title: How to support different Android versions?
body: <p>I found that from API 19+ their is a small change in code and it doesn't appear in API 19-.
  How can I support both android versions in the same app? </p>
  
  <p>EDIT: The are feature that exists only in android 4.1.2 and in versions below 4.1.2 they doesn't exists.</p>
  
  <p>How can I make an app that support both versions with the exception that in lower version the "new" features won't exist? (its hard for me to explain)</p>