MyCustomAdapter.java

package com.pinecone.technology.mcommerce.learning.android.chapter10.search;

import java.util.ArrayList;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

public class MyCustomAdapter extends BaseAdapter {
	private ArrayList<String> mListItems;
	private LayoutInflater mLayoutInflater;

	public MyCustomAdapter(Context context, ArrayList<String> arrayList) {

		mListItems = arrayList;

		// get the layout inflater
		mLayoutInflater = (LayoutInflater) context
				.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	}

	@Override
	public int getCount() {
		// getCount() represents how many items are in the list
		return mListItems.size();
	}

	@Override
	// get the data of an item from a specific position
	// i represents the position of the item in the list
	public Object getItem(int i) {
		return null;
	}

	@Override
	// get the position id of the item from the list
	public long getItemId(int i) {
		return 0;
	}

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

		// create a ViewHolder reference
		ViewHolder holder;

		// check to see if the reused view is null or not, if is not null then
		// reuse it
		if (view == null) {
			holder = new ViewHolder();

			view = mLayoutInflater.inflate(R.layout.list_item, null);
			holder.itemName = (TextView) view
					.findViewById(R.id.list_item_text_view);

			// the setTag is used to store the data within this view
			view.setTag(holder);
		} else {
			// the getTag returns the viewHolder object set as a tag to the view
			holder = (ViewHolder) view.getTag();
		}

		// get the string item from the position "position" from array list to
		// put it on the TextView
		String stringItem = mListItems.get(position);
		if (stringItem != null) {
			if (holder.itemName != null) {
				// set the item name on the TextView
				holder.itemName.setText(stringItem);
			}
		}

		// this method must return the view corresponding to the data at the
		// specified position.
		return view;

	}

	/**
	 * Static class used to avoid the calling of "findViewById" every time the
	 * getView() method is called, because this can impact to your application
	 * performance when your list is too big. The class is static so it cache
	 * all the things inside once it's created.
	 */
	private static class ViewHolder {

		protected TextView itemName;

	}
}