title: Android Theme style file merge
body: <p>Describe my situation in short, I have a multi themes project with <code>style.xml</code> and <code>style.xml(v21)</code>. The only difference of these two versions is that in each theme of v21 version has these two line in addition:<br>
  <code>&lt;item name="android:navigationBarColor"&gt;?attr/colorPrimaryDark&lt;/item&gt;
   &lt;item name="android:statusBarColor"&gt;?attr/colorPrimaryDark&lt;/item&gt;</code>   </p>
  
  <p>And I don't what two maintain two style files since they are too familiar, so is there any way I can merge these two style xml file ,or make the v21 one extends <code>style.xml</code> and when I what to make some modification, I only have to work with <code>style.xml</code></p>