title: I need to test my app on different virtual devices
body: <p>So I'm currently helping to develop an app and I've been asked to test it on as many devices (virtual/non virtual) as possible and then make it adjust it to as many different screen sizes and even tablets as possible. </p>
  
  <p>Now I'm not sure where exactly to start because I don't know if Android Virtual Device Manager in Eclipse has every possible screen combination.</p>
  
  <p>So, would setting up and running all of the 21 virtual devices in Eclipse do the job? Or is there something else I should try doing? Any kind of information would be helpful, thank you!</p>