Chenge Font Android Studio

change font Family in java App (android studio).
  
<?xml version="1.0" encoding="utf-8"?>
<resources>
   <style name="AppTheme" perent="Theme.AppCompat.Light.DarkActionBar">
       <item name="android:fontFamily">@font/font_name</item> // fontFamily
   </style>
</resources>
Kind Kea