For consistency, based on @Gavin2058 's answer.
SpannableString sb = new SpannableString("Get Started!");
sb.setSpan(new TypefaceSpan("sans-serif"), 4, 11, Spannable.SPAN_EXCLUSIVE_INCLUSIVE);
yourTextView.setText(sb);
SPAN_EXCLUSIVE_INCLUSIVE
helps you add more setSpan
of the same style if you have a big string with multiple width words.