need some help?!!!!

Question

I'm having problems starting the ribbit app after i finish coding to be able to retrieve messages.

I get this error : java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference

Here is my inboxFragment

/**
 * Created by James on 4/20/2015.
 */
public class InboxFragment extends ListFragment {

    protected List<ParseObject> mMessages;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_inbox, container, false);


        return rootView;
    }

    @Override
    public void onResume() {
        super.onResume();

        getActivity().setProgressBarIndeterminateVisibility(true);

        ParseQuery<ParseObject> query = new ParseQuery<ParseObject>(ParseConstants.CLASS_MESSAGES);
        query.whereEqualTo(ParseConstants.KEY_RECIPIENT_IDS, ParseUser.getCurrentUser().getObjectId());
        query.addDescendingOrder(ParseConstants.KEY_CREATED_AT);
        query.findInBackground(new FindCallback<ParseObject>() {
            @Override
            public void done(List<ParseObject> messages, ParseException e) {
                getActivity().setProgressBarIndeterminateVisibility(false);

                if (e == null) {
                    // We found messages!
                    mMessages = messages;
                    String[] usernames = new String[mMessages.size()];
                    int i = 0;
                    for (ParseObject message : mMessages) {
                        usernames[i] = message.getString(ParseConstants.KEY_SENDER_NAME);
                        i++;
                    }
                    ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                            getListView().getContext(),
                            android.R.layout.simple_list_item_1,
                            usernames);
                    setListAdapter(adapter);
                }
            }
        });
    }
}

Answer 1 · 2015-04-30T15:08:40Z

April 30, 2015 3:08pm

Hi James,

Can you paste in the rest of the error message? It'll point to a line of Java in one of your activities somewhere.

Essentially, something is coming back blank and you're trying to convert it to a string ... not sure what yet!

Cheers,

Steve.

P.S. Do you have a Github account? Don't worry if not.

Answer 2 · 2015-05-01T15:34:06Z

May 1, 2015 3:34pm

That's not very helpful, is it! I can't figure out where the error is so we must assume it is in the last bit of code you added, I suppose.

I've looked at my code for this project but the InboxFragment gets changed later in the project.

Can you push it up to Github, I'll run it on my machine and see if I can track the problem down.

Steve.

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James Rodney

James Rodney

need some help?!!!!

2 Answers

Steve Hunter

Steve Hunter

James Rodney

James Rodney

Steve Hunter

Steve Hunter