android - Not able to retrieve array from parse.com

Question

i have made this array column in parse.com dashboard.i am able to add values in the array from my app but m not able to get the array or list and using any function on it(even size() ) give null point exception on that line.

i have used many solutions but none worked.

my code where it is giving error.

real = (TextView) v.findViewById(R.id.realtext);
        fake = (TextView) v.findViewById(R.id.faketext);
        realbutton = (ImageButton) v.findViewById(R.id.realbutton);
        fakebutton = (ImageButton) v.findViewById(R.id.fakebutton);
        real.setText(String.valueOf(news.getRealvote()));
        fake.setText(String.valueOf(news.getFake()));
fakebutton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                news.setuserArray(news.getAuthor().getUsername());
                List<ParseObject> a = news.getUserArray();


                Toast.makeText(c, a.toString(), Toast.LENGTH_SHORT).show();//any thing with a.size() etc anything gives error

                news.setFake();
                news.saveInBackground();
                fake.setText(String.valueOf(news.getFake()));

                realbutton.setVisibility(View.GONE);
                fakebutton.setVisibility(View.GONE);

            }
        });

here is my getUserArray() method

public List<ParseObject> getUserArray() {

    return getList("users_rated");
}

the method to store data is working

public void setuserArray(String file) {
    addUnique("users_rated", file);
}

i have tried a lot but no success.plss help me retrieving the array.

are you asking for list adapter??

public class Customnewslistview extends ParseQueryAdapter<News> {

Context c;

public Customnewslistview(Context context) {
    super(context, "News");
    c = context;
}

@Override
public View getItemView(final News news, View v, ViewGroup parent) {

    if (v == null) {
        final TextView real;
        final TextView fake;
        final ImageButton realbutton;
        final ImageButton fakebutton;
        final ProgressBar loader;
        v = View.inflate(getContext(), R.layout.item_list_news_public, null);

        loader = (ProgressBar) v.findViewById(R.id.eachnewsloder);

        ParseImageView newsImage = (ParseImageView) v
                .findViewById(R.id.icon);
        ParseFile photoFile = news.getParseFile("photo");
        if (photoFile != null) {
            newsImage.setParseFile(photoFile);
            newsImage.loadInBackground(new GetDataCallback() {
                @Override
                public void done(byte[] data, ParseException e) {
                    Log.d("done pic", data.toString());
                    loader.setVisibility(View.GONE);
                }
            });
        } else {
            loader.setVisibility(View.GONE);
            newsImage.setBackgroundResource(R.drawable.image40);
        }

        TextView titleTextView = (TextView) v.findViewById(R.id.text1);
        titleTextView.setText(news.getTitle());
        // trying real fake buttons
        real = (TextView) v.findViewById(R.id.realtext);
        fake = (TextView) v.findViewById(R.id.faketext);
        realbutton = (ImageButton) v.findViewById(R.id.realbutton);
        fakebutton = (ImageButton) v.findViewById(R.id.fakebutton);
        real.setText(String.valueOf(news.getRealvote()));
        fake.setText(String.valueOf(news.getFake()));
        realbutton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                news.setuserArray(news.getAuthor().toString());
                news.setRealvote();
                news.saveInBackground();
                real.setText(String.valueOf(news.getRealvote()));

                Toast.makeText(getContext(), "No Cheating",
                        Toast.LENGTH_SHORT).show();

                realbutton.setVisibility(View.GONE);
                fakebutton.setVisibility(View.GONE);

            }
        });
        fakebutton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                news.setuserArray(news.getAuthor().getUsername());
                List<ParseObject> a=null;
                try {
                    a = news.fetchIfNeeded().getList("users_rated");
                } catch (ParseException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }


                Toast.makeText(c, a.toString(), Toast.LENGTH_SHORT).show();

                news.setFake();
                news.saveInBackground();
                fake.setText(String.valueOf(news.getFake()));

                realbutton.setVisibility(View.GONE);
                fakebutton.setVisibility(View.GONE);

            }
        });
        titleTextView.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Dialog d = new Dialog(c);
                d.setContentView(R.layout.publicnewsdialog);
                d.setTitle("News");
                TextView text = (TextView) d.findViewById(R.id.dialogtext);
                text.setText(news.getTitle());
                // parsing image
                ParseImageView newsImage = (ParseImageView) d
                        .findViewById(R.id.dialogimage);
                ParseFile photoFile = news.getParseFile("photo");
                if (photoFile != null) {
                    newsImage.setParseFile(photoFile);
                    newsImage.loadInBackground(new GetDataCallback() {
                        @Override
                        public void done(byte[] data, ParseException e) {
                            Log.d("done pic", data.toString());

                        }
                    });
                } else {
                    loader.setVisibility(View.GONE);
                    newsImage.setBackgroundResource(R.drawable.image40);
                }
                d.show();

            }
        });
    }

    return v;
}

}

Answer 1

This is the method I use to get a List of a DB of TrackedLocation objects:

ParseQuery<ParseObject> query = ParseQuery.getQuery("TrackedLocation"); 
query.whereEqualTo("imei", helpUtils.getDeviceIDEqualsIMEI());
query.setLimit(1000);
query.findInBackground(new FindCallback<ParseObject>() 
{
    @Override
     public void done(List<ParseObject> dataList, ParseException e) {}
});

Do what you want with the dataList of ParseObjects you will receive on the done callback.