Android : How to update status on facenook

i want to update status on facebook by app ,so i have searched alots but not able to update status on facebook ,i have imported facebook sdk3.15.0,it gives permission error in logcat.so let me know how is it possible to update status ,and it gives response null ,my code is

  imgfacebook.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    facebook = new Facebook(APP_ID);
                    mAsyncRunner = new AsyncFacebookRunner(facebook);
                    loginToFacebook();
                }
            });


    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);
                postToWall(CheckRating);
            }

            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();
                                postToWall(CheckRating);
                            }

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

                            }

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

                            }

                        });

public void postToWall(final String msg) {

        try {
            // Bundle parameters = new Bundle();
            // parameters.putString("message", "Text is lame. Listen up:");
            // parameters.putString("name", "Name");
            // parameters.putString("link", "http://www.google.com");
            // parameters.putString("caption", "Caption");
            // parameters.putString("description", "Description");
            //
            // String response = facebook.request("me/feed", parameters,
            // "POST");
            // Log.v("response", response);
            Bundle parameters = new Bundle();
            parameters.putString("message", "Text is lame. Listen up:");
            parameters.putString("method", "stream.publish");
            String response = facebook.request(parameters);
            Log.v("response", response);
            System.out.println("Response is ....." + response);
        } catch (Exception e) {
            System.out.println("Response is nulll......");
        }
        // post on user's wall.

    }