//u Activity

Integer[] imageIDs = {
            R.drawable.pic1,
            R.drawable.pic2,
            R.drawable.pic3,
            R.drawable.pic4,
            R.drawable.pic5,
            R.drawable.pic6,
            R.drawable.pic7
};

// u onCreate

 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();
	                
	                //---display the images selected---
	                ImageView imageView = (ImageView) findViewById(R.id.image1);
	                imageView.setImageResource(imageIDs[position]);
	            }
	        });

// nakon onCreate u Activity

	 public class ImageAdapter extends BaseAdapter
	    {
	        Context context;
	        int itemBackground;

	        public ImageAdapter(Context c)
	        {
	            context = c;
	            //---setting the style---
	            TypedArray a = obtainStyledAttributes(R.styleable.Gallery1);            
	            
	            itemBackground = a.getResourceId(
	                R.styleable.Gallery1_android_galleryItemBackground, 0);                
	            
	            a.recycle();
	        }

	        //---returns the number of images---
	        public int getCount() {
	            return imageIDs.length;
	        }

	        
	        //---returns the item---
	        public Object getItem(int position) {
	            return position;
	        }

	         //---returns the ID of an item---
	        public long getItemId(int position) {
	            return position;
	        }      
	        
	        //---returns an ImageView view---
	        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;
	        }
	    }