Android: Infinite scroll using list view

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="5dp"
    android:paddingRight="5dp"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/title_person_list"
        android:text="Person List"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:gravity="center"
        android:textSize="22dp"/>

    <ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:divider="@android:color/transparent"
        android:dividerHeight="5dp"
        android:layout_below="@+id/title_person_list"
        android:id="@+id/person_list"
        />



</RelativeLayout>

list_item_person.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:id="@+id/buzz_item_container"
    android:layout_height="94dp"
    android:layout_width="match_parent"
    android:weightSum="1"
    android:padding="5dp"
    android:background="#f7f7f7"
    android:layout_margin="2dp"
    android:elevation="3dp"
    android:orientation="horizontal"


    android:divider="@android:color/holo_blue_bright"
    xmlns:android="http://schemas.android.com/apk/res/android" >

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:orientation="horizontal"
        android:padding="2dp"
        >
        <ImageView
            android:layout_width="160dp"
            android:layout_height="90dp"
            android:background="@drawable/user"
            />

    </LinearLayout>

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="match_parent"
        android:padding="2dp">

        <TextView
            android:id="@+id/text_view_name"
            android:layout_height="20dp"
            android:textColor="@android:color/holo_blue_dark"
            android:paddingLeft="15dp"
            android:textStyle="bold"
            android:layout_centerVertical="true"
            android:layout_centerHorizontal="true"
            android:gravity="center_vertical"
            android:layout_width="match_parent"
            android:background="#e7e7e1"
            xmlns:android="http://schemas.android.com/apk/res/android" />

        <TextView
            android:id="@+id/text_view_email"
            android:layout_height="20dp"
            android:textAlignment="gravity"
            android:textColor="@android:color/holo_blue_dark"
            android:paddingLeft="15dp"
            android:layout_centerVertical="true"
            android:layout_centerHorizontal="true"
            android:gravity="center_vertical"
            android:layout_width="wrap_content"
            xmlns:android="http://schemas.android.com/apk/res/android" />

        <TextView
            android:id="@+id/text_view_desc"
            android:layout_height="20dp"
            android:textAlignment="gravity"
            android:textColor="@android:color/holo_blue_dark"
            android:paddingLeft="15dp"
            android:layout_centerVertical="true"
            android:layout_centerHorizontal="true"
            android:gravity="center_vertical"
            android:layout_width="wrap_content"
            xmlns:android="http://schemas.android.com/apk/res/android" />


    </LinearLayout>
</LinearLayout>

MainActivity.java

package com.ekiras.demo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.AbsListView;
import android.widget.ListView;

import com.ekiras.demo.adapter.PersonAdapter;
import com.ekiras.demo.model.Person;

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

public class MainActivity extends AppCompatActivity {

    private ListView listView;
    private int bootCounter=0;
    private int maxRecords = 400;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final PersonAdapter personAdapter = new PersonAdapter(this,bootData());
        listView = (ListView) findViewById(R.id.person_list);
        listView.setAdapter(personAdapter);
        listView.setOnScrollListener(new AbsListView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(AbsListView absListView, int i) {

            }

            @Override
            public void onScroll(AbsListView absListView, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
                if(firstVisibleItem+visibleItemCount > totalItemCount-2 && totalItemCount<maxRecords){
                    personAdapter.add(bootData());
                    personAdapter.notifyDataSetChanged();
                }
            }
        });
    }



    private List<Person> bootData(){
        List<Person> persons = new ArrayList<Person>();
        for(int i=bootCounter;i<bootCounter+20;i++){
            Person person = new Person();
            person.setName("person-" + i);
            person.setDesc("description :" + i);
            person.setEmail("person" + i + "@ekiras.com");
            person.setImage(R.drawable.user);
            persons.add(person);
        }
        bootCounter+=20;
        return persons;
    }
}

Person.java

package com.ekiras.demo.model;

/**
 * Created by ekansh on 19/10/15.
 */
public class Person {

    private String name;
    private Integer image;
    private String email;
    private String desc;

    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", image='" + image + '\'' +
                ", email='" + email + '\'' +
                ", desc='" + desc + '\'' +
                '}';
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getImage() {
        return image;
    }

    public void setImage(Integer image) {
        this.image = image;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

}

PersonAdapter.java

package com.ekiras.demo.adapter;

import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import com.ekiras.demo.R;
import com.ekiras.demo.model.Person;

import java.util.List;

/**
 * Created by ekansh on 20/10/15.
 */
public class PersonAdapter extends BaseAdapter{

    private List<Person> personList;
    private Activity activity;
    private LayoutInflater layoutInflater;
    private ViewHolder viewHolder;

    public PersonAdapter(Activity activity,List<Person> personList) {
        this.personList = personList;
        this.activity = activity;
    }

    public void add(List<Person> persons){
        this.personList.addAll(persons);
    }

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

    @Override
    public Person getItem(int i) {
        return personList.get(i);
    }

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

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {

        if(view ==null){
            layoutInflater = LayoutInflater.from(activity);
            view = layoutInflater.inflate(R.layout.list_item_person, viewGroup, false);
            viewHolder = new ViewHolder(view);
            view.setTag(viewHolder);
        }
        else
            viewHolder = (ViewHolder) view.getTag();

        Person person = getItem(i);
        viewHolder.setValues(person);

        return view;
    }


    private class ViewHolder {
        private TextView name;
        private TextView email;
        private TextView desc;

        public ViewHolder(View view) {
            name = (TextView) view.findViewById(R.id.text_view_name);
            email = (TextView) view.findViewById(R.id.text_view_email);
            desc = (TextView) view.findViewById(R.id.text_view_desc);
        }

        public void setValues(Person person) {
            name.setText(person.getName());
            email.setText(person.getEmail());
            desc.setText(person.getDesc());
        }
    }

}