title: How to make transparent Activity with 50% transparency
body: <p>I have a transparent theme Activity but this theme will make the Activity 100% transparent.
  I need a code such that the Activity will be 50% Transparent. This is my code:
  </p>
  
  <pre><code>&lt;item name="android:windowIsTranslucent"&gt;true&lt;/item&gt;
      &lt;item name="android:windowBackground"&gt;@android:color/transparent&lt;/item&gt;
      &lt;item name="android:windowContentOverlay"&gt;@null&lt;/item&gt;
      &lt;item name="android:windowNoTitle"&gt;true&lt;/item&gt;
      &lt;item name="android:windowIsFloating"&gt;true&lt;/item&gt;
      &lt;item name="android:backgroundDimEnabled"&gt;false&lt;/item&gt;
  &lt;/style&gt;
  </code></pre>