title: Best practices for targetting a wide range of devices and screen sizes
body: <p>As you know android today is many versions many  constructors, many screen sizes,...</p>
  
  <p>it's quite difficult for developers today to write programs that targets a big part of devices.</p>
  
  <p>What would be THE developer must-know practices for this ?</p>
  
  <ul>
  <li>tips for fluid layouts.</li>
  <li>"standards" for developing on any android version.</li>
  <li>...</li>
  </ul>
  
  <p>Any other ideas ?</p>