Overview

As 1 of the requirements of my Android application, iTransit, it has to automatically scroll to the row of the next bus in the schedule table.

The code

final View row = table.getChildAt(highlightRowPos); // Get the highlighted row.
scrollView.post(new Runnable() {
    @Override
    public void run() {
        scrollView.smoothScrollTo(0, row.getBottom()); // Scroll to the bottom of the row.
    }
});

The table is inside the scrollView. As I create the rows, I record the row positon of the highlighted row and save it in highlightRowPos variable. Then, I proceed to scroll to the highlighted line.

Notice that smoothScrollTo() is wrapped as a runnable and put in the queue through post(). It has to be done this way. Otherwise, row.getBottom() will return 0 and it will not scroll, position=0. By putting the scrolling action in the queue of the UI thread, it allows your action to run in the correct order.