而不是直接调用scrollTo,我们必须在ScrollView上调用post.这个工作.

t.setText(aVeryLongString);
s.post(new Runnable() {
    @Override
    public void run() {
        int y = t.getLayout().getLineTop(40); // e.g. I want to scroll to line 40
        s.scrollTo(0,y);
    }
});