Combine Facebook login and permission request into one

I am trying to create a dialog that asks users to login with Facebook. In reality I don’t care much for the login per se: all I really want is permission to post photos on behalf of the user; nothing else. Below is my Dialog in its entirety. Will someone please correct the code for me? Right now its crashing with some NPE within the Facebook library. I compare my code with the sample HelloFacebookSampleActivity. I can see that the two are obviously different. But I can’t seem to fix mine correctly. Again, I am hoping to at once ask the user to Login and get the permission as opposed to doing it in two steps.

public class FacebookOptInFragment extends DialogFragment {
    private final String TAG = FacebookOptInFragment.class.getSimpleName();
    private LoginButton loginButton;
    private GraphUser user;
    private static final String PERMISSION = "publish_actions";

    private UiLifecycleHelper uiHelper;

    private Session.StatusCallback callback = new Session.StatusCallback() {
        @Override
        public void call(Session session, SessionState state, Exception exception) {
            onSessionStateChange(session, state, exception);
        }
    };

    private void onSessionStateChange(Session session, SessionState state, Exception exception) {
        if ((exception instanceof FacebookOperationCanceledException || exception instanceof FacebookAuthorizationException)) {
            new AlertDialog.Builder(FacebookOptInFragment.this.getActivity())
                .setTitle("Cancel")
                .setMessage("Permission not granted")
                .setPositiveButton("Ok", null)
                .show();
        }
        updateUI();
    }

    private void updateUI() {
        Session session = Session.getActiveSession();
        if (session != null && session.isOpened()) {
            //user has agreed to post photos… so make a note of that
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        getDialog().getWindow().requestFeature(Window.FEATURE_NO_TITLE);
        View view = inflater.inflate(R.layout.facebook_optin, container);
        loginButton = (LoginButton) view.findViewById(R.id.login_button);
        loginButton.setUserInfoChangedCallback(new LoginButton.UserInfoChangedCallback() {
            @Override
            public void onUserInfoFetched(GraphUser user) {
                FacebookOptInFragment.this.user = user;
                updateUI();
            }
        });

        return view;
    }

}

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Looking at the HelloFacebookSampleActivity, I see that the Login process is separate from the permission request process. Is there a way to combine the two? That is, when I ask a user to Login with Facebook, I “automatically” get the permissions I need. What I mean specifically is that I don’t want two different windows at two different times. This is important for my case because all I really want is the permission to share photos for the user; the login itself is irrelevant. So how might I combine the two?

The sample codes from HelloFacebookSampleActivity mentioned are

For Login

loginButton = (LoginButton) findViewById(R.id.login_button);
        loginButton.setUserInfoChangedCallback(new LoginButton.UserInfoChangedCallback() {
            @Override
            public void onUserInfoFetched(GraphUser user) {
                HelloFacebookSampleActivity.this.user = user;
                updateUI();
                // It's possible that we were waiting for this.user to be populated in order to post a
                // status update.
                handlePendingAction();
            }
        });

For permission request

session.requestNewPublishPermissions(new  Session.NewPermissionsRequest(this, PERMISSION));

Will someone please show a complete code snippet showing how to ask for permission while login in. I am very new to this so filling in the blanks is difficult, so a complete snippet would be helpful, which is why I submit my entire class for editing.