Pass different data : ViewPager cards inspired by Duolingo - android-studio

Question

I just started app developing recently and stumbled upon a problem that I basically can't figure out : https://rubensousa.github.io/2016/08/viewpagercards
He instructed that on CardPagerAdapter.java in instantiateItem, I need to set the data according to the position. But how do I do it?
I want the first card to have a title of "FIRST CARD" while the second "SECOND CARD" and so on.. hope someone could help.
CardPagerAdapter.java
import android.support.v4.view.PagerAdapter;
import android.support.v7.widget.CardView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class CardPagerAdapter extends PagerAdapter implements CardAdapter {
private List<CardView> mViews;
private List<CardItem> mData;
private float mBaseElevation;
public CardPagerAdapter() {
mData = new ArrayList<>();
mViews = new ArrayList<>();
}
public void addCardItem(CardItem item) {
mViews.add(null);
mData.add(item);
}
public float getBaseElevation() {
return mBaseElevation;
}
#Override
public CardView getCardViewAt(int position) {
return mViews.get(position);
}
#Override
public int getCount() {
return mData.size();
}
#Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
#Override
public Object instantiateItem(ViewGroup container, int position) {
View view = LayoutInflater.from(container.getContext())
.inflate(R.layout.fragment_adapter, container, false);
container.addView(view);
bind(mData.get(position), view);
CardView cardView = (CardView) view.findViewById(R.id.cardView);
if (mBaseElevation == 0) {
mBaseElevation = cardView.getCardElevation();
}
cardView.setMaxCardElevation(mBaseElevation * MAX_ELEVATION_FACTOR);
mViews.set(position, cardView);
return view;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
mViews.set(position, null);
}
private void bind(CardItem item, View view) {
TextView title = (TextView) view.findViewById(R.id.title);
TextView description = (TextView) view.findViewById(R.id.description);
Button button = (Button) view.findViewById(R.id.button);
title.setText(item.getTitle());
description.setText(item.getText());
button.setText(item.getButton());
}
}