// 更新用户显示信息
  public void updateUserData() {
    // 提取当前登陆用户的信息
    MyApplication myApplication = (MyApplication) getActivity().getApplication();
    User user = myApplication.getUser();
    Log.w("user is null?", (user == null) ? "is" : "no");

    // 头像
    headView = (RoundImageView) rootLayout.findViewById(R.id.left_user_head);
    Log.w("head", user.getHead());
    headView.setImageBitmap(
        BitmapFactory.decodeFile(DataVar.APP_IMG_FILE + File.separator + user.getHead()));

    // 昵称
    tvNickName = (TextView) rootLayout.findViewById(R.id.left_user_nickname);
    tvNickName.setText(user.getNickName());
  }
  @Override
  public View onCreateView(
      LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    rootLayout = inflater.inflate(R.layout.frag_left, null);

    // 所有选项
    View mainView = rootLayout.findViewById(R.id.tvMain);
    View bookCategoryView = rootLayout.findViewById(R.id.tvBookCategory);
    View robotView = rootLayout.findViewById(R.id.head_robot);
    View accountView = rootLayout.findViewById(R.id.tvAccount);
    View settingsView = rootLayout.findViewById(R.id.tvSettings);
    View aboutView = rootLayout.findViewById(R.id.tvAbout);

    // 提取当前登陆用户的信息
    MyApplication myApplication = (MyApplication) getActivity().getApplication();
    User user = myApplication.getUser();
    Log.w("user is null?", (user == null) ? "is" : "no");

    // 头像
    headView = (RoundImageView) rootLayout.findViewById(R.id.left_user_head);
    Log.w("head", user.getHead());
    headView.setImageBitmap(
        BitmapFactory.decodeFile(DataVar.APP_IMG_FILE + File.separator + user.getHead()));
    headView.setOnClickListener(this);

    // 昵称
    tvNickName = (TextView) rootLayout.findViewById(R.id.left_user_nickname);
    tvNickName.setText(user.getNickName());

    mainView.setOnClickListener(this);
    bookCategoryView.setOnClickListener(this);
    robotView.setOnClickListener(this);
    accountView.setOnClickListener(this);
    settingsView.setOnClickListener(this);
    aboutView.setOnClickListener(this);

    Log.w("test", "leftFragmentonCreateView");
    return rootLayout;
  }