Q:

Parsing JSON api starting from an array - [

I am having trouble parsing my JSON API - 
[
   {
      "Id":1,
      "FirstName":"admin",
      "LastName":"admin",
      "Mobile":null,
      "Email":"rajaish.rolen@gmail.com",
      "UserName":"admin",
      "password":"admin",
      "RoleID":0,
      "CreationDate":"2013-11-15T00:00:00",
      "ModificationDate":"2013-11-15T00:00:00"
   }
]

I've read some tutorials online, with a JSONParser class in which there is a getJSONFromURL method which returns JSONObject. But in all these tutorials their API starts from a JSON Object {, whereas mine starts from an array [. What changes do I need to make so that I can parse this api? Any other way of doing it? Please help me out, its been a head-scratcher for 3 days.
Here is my JSONParser class - 
package com.example.projectfortab;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.util.Log;

public class JSONParser {
    static InputStream is = null;
    static JSONArray jObj = null;
    static String json = "";

    // constructor
    public JSONParser() {
    }

    public JSONArray getJSONFromUrl(String url) {

        // Making HTTP request
        try {
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);
            httpPost.setHeader("Accept", "application/json");
            httpPost.setHeader("Content-type", "application/json");

            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();           

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    is, "iso-8859-1"), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
            is.close();
            json = sb.toString();
        } catch (Exception e) {
            Log.e("Buffer Error", "Error converting result " + e.toString());
        }

        // try parse the string to a JSON object
        try {
            jObj = new JSONArray(json);
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }

        // return JSON String
        return jObj;
    }
}

and here is what I am doing to parse it - 
private static final String url = (Some url);                               
private static final String TAG_ID = "CreationDate";
private static final String TAG_FIRSTNAME = "password";
private static final String TAG_LASTNAME = "LastName";
String id;
JSONArray user = null; here

private class JSONParse extends AsyncTask<String, String, JSONArray> {
    private ProgressDialog pDialog;

    @Override
    protected JSONArray doInBackground(String... params) {
    JSONParser jParser = new JSONParser();
     JSONArray json = jParser.getJSONFromUrl(url);
        System.out.println("LENGTH" + json.length());
    try {
        JSONObject json1 = json.getJSONObject(0);
        if(json1.has(TAG_ID))
            id = json1.getString(TAG_ID);
        else
            System.out.println("NO SUCH KEY");
    } catch (JSONException e) {
        e.printStackTrace();
    }
    Log.d("anush", "ID From JSON : " + id);
    return json;
}

when I tried this, logcat showing - 
11-19 12:39:44.812: E/JSON Parser(29746): Error parsing data org.json.JSONException: Value {"ExceptionType":"System.NullReferenceException","Message":"An error has occurred.","StackTrace":"   at Lifestyle.Models.UserLoginRepository.Save(UserLogin item) in D:\\project\\LifestyleSolution2\\LifestyleSolution\\LifestyleSolution\\Lifestyle\\Models\\Repository\\UserLoginRepository.cs:line 83\r\n   at Lifestyle.Controllers.UserController.Post(UserLogin user) in D:\\project\\LifestyleSolution2\\LifestyleSolution\\LifestyleSolution\\Lifestyle\\Controllers\\UserController.cs:line 51","ExceptionMessage":"Object reference not set to an instance of an object."} of type org.json.JSONObject cannot be converted to JSONArray

and
11-19 12:39:44.842: E/AndroidRuntime(29746): FATAL EXCEPTION: AsyncTask #1
11-19 12:39:44.842: E/AndroidRuntime(29746): java.lang.RuntimeException: An error occured while executing doInBackground()
11-19 12:39:44.842: E/AndroidRuntime(29746):    at android.os.AsyncTask$3.done(AsyncTask.java:299)
11-19 12:39:44.842: E/AndroidRuntime(29746):    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
11-19 12:39:44.842: E/AndroidRuntime(29746):    at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
11-19 12:39:44.842: E/AndroidRuntime(29746):    at java.util.concurrent.FutureTask.run(FutureTask.java:239)
11-19 12:39:44.842: E/AndroidRuntime(29746):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
11-19 12:39:44.842: E/AndroidRuntime(29746):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
11-19 12:39:44.842: E/AndroidRuntime(29746):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
11-19 12:39:44.842: E/AndroidRuntime(29746):    at java.lang.Thread.run(Thread.java:856)
11-19 12:39:44.842: E/AndroidRuntime(29746): Caused by: java.lang.NullPointerException
11-19 12:39:44.842: E/AndroidRuntime(29746):    at com.example.projectfortab.FirstActivity$JSONParse.doInBackground(FirstActivity.java:260)
11-19 12:39:44.842: E/AndroidRuntime(29746):    at com.example.projectfortab.FirstActivity$JSONParse.doInBackground(FirstActivity.java:1)
11-19 12:39:44.842: E/AndroidRuntime(29746):    at android.os.AsyncTask$2.call(AsyncTask.java:287)
11-19 12:39:44.842: E/AndroidRuntime(29746):    at java.util.concurrent.FutureTask.run(FutureTask.java:234)
11-19 12:39:44.842: E/AndroidRuntime(29746):    ... 4 more

A:

Try this:
        URL url1 = new URL("YOUR_URL");
        HttpURLConnection request1 = (HttpURLConnection) url1.openConnection();
        request1.setRequestMethod("GET");
        request1.connect();
        String responseBody = convertStreamToString(request1.getInputStream());
        JSONArray jsonArray = new JSONArray(responseBody);
        for (int i = 0; i < jsonArray.length(); i++) {
            String email = jsonArray.getJSONObject(i).getString("Email");
            System.out.println(email);

            //... Similarly you can parse all the objects..
        }

Method used in above class:
private static String convertStreamToString(InputStream is) {
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();
        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line).append("\n");
            }
        } catch (IOException e) {
        } finally {
            try {
                is.close();
            } catch (IOException e) {
            }
        }

        return sb.toString();
    }

