Scroll a ListView by pixels in Android

Question

I want to scroll the a ListView in Android by number of pixels. For example I want to scroll the list 10 pixels down (so that the first item on the list has its top 10 pixel rows hidden).

I thought the obviously visible scrollBy or scrollTo methods on ListView would do the job, but they don't, instead they scroll the whole list wrongly (In fact, the getScrollY always return zero even though I have scrolled the list using my finger.)

What I'm doing is I'm capturing Trackball events and I want to scroll the listview smoothly according to the motion of the trackball.