title: Prevent to show state change of the Facebook login button
body: <p>I am using the Facebook login button for authentication and followed pretty much the <a href="https://developers.facebook.com/docs/android/login-with-facebook/v2.0" rel="nofollow">Facebook Login for Android</a> tutorial.</p>
  
  <p>In the <code>onSessionStateChange</code> method I make a Graph API call to retrieve the User ID:</p>
  
  <pre><code>Request request = Request.newMeRequest(session, new Request.GraphUserCallback() {
      @Override
      public void onCompleted(GraphUser user, Response response) {
          // ...
      }
   });
  
  request.executeAsync();
  </code></pre>
  
  <p>In the meantime, I don't wish the Facebook Login Button does not change from <em>Log in with Facebook</em> to <em>Log Out</em>. Any idea how to achieve this in an easy way? I reckon it might be even possible in the layout XML file, but I have not found an appropriate attribute.</p>