code: public static void measure(@NonNull TextView textView, @NonNull CharSequence text) {
  
          if (!(text instanceof Spanned)) {
              // nothing to do here
              return;
          }
  
          final OrderedListItemSpan[] spans = ((Spanned) text).getSpans(
                  0,
                  text.length(),
                  OrderedListItemSpan.class);
  
          if (spans != null) {
              final TextPaint paint = textView.getPaint();
              for (OrderedListItemSpan span : spans) {
                  span.margin = (int) (paint.measureText(span.number) + .5F);
              }
          }
      }
docs: Process supplied `text` argument and supply TextView paint to all OrderedListItemSpans
  in order for them to measure number.
  <p>
  NB, this method must be called <em>before</em> setting text to a TextView (`TextView#setText`
  internally can trigger new Layout creation which will ask for leading margins right away)
  
  @param textView to which markdown will be applied
  @param text     parsed markdown to process
  @since 2.0.1