title: Image used as source in ImageView: What sizes should I create?
body: <p>Its very clear for me what sizes should I use for the different versions of <code>ic_launcher.png</code> inside <code>drawable-hdpi</code>, <code>drawable-ldpi</code>, <code>drawable-mdpi</code>, etc.</p>
  
  <p>What I don't understand is what sizes should I use for a picture (a png) that is simply used in one Activity as an ImageView.</p>
  
  <ul>
  <li>I have this image in high resolution</li>
  <li>In a normal pocket device this image should be like 90% width</li>
  <li>In a tablet or larger devices, maybe 90% is too big</li>
  </ul>
  
  <p><img src="https://i.stack.imgur.com/8yzka.png" alt="enter image description here"></p>
  
  <p>So, the question is:
  <br>Should I create several versions of this <code>an_image-file.png</code> for each folder in drawable?  or just use a single version of it and adjust its width via XML? I'm asking because I'm worried about using the best practice in this subject.</p>