How to make ListView's scroll slower when using smoothScrollToPosition() function?

Scroll of my ListView is very fast when using smoothScrollToPosition(int position) function. I want to customize this and want to make it slower.

I tried set android:fastscrollenabled="false" and setFriction(ViewConfiguration.getScrollFriction() * 5) but don't solve this problem. Can someone help me? Any help will be greatly appreciated! Thank in advanced :)