title: How to get the default alert Dialog on android have a black theme
body: <p>How do you get the black themed Dialog in android like shown on the android guide <a href="http://developer.android.com/guide/topics/ui/dialogs.html" rel="noreferrer">http://developer.android.com/guide/topics/ui/dialogs.html</a></p>
  
  <p>I took a screen shot. Whenever I use Alert Dialog, I get the dialog on the left, I want the one on the right.</p>
  
  <p><img src="https://i.stack.imgur.com/kfLke.png" alt="enter image description here"></p>