Why does my android facebook sdk give a

i am trying to publish something on my wall. i am using this code, called by OnClickListener of a Button

public void postOnWall(String msg) {
        mFacebook.authorize(this,new String[] {"publish_stream", "read_stream", "offline_access"}, 
                new DialogListener() {
                        public void onError(DialogError e) {
                        }
                        public void onFacebookError(FacebookError e) {
                        }
                        public void onCancel() {
                        }
                        public void onComplete(Bundle values) { 
                        }
          }
        );

        Log.d("Tests", "Testing graph API wall post");
         try {
                Bundle parameters = new Bundle();
                parameters.putString("message", msg);
                parameters.putString("description", "test test test");
                String response = mFacebook.request("me/feed", parameters, 
                        "POST");
                Log.d("Tests", "got response: " + response);
                if (response == null || response.equals("") || 
                        response.equal开发者_StackOverflow社区s("false")) {
                   Log.v("Error", "Blank response");
                }
         } catch(Exception e) {
             e.printStackTrace();
         }
    }

The response string however reads

{"error":{"type":"OAuthException","message":"An active access token must be used to query information about the current user."}}

Also, the Dialog that should be requesting permissions never stays. it starts loading, but then dissapears.

It seems like you haven't properly authenticated the user.

I'm not sure if you just left out that part of your code or you're not doing it at all but I would take a look at the example provided with the API.