title: Get result from facebook activity without onActivityResult set for session
body: <p>I'm using the android facebook sdk but I'm running into an issue.
  I created 2 classes which are:</p>
  
  <pre><code>public class FacebookSession implements Session.StatusCallback {
  
  public interface SessionCallbacks {
      public void onSessionOpened(String token, User user, boolean isNewProfile);
      public void onSessionOpenFailed(String errorText);
  }
  
  public FacebookSession(Activity activity) {
      ...
  }
  
  @Override
  public void call(Session session, SessionState sessionState, Exception e) {
      switch (sessionState) {
          case CLOSED:
              ...
              // Calling SessionCallbacks callbacks here
              break;
  
          case CLOSED_LOGIN_FAILED:
              ...
              // Calling SessionCallbacks callbacks here
              break;
  
          case OPENED:
              ...
              // Calling SessionCallbacks callbacks here
              break;
  
          case OPENED_TOKEN_UPDATED:
              ...
              // Calling SessionCallbacks callbacks here
              break;
      }
  }
  }
  </code></pre>
  
  <p>And in my activity calling facebook session:</p>
  
  <pre><code>public class LoginActivity extends FragmentActivity implements
      FacebookSession.SessionCallbacks {
  
  public LoginActivity() {
  
  }
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_login);
      ...
  }
  
  @Override
  public void onActivityResult(int requestCode, int resultCode, Intent data) {
      super.onActivityResult(requestCode, resultCode, data);
  
      Session.getActiveSession().onActivityResult(this, requestCode,
              resultCode, data);
  }
  
  @Override
  public void onSessionOpened(String token, User user, boolean isNewProfile) {
      ...
  }
  }
  </code></pre>
  
  <p>As you can see I HAVE TO call <code>Session.getActiveSession().onActivityResult(this, requestCode, resultCode, data);</code> in the <code>onActivityResult</code> method of every activity using my <code>FacebookSession</code> class if I want the result to be returned in the <code>call</code> callback of <code>FacebookSession</code>. If I don't, my <code>FacebookSession</code> just doesn't work. What I want to do here is not having to call this <code>Session.getActiveSession().onActivityResult(this, requestCode, resultCode, data);</code> for every activities which use <code>FacebookSession</code>. Is there a workaround for this? Thank you</p>