即使成功登錄到Facebook，session.isOpened（）也將返回false

我是Facebook +原生Android新手。我乖乖地遵循他們網站上的步驟，但即使我成功使用Facebook登錄，我仍然在session.isOpened（）方法中收到「false」結果。我相信我已經正確設置了散列鍵，包名和類名。你能幫我解決這個代碼中的問題嗎？即使成功登錄到Facebook，session.isOpened（）也將返回false

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.executeMeRequestAsync(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() + "!"); 
       } 
      } 
      }); 
     } 
     } 
    }); 


    } 

    @Override 
    public void onActivityResult(int requestCode, int resultCode, Intent data) { 
     super.onActivityResult(requestCode, resultCode, data); 
     Session.getActiveSession().onActivityResult(this, requestCode, resultCode, data); 
    }

來源

2013-03-19 Kim Honoridez