title: Translucent activity & DialogFragment = Background around still shown
body: <p>I have a FragmentActivity that makes at the beginning a fragment transacation loading a DialogFragment which builds an AlertDialog. The theme of the Activity is set to @android:style/Theme.Translucent.NoTitleBar.
  I tried all and I am not being able to show the DialogFragment without the background around.</p>
  
  <p>Please do not care about the red ones, I only obfuscated my app. The green color is the problem is the backgound that I want to get rid of, if I set the color to Transparent, it is still shown in white.</p>
  
  <p><img src="https://i.stack.imgur.com/UETXP.png" alt="enter image description here"></p>