如何检查FaceBook用户是否在Android App中登录或注销

时间:2014-07-24 14:47:50

标签: java android facebook

我从Facebook Developers网站获得此代码。它的作用是让用户登录并注销。我现在要做的是检查他们是否登录或退出其他活动。因此,他们登录,转到新活动,在新活动中,我想看看他们是否已登录。如果是,我会显示他们的个人资料图片和名称。所以我需要知道的是:

  1. 如何检查他们是否已登录或退出
  2. 如何在会话未开始的活动中查看此内容。
  3. 谢谢!

    public class MainActivity extends Activity {
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
    
      // start Facebook Login
      Session.openActiveSession(this, true, new Session.StatusCallback() {
    
      // callback when session changes state
      @Override
      public void call(Session session, SessionState state, Exception exception) {
        if (session.isOpened()) {
    
          // make request to the /me API
          Request.newMeRequest(session, new Request.GraphUserCallback() {
    
            // callback after Graph API response with user object
            @Override
            public void onCompleted(GraphUser user, Response response) {
              if (user != null) {
                TextView welcome = (TextView) findViewById(R.id.welcome);
                welcome.setText("Hello " + user.getName() + "!");
              }
            }
          }).executeAsync();
        }
      }
    });
    }
    
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
      super.onActivityResult(requestCode, resultCode, data);
      Session.getActiveSession().onActivityResult(this, requestCode, resultCode, data);
    }
    
    }
    

2 个答案:

答案 0 :(得分:2)

我强烈建议您在Android上查看https://github.com/sromku/android-simple-facebook for Facebook。所有会话部分将由图书馆直接处理。

答案 1 :(得分:1)

试试这个,我不能认为它是正确的,但我已经在我的项目中使用过。

    //do logout
    public static void logout() {
        Session session = Session.getActiveSession();
        if (session != null && !session.isClosed()) {
            session.closeAndClearTokenInformation();
        }
    }

    //check whether login/out.
    public static boolean isLoggedIn() {
        Session session = Session.getActiveSession();
        return (session != null && session.getAccessToken() != null && session.getAccessToken().length() > 1);
    }

    //In your create you might do this
    ......
    Session session = Session.getActiveSession();
    if (session == null) {
        if (_savedInstanceState != null) {
            session = Session.restoreSession(this, null,
                    _statusCallback, _savedInstanceState);
        }
        if (session == null) {
            session = new Session(this);
        }
        Session.setActiveSession(session);
        if (session.getState().equals(SessionState.CREATED_TOKEN_LOADED)) {
            session.openForRead(new Session.OpenRequest(_fragment)
                    .setCallback(_statusCallback));
        }
    }
    .....