@Override
    public WeiBoUser workInBackground(String... params) throws TaskException {
      // 1、请求授权
      AccessToken accessToken = SinaSDK.getInstance(null).getAccessToken(params[0]);
      AccountBean account = new AccountBean();
      account.setToken(accessToken);

      // 2、加载用户信息
      publishProgress(R.string.account_load_userinfo);
      WeiBoUser user = SinaSDK.getInstance(accessToken).userShow(accessToken.getUid(), null);

      // 3、加载分组信息
      publishProgress(R.string.account_load_groups);
      Groups groups = SinaSDK.getInstance(accessToken).friendshipGroups();

      // 4、更新新账户到DB
      account.setUser(user);
      account.setGroups(groups);
      account.setAccount(mAccount);
      account.setPassword(mPassword);
      account.setUserId(user.getIdstr());
      // 2014-09-18 移除了所有账户信息,包括LoggedIn,所以需要调用AccountFragment.login()
      AccountDB.remove(account.getUserId());
      AccountDB.newAccount(account);

      if (AppContext.isLogedin()
          &&
          // 2014-09-18 仅更新登录用户数据
          AppContext.getUser().getIdstr().equals(user.getIdstr())) {
        AccountFragment.login(account, false);
      }

      if (getActivity() != null) {
        Intent data = new Intent();
        data.putExtra("token", accessToken);
        getActivity().setResult(Activity.RESULT_OK, data);
      }

      return user;
    }