<com.facebook.widget.LoginButton

             android:id="@+id/authButton"

             android:layout_width="fill_parent"

             android:layout_height="wrap_content"

             android:layout_gravity="center_horizontal"

             android:layout_marginLeft="45dp"

             android:layout_marginRight="45dp"

             android:layout_marginTop="10dp"

             android:background="#FF3B5790" />

private UiLifecycleHelper uiHelper;

private LoginButton authButton;

 @Override

    public void onCreate(Bundle savedInstanceState)

    {

        super.onCreate(savedInstanceState);

        uiHelper = new UiLifecycleHelper(getActivity(), callback);

        uiHelper.onCreate(savedInstanceState);

  　　　authButton = (LoginButton) view.findViewById(R.id.authButton);

        authButton.setFragment(this);

        authButton.setLoginBehavior(SessionLoginBehavior.SUPPRESS_SSO);

        authButton.setReadPermissions(Arrays.asList("email", "user_likes", "user_status"));

    }

 @Override

    public void onResume()

    {

        super.onResume();

        Session session = Session.getActiveSession();

        if (session != null && (session.isOpened() || session.isClosed()))

        {

            onSessionStateChange(session, session.getState(), null);

        }

        uiHelper.onResume();

    }

    @Override

    public void onActivityResult(int requestCode, int resultCode, Intent data)

    {

        super.onActivityResult(requestCode, resultCode, data);

        uiHelper.onActivityResult(requestCode, resultCode, data);

    }

    @Override

    public void onPause()

    {

        super.onPause();

        uiHelper.onPause();

    }

    @Override

    public void onDestroy()

    {

        super.onDestroy();

        uiHelper.onDestroy();

    }

    @Override

    public void onSaveInstanceState(Bundle outState)

    {

        super.onSaveInstanceState(outState);

        uiHelper.onSaveInstanceState(outState);

    }

    private Session.StatusCallback callback = new Session.StatusCallback()

    {

        @Override

        public void call(Session session, SessionState state, Exception exception)

        {

            onSessionStateChange(session, state, exception);

        }

    };

 private void onSessionStateChange(Session session, SessionState state, Exception exception)

    {

        if (state.isOpened())

        {

            loginByFacebookFinished(session);

        }

        else if (state.isClosed())

        {

        }

    }

/**
*登陆成功
**/

 private void loginByFacebookFinished(final Session session)

    {

        Request request = Request.newMeRequest(session, new GraphUserCallback()

        {

            @Override

            public void onCompleted(GraphUser user, Response response)

            {

                dismissLoadingDlg();

                try

                {

                    AccountInfo accountInfo = null;

                    accountInfo = new AccountInfo();

                    accountInfo.setVip(false);

                    accountInfo.setHasLogin(true);

                    accountInfo.setToken(session.getAccessToken());

                    //用户信息

                    if (user != null)

                    {

                        accountInfo.setShowUserName(user.getName());

                        accountInfo.setPassword(user.getLink());

                        accountInfo.setLoginType(LoginType.FACEBOOK);

                        accountInfo.setEmail(user.getProperty("email") + "");

                        accountInfo.setLoginName(user.getProperty("name") + "");

                    }

                }

                catch (Exception e)

                {

                    // TODO Auto-generated catch block

                    e.printStackTrace();

                }

            }

        });

        request.executeAsync();

    }

 /**

     * Logout From Facebook

     */

    public  void callFacebookLogout(Context context) {

        Session session = Session.getActiveSession();

        if (session != null) {

            if (!session.isClosed()) {

                session.closeAndClearTokenInformation();

                //clear your preferences if saved

            }

        } else {

            session = new Session(context);

            Session.setActiveSession(session);

            session.closeAndClearTokenInformation();

            //clear your preferences if saved

        }

    }