SpannableStringBuilder to create String with multiple fonts/text sizes etc Example?

Question

I need to create a String placed in a TextView that will display a string like this:

First Part Not Bold BOLD rest not bold

Answer 1

This code should set to bold everything that comes inside the html bold tag. And it also deletes the tag so only the content inside is displayed.

        SpannableStringBuilder sb = new SpannableStringBuilder("this is bold and this is bold too  and this is bold too, again.");

        Pattern p = Pattern.compile(".*?", Pattern.CASE_INSENSITIVE);            
        boolean stop = false;
        while (!stop)
        {
            Matcher m = p.matcher(sb.toString());
            if (m.find()) {
                sb.setSpan(new StyleSpan(android.graphics.Typeface.BOLD), m.start(), m.end(), Spannable.SPAN_INCLUSIVE_INCLUSIVE);
                sb.delete(m.end()-4, m.end());
                sb.delete(m.start(), m.start() + 3);
            }
            else
                stop = true;
        }

This code can also be adapted for other html style tags, such as Superscript (sup tag), etc.

        SpannableStringBuilder sb = new SpannableStringBuilder("text has superscript tag");

        Pattern p = Pattern.compile(".*?", Pattern.CASE_INSENSITIVE);            
        boolean stop = false;
        while (!stop)
        {
            Matcher m = p.matcher(sb.toString());
            if (m.find()) {
                sb.setSpan(new SuperscriptSpan(), m.start(), m.end(), Spannable.SPAN_INCLUSIVE_INCLUSIVE);
                sb.delete(m.end()-6, m.end());
                sb.delete(m.start(), m.start() + 5);
            }
            else
                stop = true;
        }

To set the color, just use the ForegroundColorSpan with setSpan.

sb.setSpan(new ForegroundColorSpan(Color.rgb(255, 0, 0)), m.start(), m.end(), Spannable.SPAN_INCLUSIVE_INCLUSIVE);

Hope it helps.