title: Prevent Proguard to remove specific drawables
body: <p>In my Android project, I have some images stored in res/drawable/ which are accessed <strong>only</strong> from an HTML file loaded in a Webview. For example (code in HTML):</p>
  
  <pre><code>&lt;img src="file:///android_res/drawable/myfriend.png"&gt;
  </code></pre>
  
  <p><strong>These images are removed by Proguard from apk during optimization.</strong></p>
  
  <p>Does somebody know a way to keep these files (even if they are not used directly in the java code)?</p>