@Override
  public void selected(ImageFloder floder) {

    mImgDir = new File(floder.getDir());
    mImgs =
        Arrays.asList(
            mImgDir.list(
                new FilenameFilter() {
                  @Override
                  public boolean accept(File dir, String filename) {
                    if (filename.endsWith(".jpg")
                        || filename.endsWith(".png")
                        || filename.endsWith(".jpeg")) return true;
                    return false;
                  }
                }));
    /** 可以看到文件夹的路径和图片的路径分开保存,极大的减少了内存的消耗; */
    mAdapter =
        new MyAdapter(
            getApplicationContext(), mImgs, R.layout.grid_item, mImgDir.getAbsolutePath());
    mGirdView.setAdapter(mAdapter);
    // mAdapter.notifyDataSetChanged();
    mImageCount.setText(floder.getCount() + "张");
    mChooseDir.setText(floder.getName());
    mListImageDirPopupWindow.dismiss();
  }
  /** 初始化展示文件夹的popupWindw */
  private void initListDirPopupWindw() {
    mListImageDirPopupWindow =
        new ListImageDirPopupWindow(
            LayoutParams.MATCH_PARENT,
            (int) (mScreenHeight * 0.7),
            mImageFloders,
            LayoutInflater.from(getApplicationContext()).inflate(R.layout.list_dir, null));

    mListImageDirPopupWindow.setOnDismissListener(
        new OnDismissListener() {

          @Override
          public void onDismiss() {
            // 设置背景颜色变暗
            WindowManager.LayoutParams lp = getWindow().getAttributes();
            lp.alpha = 1.0f;
            getWindow().setAttributes(lp);
          }
        });
    // 设置选择文件夹的回调
    mListImageDirPopupWindow.setOnImageDirSelected(this);
  }