When you start Angry Birds and hit play you are shown a horizontally scrolling menu with a centered line of images that once clicked on you can start the game and what not.
You can do that using an Gallery, and in your adapter you add the TouchListeners to the ImageViews from each item. This is the best way, cause the Gallery will give support to each image get centered when you are scrolling. With HorizontalScrollView you got only scroll with fling, and the items of your menu will not be centralized.