// 显示某个相册的照片列表Fragment;
  private void showPhotoPickerFragment(String albumName, List<PhotoInfo> list) {
    // 显示左边按钮;
    mTvLeftCancleBtn.setVisibility(View.VISIBLE);
    mTvLeftArrowBtn.setVisibility(View.VISIBLE);
    mTitleTextView.setText(albumName);

    FragmentTransaction transaction =
        mFragmentManager
            .beginTransaction()
            .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
    // 替换当前的Fragment;
    if (!mPhotoPickerFragment.isAdded()) { // 先判断是否被add过,如果没有add过,直接add这个fragment;
      Bundle args = new Bundle();
      // 这个每次进入前都要把文件夹照片列表发送给photopickfragment;
      PhotoList photoSerializable = new PhotoList();
      photoSerializable.setList(list);
      args.putSerializable("list", photoSerializable);
      mPhotoPickerFragment.setArguments(args);
      transaction
          .hide(mPhotoFolderFragment)
          .add(R.id.fragment_container, mPhotoPickerFragment)
          .commit(); // 隐藏当前的fragment,add下一个到Activity中
    } else { // 如果已经add过,隐藏这个fragment,并且显示下一个fragment;
      mPhotoPickerFragment.updateDataList(list);
      transaction
          .hide(mPhotoFolderFragment)
          .show(mPhotoPickerFragment)
          .commit(); // 隐藏当前的fragment,显示下一个
    }
    mCurrentFragment = mPhotoPickerFragment;
  }
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.lp_activity_localphoto);

    setTitleView();

    mFragmentManager = getSupportFragmentManager();

    mPhotoFolderFragment = new AlbumFragment();
    mPhotoPickerFragment = new PhotoPickerFragment();
    mPhotoPickerFragment.setOnPhotoSelectClickListener(this);

    mContentResolver = getContentResolver();
    mListImageInfo.clear();

    mAlbumName = getIntent().getStringExtra("albumName");
    new ImageLoadAsyncTask().execute();
  }