GridViewCustomAdapter.java

package com.google.mcommerce.sample.android.chapter04.adapterView;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;

import com.google.mcommerce.sample.android.R;

public class GridViewCustomAdapter extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.c04_gridviewcustom);

		GridView gv = (GridView) findViewById(R.id.gridview);

		ManateeAdapter adapter = new ManateeAdapter(this);

		gv.setAdapter(adapter);
	}

	public static class ManateeAdapter extends BaseAdapter {
		private static final String TAG = "ManateeAdapter";
		private static int convertViewCounter = 0;
		private Context mContext;
		private LayoutInflater mInflater;

		static class ViewHolder {
			ImageView image;
		}

		private int[] manatees = { R.drawable.manatee00, R.drawable.manatee01,
				R.drawable.manatee02, R.drawable.manatee03,
				R.drawable.manatee04, R.drawable.manatee05,
				R.drawable.manatee06, R.drawable.manatee07,
				R.drawable.manatee08, R.drawable.manatee09,
				R.drawable.manatee10, R.drawable.manatee11,
				R.drawable.manatee12, R.drawable.manatee13,
				R.drawable.manatee14, R.drawable.manatee15,
				R.drawable.manatee16, R.drawable.manatee17,
				R.drawable.manatee18, R.drawable.manatee19,
				R.drawable.manatee20, R.drawable.manatee21,
				R.drawable.manatee22, R.drawable.manatee23,
				R.drawable.manatee24, R.drawable.manatee25,
				R.drawable.manatee26, R.drawable.manatee27,
				R.drawable.manatee28, R.drawable.manatee29,
				R.drawable.manatee30, R.drawable.manatee31,
				R.drawable.manatee32, R.drawable.manatee33 };

		private Bitmap[] manateeImages = new Bitmap[manatees.length];
		private Bitmap[] manateeThumbs = new Bitmap[manatees.length];

		public ManateeAdapter(Context context) {
			Log.v(TAG, "Constructing ManateeAdapter");
			this.mContext = context;
			mInflater = LayoutInflater.from(context);

			for (int i = 0; i < manatees.length; i++) {
				manateeImages[i] = BitmapFactory.decodeResource(
						context.getResources(), manatees[i]);
				manateeThumbs[i] = Bitmap.createScaledBitmap(manateeImages[i],
						100, 100, false);
			}
		}

		public int getCount() {
			Log.v(TAG, "in getCount()");
			return manatees.length;
		}

		public int getViewTypeCount() {
			Log.v(TAG, "in getViewTypeCount()");
			return 1;
		}

		public int getItemViewType(int position) {
			Log.v(TAG, "in getItemViewType() for position " + position);
			return 0;
		}

		public View getView(int position, View convertView, ViewGroup parent) {
			ViewHolder holder;

			Log.v(TAG, "in getView for position " + position
					+ ", convertView is "
					+ ((convertView == null) ? "null" : "being recycled"));

			if (convertView == null) {
				convertView = mInflater.inflate(R.layout.c04_gridimage, null);
				convertViewCounter++;
				Log.v(TAG, convertViewCounter
						+ " convertViews have been created");

				holder = new ViewHolder();
				holder.image = (ImageView) convertView
						.findViewById(R.id.gridImageView);

				convertView.setTag(holder);
			} else {
				holder = (ViewHolder) convertView.getTag();
			}

			holder.image.setImageBitmap(manateeImages[position]);

			return convertView;
		}

		public Object getItem(int position) {
			Log.v(TAG, "in getItem() for position " + position);
			return manateeImages[position];
		}

		public long getItemId(int position) {
			Log.v(TAG, "in getItemId() for position " + position);
			return position;
		}
	}
}