How to design a shelf view in android?

package com.onazifi.shelf;

import java.util.ArrayList;

import com.onazifi.shelf.BookItem;
import com.onazifi.shelf.HorizontalListView;
import com.onazifi.shelf.Library;
import com.onazifi.shelf.R;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class ShelfViewActivity extends Activity {
	private VerticalAdapter verListAdapter;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.id.activity_main);
		
		
		/*
		 * Calling Library & BookItem classes for create list of groups
		 *  groupbyArrayBookItem return back array of array of items
		 */
		Library lb = new Library();
		for (BookItem item : BookItem.ALL_BOOKS) {
			lb.addBookItem(item);
		}
		ArrayList<arraylist><bookitem>> groupList = new ArrayList<arraylist><bookitem>>();
		groupList = lb.groupbyArrayBookItem(Library.AUTHOR);

		verListAdapter = new VerticalAdapter(this, R.layout.row, groupList);
		setListAdapter(verListAdapter);

		verListAdapter.notifyDataSetChanged();
		
	}

	private void setListAdapter(VerticalAdapter verListAdapter2) {
		// TODO Auto-generated method stub
		
	}

	private class VerticalAdapter extends ArrayAdapter<arraylist><bookitem>> {

		private int resource;

		public VerticalAdapter(Context _context, int _ResourceId,
				ArrayList<arraylist><bookitem>> _items) {
			super(_context, _ResourceId, _items);
			this.resource = _ResourceId;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			View rowView;

			if (convertView == null) {
				rowView = LayoutInflater.from(getContext()).inflate(resource,
						null);
			} else {
				rowView = convertView;
			}

			HorizontalListView hListView = (HorizontalListView) rowView
					.findViewById(R.id.subListview);
			HorizontalAdapter horListAdapter = new HorizontalAdapter(
					getContext(), R.layout.item, getItem(position));
			hListView.setAdapter(horListAdapter);

			return rowView;
		}
	}

	/*
	 * This class add some items to Horizontal ListView this ListView include
	 * several bookItem.
	 */
	public class HorizontalAdapter extends ArrayAdapter<bookitem> {

		private int resource;

		public HorizontalAdapter(Context _context, int _textViewResourceId,
				ArrayList<bookitem> _items) {
			super(_context, _textViewResourceId, _items);
			this.resource = _textViewResourceId;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			View retval = LayoutInflater.from(getContext()).inflate(
					this.resource, null);

			TextView topText = (TextView) retval.findViewById(R.id.title);
			TextView bottomText = (TextView) retval
					.findViewById(R.id.author);

			topText.setText(getItem(position).getAuthor());
			bottomText.setText(getItem(position).getTitle());

			return retval;
		}
	}

}

package com.onazifi.shelf;

import java.util.ArrayList;

import com.onazifi.shelf.BookItem;
import com.onazifi.shelf.HorizontalListView;
import com.onazifi.shelf.Library;
import com.onazifi.shelf.R;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class ShelfViewActivity extends Activity {
	private VerticalAdapter verListAdapter;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.id.activity_main);
		
		
		/*
		 * Calling Library & BookItem classes for create list of groups
		 *  groupbyArrayBookItem return back array of array of items
		 */
		Library lb = new Library();
		for (BookItem item : BookItem.ALL_BOOKS) {
			lb.addBookItem(item);
		}
		ArrayList<arraylist><bookitem>> groupList = new ArrayList<arraylist><bookitem>>();
		groupList = lb.groupbyArrayBookItem(Library.AUTHOR);

		verListAdapter = new VerticalAdapter(this, R.layout.row, groupList);
		setListAdapter(verListAdapter);

		verListAdapter.notifyDataSetChanged();
		
	}

	private void setListAdapter(VerticalAdapter verListAdapter2) {
		// TODO Auto-generated method stub
		
	}

	private class VerticalAdapter extends ArrayAdapter<arraylist><bookitem>> {

		private int resource;

		public VerticalAdapter(Context _context, int _ResourceId,
				ArrayList<arraylist><bookitem>> _items) {
			super(_context, _ResourceId, _items);
			this.resource = _ResourceId;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			View rowView;

			if (convertView == null) {
				rowView = LayoutInflater.from(getContext()).inflate(resource,
						null);
			} else {
				rowView = convertView;
			}

			HorizontalListView hListView = (HorizontalListView) rowView
					.findViewById(R.id.subListview);
			HorizontalAdapter horListAdapter = new HorizontalAdapter(
					getContext(), R.layout.item, getItem(position));
			hListView.setAdapter(horListAdapter);

			return rowView;
		}
	}

	/*
	 * This class add some items to Horizontal ListView this ListView include
	 * several bookItem.
	 */
	public class HorizontalAdapter extends ArrayAdapter<bookitem> {

		private int resource;

		public HorizontalAdapter(Context _context, int _textViewResourceId,
				ArrayList<bookitem> _items) {
			super(_context, _textViewResourceId, _items);
			this.resource = _textViewResourceId;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			View retval = LayoutInflater.from(getContext()).inflate(
					this.resource, null);

			TextView topText = (TextView) retval.findViewById(R.id.title);
			TextView bottomText = (TextView) retval
					.findViewById(R.id.author);

			topText.setText(getItem(position).getAuthor());
			bottomText.setText(getItem(position).getTitle());

			return retval;
		}
	}

}