title: Transparent adaptive icon background
body: <p>So I have been working on this app for a couple weeks and I started to build the icon. I have Android Studio 3.0.1 and they seem to have changed the way Image Assets are made, now they have adaptive icons. I made an icon with transparent background for my app. Before, I would just change the shape to "none" and there would be no background generated. But now that is not an option unless I go to "legacy" which is useless. The background color does not seem to support transparency. Even if in the <code>ic_launcher.xml</code> I set the background to a transparent color but the icon still appears with a black background.</p>
  
  <p>Here is my <code>ic_lancher.xml</code></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android"&gt;
      &lt;background android:drawable="@color/transparent"/&gt;
      &lt;foreground android:drawable="@mipmap/ic_launcher_foreground"/&gt;
  &lt;/adaptive-icon&gt;
  </code></pre>
  
  <p>And ic_launcher_round.xml is the same. The <code>@color/transparent</code> bit is a this: </p>
  
  <pre><code>&lt;color name="transparent"&gt;#00000000&lt;/color&gt;
  </code></pre>