title: how to change font size dynamically at runtime?
body: <p>I have one spinner which has some font size 14dp,16dp etc. when i select value from spinner
  I want to change font size in text view for all activity of application at run time. 
  IS this possible?</p>
  
  <p>I refer several answer but it doesn't work for me..</p>
  
  <p><a href="https://stackoverflow.com/questions/3241729/android-dynamically-change-style-at-runtime">android dynamically change style at runtime</a> </p>