<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".GalleryActivity" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Images of San Francisco" />

      <Gallery
        android:id="@+id/gallery1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
    
    <ImageView
        android:id="@+id/image1"
        android:layout_width="320dp"
        android:layout_height="250dp"
        android:scaleType="fitXY" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="Gallery1">
<attr name="android:galleryItemBackground" />
</declare-styleable>
</resources>

package net.learn2develop.Gallery;

import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.Toast;

public class GalleryActivity extends Activity {
	Integer[] imageIDs = {
			R.drawable.pic1,
			R.drawable.pic2,
			R.drawable.pic3,
			R.drawable.pic4,
			R.drawable.pic5,
			R.drawable.pic6,
			R.drawable.pic7
	};

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
	
	Gallery gallery = (Gallery) findViewById(R.id.gallery1);
	
	gallery.setAdapter(new ImageAdapter(this));
	gallery.setOnItemClickListener(new OnItemClickListener()
	{
		public void onItemClick(AdapterView parent, View v,
				int position, long id)
		{
			Toast.makeText(getBaseContext(),
					"pic" + (position + 1) + " selected",
							Toast.LENGTH_SHORT).show();
		}
	});
}

public class ImageAdapter extends BaseAdapter
{
	Context context;
	int itemBackground;
	
	public ImageAdapter(Context c)
	{
		context = c;
		TypedArray a = obtainStyledAttributes(
				R.styleable.Gallery1);
		itemBackground = a.getResourceId(
				R.styleable.Gallery1_android_galleryItemBackground,
				0);
		a.recycle();
	}
	
	public int getCount() {
		return imageIDs.length;
	}
	
	public Object getItem(int position) {
		return position;
	}
	
	public long getItemId(int position) {
		return position;
	}
	
	public View getView(int position, View convertView,
			ViewGroup parent) {
		ImageView imageView;
		if (convertView == null) {
			imageView = new ImageView(context);
			imageView.setImageResource(imageIDs[position]);
			imageView.setScaleType(
					ImageView.ScaleType.FIT_XY);
			imageView.setLayoutParams(
					new Gallery.LayoutParams(150, 120));
		} else {
			imageView = (ImageView) convertView;
		}
		imageView.setBackgroundResource(itemBackground);
		return imageView;
	}
	
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.gallery, menu);
		return true;

	}
}
}