No data displayed in listview Android0 until I set the array size in getcount to array's size +1

I'm working with listview in Android which has two sections using a custom adapter. I'm getting the data from a webservice.it's working if I set the size of the array in getcount() to array.size()+1, but then while fast scrolling through my list I get out of bounds exception.interested in your comms.

my view

<RelativeLayout 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"app:layout_behavior="@string/appbar_scrolling_view_behavior"tools:showIn="@layout/app_bar_main"><ListView    android:id="@+id/list"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:scrollbars="none"    android:scrollingCache="false"    android:animationCache="false"    android:divider="@drawable/divider"    android:dividerHeight="5dp"    />

my class

    list = (ListView) findViewById(R.id.list);    adapter = new com.santeplus.santeplusmag.santeplus.ListAdapter(this,articles);    list.setAdapter(adapter);    MultiScrollListener scrolls = new MultiScrollListener();    scrolls.addScrollListener(new EndlessScrollListener() {        @Override        public boolean onLoadMore(int page, int totalItemsCount) {            // Triggered only when new data needs to be appended to the list            // Add whatever code is needed to append new items to your AdapterView            customLoadMoreDataFromApi(page);            // or customLoadMoreDataFromApi(totalItemsCount);            return true; // ONLY if more data is actually being loaded; false otherwise.        }    });    // Append more data into the adapterpublic void customLoadMoreDataFromApi(int offset) {        flag_loading = true;     // getting paged data     adapter.notifyDataSetChanged();    flag_loading=false;    // This method probably sends out a network request and appends new data items to your adapter.    // Use the offset value and add it as a parameter to your API request to retrieve paginated data.    // Deserialize API response and then construct new objects to append to the adapter}

my Customadapter

 public class ListAdapter extends BaseAdapter  {  private ArrayList<Articles> articleList ;Context context;MainActivity main;ListAdapter(MainActivity main){    this.main = main;}public ListAdapter( MainActivity main,  ArrayList<Articles> mData) {    this.articleList = mData;    this.main = main;    this.adsList = adsList;} public ArrayList<Articles> getData() {    return articleList;}@Overridepublic int getCount() { Log.d("size of a",String.valueOf(articleList.size()+1));  return articleList!=null ? articleList.size()+1 : 0;} @Overridepublic Object getItem(int position) {    return null;} @Overridepublic int getViewTypeCount(){    return 2;}@Overridepublic int getItemViewType(int position){    if(position % 4 == 0){    return 1;}else{return 0;}} @Overridepublic View getView(int position, View convertView, ViewGroup parent) {    View v = convertView;    String s=""    ViewHolderItem holder = new ViewHolderItem();    int type = getItemViewType(position);    if (convertView == null) {            // Inflate the layout according to the view type        LayoutInflater inflater = (LayoutInflater) main.getSystemService(Context.LAYOUT_INFLATER_SERVICE);        if (type == 0) {            // Inflate the layout with the data            convertView = inflater.inflate(R.layout.cell, null);            holder.title = (TextView) convertView.findViewById(R.id.title);        } else {            // Inflate the layout with the ad            convertView = inflater.inflate(R.layout.fragment_ad, null);            holder.adView = (AdView) convertView.findViewById(R.id.adView1);        }        convertView.setTag(holder);    }else {        holder = (ViewHolderItem) convertView.getTag();    }    if (type == 0) {        holder.text1.setText(Html.fromHtml(this.main.articles.get(position).title));        try {            s = main.articles.get(position).image;            Log.d("url image",s);        }catch(UnsupportedEncodingException e){            e.printStackTrace();        }        Picasso.with(main)                .load(s)                .into(holder.image); }if(type == 1) {        com.google.android.gms.ads.AdRequest adRequest = new com.google.android.gms.ads.AdRequest.Builder()                .build();        holder.adView.loadAd(adRequest);    }    return convertView;} @Overridepublic void notifyDataSetChanged(){    super.notifyDataSetChanged();}}