fetching data from sparksun into android application

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hi ,

i want to fetch data from below sparkfun url to my andriod application

it is not fetching data specially it is not working after below line of code

SONObject jsonObject = new JSONObject(response);

any help will be appreciated.

Thanks,

vipul

please find code below

[/code
ublic class Main3Activity extends AppCompatActivity implements View.OnClickListener {

    private static final String URL =
            "http://data.sparkfun.com/output/9JNxdKV1opHRol0d81g1.json";
    private Views mViews;
    private BookAdapter booksAdapter;
    private ArrayList<Book> books;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);

        mViews = new Views();
        mViews.fetchBooksButton.setOnClickListener(this);

        books = new ArrayList<>();

    }

    @Override
    public void onClick(View v) {
        new BookDownloadTask().execute(URL);
    }

    class BookDownloadTask extends AsyncTask<String, Void, String> {
        @Override
        protected void onPreExecute() {
            mViews.progressBar.setVisibility(View.VISIBLE);
        }

        @Override
        protected String doInBackground(String[] params) {
            try {
                java.net.URL url = new URL(params[0]);
                HttpURLConnection connection = (HttpURLConnection) url.openConnection();

                InputStream inputStream = connection.getInputStream();
                InputStreamReader reader = new InputStreamReader(inputStream);
                BufferedReader bufferedReader = new BufferedReader(reader);

                StringBuilder stringBuilder = new StringBuilder();
                String tempString;


                while ((tempString = bufferedReader.readLine()) != null) {
                    stringBuilder.append(tempString);
                    stringBuilder.append("\n");
                }

                return stringBuilder.toString();
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(String response) {
            mViews.progressBar.setVisibility(View.GONE);

            if (response != null) {

                parseJsonResponse(response);
            }
        }
    }

    private void parseJsonResponse(String response) {
        try {

            Toast.makeText(this, "response is ok", Toast.LENGTH_SHORT).show();

            JSONObject jsonObject = new JSONObject(response);


            //String res = response;

           // Toast.makeText(this, res, Toast.LENGTH_SHORT).show();

            JSONArray bookArray = jsonObject.getJSONArray("");

            for (int i = 0; i < bookArray.length(); i++) {
                JSONObject bookObject = bookArray.getJSONObject(i);

                Toast.makeText(this, "first object", Toast.LENGTH_SHORT).show();

                String faucet = jsonObject.getString("faucet");
                int humidity = jsonObject.getInt("humidity");
                int watermeter = jsonObject.getInt("watermeter");
                String timestamp = jsonObject.getString("timestamp");

                books.add(new Book(faucet, humidity, watermeter, timestamp));
            }

            booksAdapter = new BookAdapter(Main3Activity.this, books);
            mViews.bookList.setAdapter(booksAdapter);
            mViews.bookList.setVisibility(View.VISIBLE);


        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    class Views {
        final ListView bookList;
        final ProgressBar progressBar;
        final Button fetchBooksButton;

        public Views() {
            bookList = (ListView) findViewById(R.id.booksList);
            progressBar = (ProgressBar) findViewById(R.id.progressBar);
            fetchBooksButton = (Button) findViewById(R.id.fetchBookButton);
        }
    }
}


]