HorizontalScrollView: auto-scroll to end when new Views are added?

I have a HorizontalScrollView containing a LinearLayout. On screen I have a Button that will add new Views to the LinearLayout at runtime, and I'd like the scroll view to scroll to the end of the list when a new View is added.

I almost have it working - except that it always scrolls one view short of the last view. It seems like it's scrolling without first calculating the inclusion of the new view.

In my app I am using a custom View object, but I made a small test application that uses ImageView and has the same symptom. I tried various things like requestLayout() on both the Layout and ScrollView, I tried scrollTo(Integer.MAX_VALUE) and it scrolled into the netherverse :) Am I violating a UI thread issue or something?

• Rick

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    public class Main extends Activity {
        /** Called when the activity is first created. */
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);

             Button b = (Button) findViewById(R.id.addButton);
             b.setOnClickListener(new AddListener());

             add();
        }

        private void add() {
             LinearLayout l = (LinearLayout) findViewById(R.id.list);
             HorizontalScrollView s = 
                 (HorizontalScrollView) findViewById(R.id.scroller);

             ImageView i = new ImageView(getApplicationContext());
             i.setImageResource(android.R.drawable.btn_star_big_on);
             l.addView(i);

             s.fullScroll(HorizontalScrollView.FOCUS_RIGHT);
        }

        private class AddListener implements View.OnClickListener {
             @Override
             public void onClick(View v) {
                 add();
             }
        }
    }

Layout XML:

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://sch