Android Studio Tutorials |how to style a substring in android studio | Spannable Text
Spans are powerful markup objects that you can use to style text at the character or paragraph level.
By attaching spans to text objects, you can change text in a variety of ways, including adding color,
making the text clickable,
scaling the text size,
and drawing text in a customized way.
Spans can also change TextPaint properties, draw on a Canvas, and change text layout.