public class CardListItemAdapter extends ECCardContentListItemAdapter<String> {

    public CardListItemAdapter(@NonNull Context context, @NonNull List<String> objects) {
        super(context, R.layout.list_item, objects);
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        ViewHolder viewHolder;
        View rowView = convertView;

        if (rowView == null) {
            LayoutInflater inflater = LayoutInflater.from(getContext());
            rowView = inflater.inflate(R.layout.list_item, null);
            viewHolder = new ViewHolder();
            viewHolder.itemText = (TextView) rowView.findViewById(R.id.list_item_text);
            rowView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) rowView.getTag();
        }

        String item = getItem(position);
        if (item = null) {
            viewHolder.itemText.setText(item);
        }
        return rowView;
    }

    static class ViewHolder {
        TextView itemText;
    }

}

public class CardDataImpl implements ECCardData<String> {

    private String cardTitle;
    private Integer mainBackgroundResource;
    private Integer headBackgroundResource;
    private List<String> listItems;

    @Override
    public Integer getMainBackgroundResource() {
        return mainBackgroundResource;
    }

    @Override
    public Integer getHeadBackgroundResource() {
        return headBackgroundResource;
    }

    @Override
    public List<String> getListItems() {
        return listItems;
    }
}

public class MainActivity extends Activity {

   private ECPagerView ecPagerView;

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

       // Get pager from layout
       ecPagerView = (ECPagerView) findViewById(R.id.ec_pager_element);

       // Generate example dataset
       List<ECCardData> dataset = CardDataImpl.generateExampleData();

       // Implement pager adapter and attach it to pager view
       ecPagerView.setPagerViewAdapter(new ECPagerViewAdapter(getApplicationContext(), dataset) {
           @Override
           public void instantiateCard(LayoutInflater inflaterService, ViewGroup head, ListView list, ECCardData data) {
               // Data object for current card
               CardDataImpl cardData = (CardDataImpl) data;

               // Set adapter and items to current card content list
               list.setAdapter(new CardListItemAdapter(getApplicationContext(), cardData.getListItems()));
               // Also some visual tuning can be done here
               list.setBackgroundColor(Color.WHITE);

               // Here we can create elements for head view or inflate layout from xml using inflater service
               TextView cardTitle = new TextView(getApplicationContext());
               cardTitle.setText(cardData.getCardTitle());
               cardTitle.setTextSize(COMPLEX_UNIT_DIP, 20);
               FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.WRAP_CONTENT, FrameLayout.LayoutParams.WRAP_CONTENT);
               layoutParams.gravity = Gravity.CENTER;
               head.addView(cardTitle, layoutParams);

               // Card toggling by click on head element
               head.setOnClickListener(new View.OnClickListener() {
                   @Override
                   public void onClick(final View v) {
                       ecPagerView.toggle();
                   }
               });
           }
       });

       // Add background switcher to pager view
       ecPagerView.setBackgroundSwitcherView((ECBackgroundSwitcherView) findViewById(R.id.ec_bg_switcher_element));

   }

   // Card collapse on back pressed
   @Override
   public void onBackPressed() {
       if (ecPagerView.collapse())
           super.onBackPressed();
   }

}