title: Paralax effect in app background
body: <p>Im new in Android world. I want to put some parallax background effects in my app. </p>
  
  <p><strong>How can I do it? How to approach to this in Android?</strong></p>
  
  <p>Is there any productive way to create <strong>2-3 layer parallax</strong> background? Is there some tool, or class in android API?</p>
  
  <p>Or maybe I have to modify background image location or margins "manually" in code?</p>
  
  <p><strong>Im using API level 19.</strong></p>
  
  <p>I have tried to understand Paralloid library, but this is too big to understand without any explanation. Im new to Android and Java, im not familiar with all Layouts and other UI objects, however I'm familiar with MVC.</p>
  
  <p>I started bounty, maybe someone can explain step by step how that library works.</p>