Android - Facebook SDK 3, login and post to wall with one button

问题

The code below is taken from the official tutorial. I'm using ActionBarSherlock, so my Activity extends SherlockFragmentActivity, it works if I use them one time each (login and post), but it can't work if I want to login and post with only one button.

The class variable:

    private static final List<String> PERMISSIONS = Arrays.asList("publish_actions");
private static final String PENDING_PUBLISH_KEY = "pendingPublishReauthorization";
private boolean pendingPublishReauthorization = false;

The actionbar button:

        case R.id.askOnFacebook:
    {
        final Activity tmpAct = this;  
        // start Facebook Login
        Session.openActiveSession(this, true, new Session.StatusCallback() 
        {               
            // callback when session changes state
            @Override
            public void call(Session session, SessionState state, Exception exception) {
                if (session.isOpened()) {

                    // make request to the /me API
                    Request.newMeRequest(session, new Request.GraphUserCallback() {

                        // callback after Graph API response with user object
                        @Override
                        public void onCompleted(GraphUser user, Response response) {
                            if (user != null) {
                                Toast.makeText(getApplicationContext(), "utente " + user.getName(), Toast.LENGTH_LONG).show();
                                publishStory(tmpAct);
                            }
                        }
                    });
                }
            }
        });
    }

the other methods:

    @Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    Session.getActiveSession().onActivityResult(this, requestCode, resultCode, data);
}

private void publishStory(final Activity activity) {
    Session session = Session.getActiveSession();

    if (session != null){

        // Check for publish permissions    
        List<String> permissions = session.getPermissions();
        if (!isSubsetOf(PERMISSIONS, permissions)) {
            pendingPublishReauthorization = true;
            Session.NewPermissionsRequest newPermissionsRequest = new Session
                    .NewPermissionsRequest(this, PERMISSIONS);
            session.requestNewPublishPermissions(newPermissionsRequest);
            return;
        }

        Bundle postParams = new Bundle();
        postParams.putString("name", "nam");
        postParams.putString("caption", "capProva");
        postParams.putString("description", "desAsd");
        postParams.putString("link", "https://developers.facebook.com/android");
        postParams.putString("picture", "https://raw.github.com/fbsamples/ios-3.x-howtos/master/Images/iossdk_logo.png");

        Request.Callback callback= new Request.Callback() {
            public void onCompleted(Response response) {
                JSONObject graphResponse = response
                        .getGraphObject()
                        .getInnerJSONObject();
                String postId = null;
                try {
                    postId = graphResponse.getString("id");
                } catch (JSONException e) {
                    Log.i(activity.toString(),
                            "JSON error "+ e.getMessage());
                }
                FacebookRequestError error = response.getError();
                if (error != null) {
                    Toast.makeText(activity
                            .getApplicationContext(), 
                            "ERROR: " + error.getErrorMessage(),
                            Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(activity
                            .getApplicationContext(), 
                            "POSTED: " + postId,
                            Toast.LENGTH_LONG).show();
                }
            }
        };


        Request request = new Request(session, "me/feed", postParams, HttpMethod.POST, callback);

        RequestAsyncTask task = new RequestAsyncTask(request);
        task.execute();
    }

}

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);

        outState.putBoolean(PENDING_PUBLISH_KEY, pendingPublishReauthorization);
//XXX !!!!!!! I removed the line below because in the tutorial onCreate method it's not initialized
    //uiHelper.onSaveInstanceState(outState);

}

private boolean isSubsetOf(Collection<String> subset, Collection<String> superset) {
    for (String string : subset) {
        if (!superset.contains(string)) {
            return false;
        }
    }
    return true;
}

inside onCreate:

        if (savedInstanceState != null) {
        pendingPublishReauthorization = 
            savedInstanceState.getBoolean(PENDING_PUBLISH_KEY, false);
    }

I noticed that in debug mode, it never pass from onCompleted, so the publish method is never called. If I move the call to publishStory after Session.openActiveSession it works bad and I get some crash (I suppose because before it need to login and after I need to click again to the button to post to facebook wall).

How all could work with a single click on the button?

来源：https://stackoverflow.com/questions/19666601/android-facebook-sdk-3-login-and-post-to-wall-with-one-button