Retrieving JSON page values in my android app

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Android

Hi I have made a JSON Parser class and trying to fetch data from northwind web services customers tables in my andriod app. but i am getting a null pointer exception in JSON array object. I have tried the same code for different url but it works fine..

Any help will be highly appreciable. My code goes below.

Thank you in advance.

What I have tried:

MainActivity.java
package com.example.gaurav.catalog;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.text.method.ScrollingMovementMethod;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

private TextView t1;
ProgressBar pg1;
List task;
List flowerlist;

List customerlist;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

t1 = (TextView) findViewById(R.id.textView);
t1.setMovementMethod(new ScrollingMovementMethod());

pg1 = (ProgressBar) findViewById(R.id.progressBar);
pg1.setVisibility(View.INVISIBLE);

task = new ArrayList<>();
// for (int i = 0; i {

@Override
protected void onPreExecute() {
// updateDisplay("Starting Task");
if (task.size() == 0) {
pg1.setVisibility(View.VISIBLE);
}
task.add(this);
}

@Override
protected String doInBackground(String... params) {
// for (int i = 0; i < params.length; i++) {
// publishProgress("Executing task" + params[i]);
// try {
// Thread.sleep(1000);
// } catch (InterruptedException e) {
// e.printStackTrace();
// }
// }
String content = HttpManager.getData(params[0]);
return content;
}


@Override
protected void onPostExecute(String s) {
// flowerlist = FlowerJSONParser.parseFeed(s);
customerlist = CustomerJSONParser.parseFeed(s);
updateDisplay();
// updateValue();
task.remove(this);
if (task.size() == 0) {
pg1.setVisibility(View.INVISIBLE);
}
}

@Override
protected void onProgressUpdate(String... values) {
// updateDisplay(values[0]);
}
}
}
-----------------------------------------------------------
JSOPNPARSER.java

package com.example.gaurav.catalog;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.List;

public class CustomerJSONParser {
public static List parseFeed(String content) {
try {
JSONArray ar = new JSONArray(content);
List customers = new ArrayList<>();

for (int i = 0; i < ar.length(); i++) {
JSONObject obj = ar.getJSONObject(i);
Customer customer = new Customer();
customer.setCustomerid(obj.getString("customerId"));
customer.setCompanyname(obj.getString("companyname"));
customer.setContact(obj.getString("contact"));
customer.setAddress(obj.getString("address"));
customer.setCity(obj.getString("city"));
customer.setPostalcode(obj.getString("postalcode"));
customer.setCountry(obj.getString("country"));
customer.setPhone(obj.getString("phone"));
customer.setFax(obj.getString("fax"));
customer.setRegion(obj.getString("region"));
customers.add(customer);
}
return customers;
} catch (JSONException e) {
e.printStackTrace();
return null;
}
}
}
-----------------------------------------
Customer.java

package com.example.gaurav.catalog;

public class Customer {
    private String customerid;
    private String companyname;
    private String contact;
    private String contacttitle;
    private String address;
    private String city;
    private String postalcode;
    private String country;
    private String phone;
    private String fax;
    private String region;

    public String getCustomerid() {
        return customerid;
    }

    public void setCustomerid(String customerid) {
        this.customerid = customerid;
    }

    public String getCompanyname() {
        return companyname;
    }

    public void setCompanyname(String companyname) {
        this.companyname = companyname;
    }

    public String getContact() {
        return contact;
    }

    public void setContact(String contactname) {
        this.contact = contact;
    }

    public String getContacttitle() {
        return contacttitle;
    }

    public void setContacttitle(String contacttitle) {
        this.contacttitle = contacttitle;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getPostalcode() {
        return postalcode;
    }

    public void setPostalcode(String postalcode) {
        this.postalcode = postalcode;
    }

    public String getCountry() {
        return country;
    }

    public void setCountry(String country) {
        this.country = country;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }
    public String getFax() {
        return fax;
    }

    public void setFax(String fax) {
        this.fax = fax;
    }
    public String getRegion() {
        return region;
    }

    public void setRegion(String region) {
        this.region = region;
    }


}