Android rich text Mark Down

You don't need any extra library...

Just have a look into android.text.SpannableStringBuilder...

This will allow you to get text features like:

• Make it larger
• Bold
• Underline
• Italicize
• Strike-through
• Colored
• Highlighted
• Show as superscript
• Show as subscript
• Show as a link
• Make it clickable.

Here you have an example on how to apply a Bold style on a word in a TextView :

String text = "This is an example with a Bold word...";  

// Initialize a new SpannableStringBuilder instance
SpannableStringBuilder strb = new SpannableStringBuilder(text);

// Initialize a new StyleSpan to display bold text
StyleSpan bSpan = new StyleSpan(Typeface.BOLD);

// The index where to start applying the Bold Span
int idx = text.indexOf("Bold");

strb.setSpan(
                bSpan, // Span to add
                idx, // Start of the span
                idx + 4, // End of the span 
                Spanned.SPAN_EXCLUSIVE_EXCLUSIVE
        );

// Display the spannable text to yourTextView
yourTextView.setText(ssBuilder);        

I think you have to look for library that support mark down

1. https://github.com/tiagohm/MarkdownView
2. https://github.com/noties/Markwon
3. https://github.com/IonicaBizau/medium-editor-markdown

SpannableStringBuilder str = new SpannableStringBuilder("Your awesome text");
str.setSpan(new android.text.style.StyleSpan(android.graphics.Typeface.BOLD), start_int, end_int, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
TextView tv=new TextView(context);
tv.setText(str);