title: What is "Resources" in BitmapDrawable constructor really?
body: <p>As the parameterless <code>BitmapDrawable</code>constructor is deprecated, we have to give resource id to the constructor.</p>
  
  <pre><code>BitmapDrawable bitmapDrawable = new BitmapDrawable(res, bmap);
  </code></pre>
  
  <p>Where <code>res</code> is generally <code>getResources()</code>.</p>
  
  <p>Why does the constructor need it and how can we define that value if we are using a general image cache?</p>