title: confusion about drawable-hdpi,drawable-mdpi,drawable-ldpi and drawable
body: <p>I am on one really big project that was started sins the time of android 1.5.</p>
  
  <p>This project evolved as android was evolving and at this point supports 2.3 and above.</p>
  
  <p>Now I got this problem I have a lot of drawables in drawable-hdpi,drawable-mdpi,drawable-ldpi but also in drawable folder.</p>
  
  <p>Generally the concept of this 3 folders(drawable-hdpi,drawable-mdpi,drawable-ldpi) it is clear to me but my confusion comes with the images in drawable folder.</p>
  
  <p>for example I have an image named myimage.png and this image is present in drawable-hdpi,drawable-mdpi,drawable-ldpi folders with resolution 72x72,48x48,36x36 respectively but this image is also present in drawable folder.</p>
  
  <p>My question is why ? when does the image from drawable folder is used ? is this image forgotten to be removed ? of it is used in some cases ? I have tried to remove this image and the application works just fine. I also have put just a green color with resolution 72x72 and this image is never drawn</p>
  
  <p>so can someone clarify me the existence of the drawable folder ?</p>
  
  <p>I know that if I do not have the dhpi,mdpi and ldpi folders then I need to put the images in drawable but what is the point of images in drawable when this 3 folders are present ?</p>
  
  <p>Thanks</p>
  
  <p><strong>EDIT</strong></p>
  
  <p>one more question, what if I have image in drawable-hdpi but not in ldpi and not i mdpi. Let say we have phone with mdpi resolution density... What will happen ?</p>