fileEncryption.largeLinkedSize()) {
          decryptedFile = fileEncryption.decryptPart();
        } else {
          fileEncryption.decryptAll(true);
        }
      } catch (InvalidAlgorithmParameterException
          | InvalidKeyException
          | NoSuchAlgorithmException
          | IOException
          | UnrecoverableEntryException e) {
        Log.e(thisClass, " failed: " + e.toString());
      }

      // add file path of to be deleted file
      delPaths.add(fileEncryption.getEncryptedFilePath());

      // start app to view different file
      //            Intent intent = getMyImgIntent(this, fileEncryption);
      Intent intent = new Intent(Intent.ACTION_VIEW);
      intent.setDataAndType(
          Uri.parse(fileEncryption.getFileUri()),
          FileUtility.getMimeType(fileEncryption.getLinkedFilePath()));

      if (IntentUtil.intentSafe(intent, this)) {
        startActivity(intent);
      }
    }
  }
  @Override
  public void detailFragmentLongPress(int position) {
    Log.d(thisClass, position + " is choose");

    UIFileInfo UIFileInfo = currentSelectedChildren(position);
    if (UIFileInfo.isDir()) {
    } else {
      FileEncryption fileEncryption;
      try {
        fileEncryption = new FileEncryption(UIFileInfo.toFile(), password);
      } catch (IOException e) {
        Log.e(thisClass, "can't read file" + e);
        return;
      }
      showMenuDialog(fileEncryption);
    }
  }