CODEWITHSUNDEEP
androidjson
user3310291
user3310291

Reputation:

Why json parsing is not working?

I'm fetching data through JSON-Parsing, but getting "NullPointerException" and Error A JSONArray text must start with '[' at character 1 of {. following is what I have tried so far :

/** Method for returning JSONObject */
protected JSONObject lastTweet() {

    try {
        HttpGet request = new HttpGet("http://api.androidhive.info/contacts/");
        HttpResponse response = client.execute(request);
        int statusCode = response.getStatusLine().getStatusCode();
        if (statusCode >= 200) {
            HttpEntity entity = response.getEntity();
            String data = EntityUtils.toString(entity);
            JSONArray jsonArray = new JSONArray(data);
            JSONObject lastT = jsonArray.getJSONObject(0);
            return (lastT);
        } else {
            Log.e(MY_TAG, "Error");
            return null;
        }

    } catch (ClientProtocolException e) {
        Log.e(MY_TAG, "Error " + e.getMessage());
        return null;
    } catch (IOException e) {
        Log.e(MY_TAG, "Error " + e.getMessage());
        return null;
    } catch (JSONException e) {
        Log.e(MY_TAG, "Error " + e.getMessage());
        return null;
    }

}

Now when I actually make this code work for me is following :

new AsyncTask<String, Integer, String>() {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            dialog = new ProgressDialog(MainActivity.this);
            dialog.setTitle("Please wait..");
            dialog.setMessage("Data is being loaded");
            dialog.show();
        }

        @Override
        protected String doInBackground(String... params) { // TODO
            try {
                jsonObject = lastTweet();
                return jsonObject.getString("name");
            } catch (JSONException e) {
                return null;
            }
        }

        @Override
        protected void onPostExecute(String result) { // TODO
            super.onPostExecute(result);
            textView.setText(result);
            dialog.dismiss();
        }

    }.execute(null, null, null);

that gives me the following LogCat :

Logcat snap shot

How to solve that issue?

Upvotes: 0

Views: 101

Answers (5)

Devrim
Devrim

Reputation: 15533

Json you are retriewing is not a JSONArray, it is a JSONObject

Change this:

JSONArray jsonArray = new JSONArray(data);

To this:

JSONObject jsonObject = new JSONObject (data);
JSONArray contactsJsonArray = jsonObject.getJSONArray("contacts");

// TODO: loop over contactsJsonArray
JSONObject contactJsonObject = contactsJsonArray.getJSONObject(0);
String nameOfAContact = contactJsonObject.getString("name");

Upvotes: 0

Ayyappan
Ayyappan

Reputation: 1265

you are storing json object in json array

use this:: JSONObject jsonObject = new JSONObject (data);

Upvotes: 1

Damien R.
Damien R.

Reputation: 3373

You're casting a JSONObject as a JSONArray. Change this

JSONArray jsonArray = new JSONArray(data);

to this

JSONArray jsonArray = new JSONObject(data).getJSONArray("contacts");

Upvotes: 0

dkasipovic
dkasipovic

Reputation: 6120

JSON should start and end with { and }, are you sure your json is 

{"contacts":[{},{}]}

and not only

"contacts":[{},{}]

Upvotes: 0

Massimo Milazzo
Massimo Milazzo

Reputation: 3522

The error contains the solution:

A JSONArray text must start with '['

Check if the response starts with a [ rather than a {. If it is true you are receiving a JSONObject, and not a JSONArray.

Upvotes: 1

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