使用facebook sdk for android以编程方式在facebook上发布

Question

我尝试通过单击活动中的按钮在墙上发布消息。我第一次登录，我也可以从facebook获取我的一些个人信息。但是，当我试图在墙上发布一些东西时。它不起作用。

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

这是我试图发布到我的墙上的功能。

任何人都可以帮助我。

来自facebook的回复：

{"error":{"message":"An active access token must be used to query information about the current user","type":"OAuthException","Code":2500}}

登录代码：

public void loginToFacebook() {
        mPrefs = getPreferences(MODE_PRIVATE);
        String access_token = mPrefs.getString("access_token", null);
        long expires = mPrefs.getLong("access_expires", 0);

        if (access_token != null) {
            facebook.setAccessToken(access_token);
        }

        if (expires != 0) {
            facebook.setAccessExpires(expires);
        }

        if (!facebook.isSessionValid()) {
            facebook.authorize(this,
                    new String[] { "email", "publish_stream" },
                    new DialogListener() {

                        @Override
                        public void onCancel() {
                            // Function to handle cancel event
                        }

                        @Override
                        public void onComplete(Bundle values) {
                            // Function to handle complete event
                            // Edit Preferences and update facebook acess_token
                            SharedPreferences.Editor editor = mPrefs.edit();
                            editor.putString("access_token",
                                    facebook.getAccessToken());
                            editor.putLong("access_expires",
                                    facebook.getAccessExpires());
                            editor.commit();
                        }

                        @Override
                        public void onError(DialogError error) {
                            // Function to handle error

                        }

                        @Override
                        public void onFacebookError(FacebookError fberror) {
                            // Function to handle Facebook errors

                        }

                    });
        }
    }