android 自定义Gallery

public class DetailGallery extends Gallery {

	public DetailGallery(Context context, AttributeSet attrSet) {
		super(context, attrSet);
	}

	private boolean isScrollingLeft(MotionEvent e1, MotionEvent e2) {
		return e2.getX() > e1.getX();
	}

	@Override
	public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
			float velocityY) {
		int kEvent;
		if (isScrollingLeft(e1, e2)) {
			// Check if scrolling left
			kEvent = KeyEvent.KEYCODE_DPAD_LEFT;
		} else {
			// Otherwise scrolling right
			kEvent = KeyEvent.KEYCODE_DPAD_RIGHT;
		}
		onKeyDown(kEvent, null);
		return true;

 达到一次滑动一张图片的效果