send array from php to android studio

hey i have certain data on 000webhost which i want to send to my android studio app. I have checked the query by directly running on 000webhost , it is working.

But it is not sending data to android studio.I tried printing the value it prints null.Basically data i m sending trying to send an array.My fuction is performed on button click.I want a marker to appear on latitude longitude values being sent from php.BUt it send null with no error on logcat.

apiconnector i m using

package com.example.arpanagarwal.sba;

import android.util.Log;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONException;

 import java.io.IOException;

 public class Apiconnector2 {

 public JSONArray getUser() {
    //int i = 1;


    String url;
    //url = "http://10.0.0.2/uservalidate.php?BookName="+temp;
    HttpEntity httpEntity = null;
    //ArrayList<NameValuePair> nameValuePairs1 = new                     ArrayList<NameValuePair>();
    //nameValuePairs1.add(new BasicNameValuePair("search","sys"));
    try {
        System.out.println("step 3");
        url = "http://askamit2012.netne.net/callemptybin.php";
        DefaultHttpClient httpclient = new DefaultHttpClient();
        HttpGet httpGet = new HttpGet(url);
        //httpGet.setEntity(new UrlEncodedFormEntity(nameValuePairs1));

        HttpResponse httpResponse = httpclient.execute(httpGet);
        httpEntity = httpResponse.getEntity();

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

    } catch (IOException e) {
        e.printStackTrace();
    }
    JSONArray jsonArray = null;

    if (httpEntity != null) {
        try {
            String entityResponse = EntityUtils.toString(httpEntity);
            // String entityResponse = null;
            Log.e("Entity Response :", entityResponse);
            jsonArray = new JSONArray(entityResponse);
        } catch (JSONException e) {
            e.printStackTrace();
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    return jsonArray;
}

}

/*****fuction where i m calling connector*****/

 public class callemptybin extends AsyncTask<Apiconnector2,Long,JSONArray>
{
    protected JSONArray doInBackground(Apiconnector2... params) {
        System.out.println("step1");
        return params[0].getUser();

    }
    @Override
    protected void onPreExecute()
    {
        System.out.println("step4");
        super.onPreExecute();
    }

    protected void onPostExecute(JSONArray jsonArray)
    {
        System.out.println("jsonarray=" + jsonArray);
        try{
            if(jsonArray==null)
            {
                System.out.println("null");
            }
            else {
                JSONObject json = jsonArray.getJSONObject(0);

                double lat1 = json.getDouble("latitude");
                double long1 = json.getDouble("longitude");

                LatLng jpnagar = new LatLng(lat1, long1);
                mMap.addMarker(new MarkerOptions().position(jpnagar).title("Bin Empty").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN)));
            }
        }
        catch (JSONException e) {
            System.out.println("catch");
            e.printStackTrace();
        }
    }
}

/**** Function which is assingned to button ***/

public  void onthrow(View view)
{
    if(view.getId()==R.id.button3 )
    {
        //throwtrash();
        System.out.println("step 00");
        new callemptybin().execute(new Apiconnector2());
        tt=1;
    }
}

/***** Php script****/

<?php
if (isset($_SERVER['HTTP_ORIGIN'])) 
{
header("Access-Control-Allow-Origin: {$_SERVER['HTTP_ORIGIN']}");
header('Access-Control-Allow-Credentials: true');
header('Access-Control-Max-Age: 86400');    // cache for 1 day
}

// Access-Control headers are received during OPTIONS requests
if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') 
{

if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_METHOD']))
    header("Access-Control-Allow-Methods: GET, POST, OPTIONS");         

if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']))
    header("Access-Control-Allow-Headers:                 {$_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']}");

exit(0);
}


   $con = mysql_connect("mysql8.000webhost.com","********","*******");
    if(!$con)
    {
     die("Could not connect :".mysql_error());
    }
    mysql_select_db("*********",$con);


   //mysql_query($sql);
  mysql_query("set names 'utf8'"); 
   $result=mysql_query("select * from GPS where marker=1");
   while($row=mysql_fetch_assoc($result))
    {
     $output[]=$row;
    }
 print(json_encode($output));

   mysql_close($con);

?>      

logcat result.plz be careful with logcat since thr r multiple functions happening. i m checking only for one button click which has onthrow function as onclick intialized.check where json array prints as null in logcat.

04-14 21:16:51.387 1109-1109/? D/PhoneStatusBar: removeNotification      key=android.os.BinderProxy@42b5f3f0 keyCode=1119220720    old=StatusBarNotification(pkg=com.android.systemui user=UserHandle{0} id=252119    tag=null score=10: Notification(pri=1 contentView=com.android.systemui/0x1090064    vibrate=null sound=null defaults=0x0 flags=0x2 kind=[null]))
04-14 21:17:38.757 6128-6128/com.example.arpanagarwal.sba I/System.out:    **jsonarray=null**
 04-14 21:17:38.767 6128-6128/com.example.arpanagarwal.sba I/System.out: null
 04-14 21:18:56.327 6819-6835/? D/AlertSyncService: onHandleIntent action =   null