title: Android: make everything around Dialog darker than default
body: <p>i have a custom dialog with following style:</p>
  
  <pre><code>&lt;style name="webtogo_app_style"  parent="@android:style/Theme.Dialog"&gt;
      &lt;item name="android:windowNoTitle"&gt;true&lt;/item&gt;
      &lt;item name="android:windowBackground"&gt;@android:color/transparent&lt;/item&gt;
  &lt;/style&gt;
  </code></pre>
  
  <p>It shows a borderless dialog, and anything behind gets (slightly) darker. My designer wants that everything behind got ever more dark than Android's default, but not completely black.</p>
  
  <p>Is there a setting for this at all? </p>
  
  <p>The only workaround I can think of is to use a full-screen activity instead of a dialog and just fill up the whole screen with semitransparent color (e.g. #99000000) and then draw my dialog over it. Is there an easier way?</p>
  
  <p>Thanks!</p>