make Scrollview scroll down automatically

Question

hello, I have a chat application but as it goes with messages the user is obliged to see tds messages typed from the first, he should scroll the bar until the end to see the last message, already researched some ways to solve it but I did not find. the solution I found was this:

      scrollViewObject.postDelayed(new Runnable() {
        @Override
        public void run() {
            scroll.fullScroll(ScrollView.FOCUS_UP);
        }
    }, 600);

but of error. someone can help me?