Android Volley JsonObject Request Custom Adapter As BaseAdapter With Arraylist And Model Class

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">
    <Button
        android:text="Show Data"
        android:id="@+id/showbtn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

<ListView
    android:id="@+id/list"
    android:layout_width="match_parent"
    android:layout_height="match_parent"></ListView>


</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent">
<TextView
    android:id="@+id/EmployeeID"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

    <TextView
    android:id="@+id/LastName"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

    <TextView
    android:id="@+id/FirstName"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />
</LinearLayout>

package com.example.ppc.jsonarraycustomlistview;

public class Employee {


    String fname;
    String lname;

    public Employee() {
    }

    public Employee( String fname, String lname) {

        this.fname = fname;
        this.lname = lname;
    }



    public String getFname() {
        return fname;
    }

    public String getLname() {
        return lname;
    }


    public void setFname(String fname) {
        this.fname = fname;
    }

    public void setLname(String lname) {
        this.lname = lname;
    }
}

package com.example.ppc.jsonarraycustomlistview;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.ArrayList;

public class CustomAdapter extends BaseAdapter {
    private Context context;
private ArrayList<Employee> mylist;

    public CustomAdapter(Context context, ArrayList<Employee> mylist) {
        this.context = context;
        this.mylist = mylist;
    }

    @Override
    public int getCount() {
        return mylist.size();
    }

    @Override
    public Object getItem(int position) {
        return mylist.get(position);
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view= layoutInflater.inflate(R.layout.mylist,null);
        TextView firstname = view.findViewById(R.id.FirstName);
        TextView lastname = view.findViewById(R.id.LastName);
        firstname.setText(mylist.get(position).fname);
        lastname.setText(mylist.get(position).lname);
        return view;
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.ppc.jsonarraycustomlistview">
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

   implementation 'com.android.volley:volley:1.1.1'

package com.example.ppc.jsonarraycustomlistview;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.JsonRequest;
import com.android.volley.toolbox.Volley;

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

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
private ListView listView;
private Button button;
private ArrayList<Employee> mylist = new ArrayList<Employee>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        listView = findViewById(R.id.list);
        button = findViewById(R.id.showbtn);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
String url = "https://api.myjson.com/bins/1b9qi3";
                JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Request.Method.GET, url, null, new Response.Listener<JSONArray>() {
                    @Override
                    public void onResponse(JSONArray response) {
                        for(int i = 0;i<response.length();i++){
                            try {
                                JSONObject jsonObject = response.getJSONObject(i);
                                String fstname = (String) jsonObject.get("FirstName");
                                String lstname = (String) jsonObject.get("LastName");
                               mylist.add(new Employee(fstname,lstname));

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

                        }

                        CustomAdapter  customAdapter = new CustomAdapter(MainActivity.this,mylist);
                        listView.setAdapter(customAdapter);
                    }
                }, new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {

                    }
                });
                    requestQueue.add(jsonArrayRequest);

            }
        });


    }
}