Android--Facebook Login with LoginButton

1、Layout文件添加Facebook的LoginBurtton

<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" />

2、 创建MainFragment 类，并且继承Fragment 类，

重写onCreateView()方法  ；通过LoginButton设置权限 setReadPermissions()    更多权限访问 http://developers.facebook.com/docs/reference/login/#permissions

        重写 onSessionStateChange()方法  ，作用：当session状态改变时调用该方法，state.isOpened() 为 true 时，则证明登录成功

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();

    }

3、退出登录

 /**
     * 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
        }
        
    }