title: List of AdMob attributes used in xml and in extras
body: <p>Searching through the web didn't give me the reference to neither the attributes which may be used when setting up <strong>AdMob</strong>'s <code>AdView</code> in xml, nor the valid values used as <code>AdRequest.extras</code>.</p>
  
  <p>The official documentation on <a href="https://developers.google.com/mobile-ads-sdk/docs/android/banner_xml" rel="nofollow">AdView in XML</a> gives just following example:</p>
  
  <pre><code>&lt;com.google.ads.AdView android:id="@+id/adView"
                         android:layout_width="wrap_content"
                         android:layout_height="wrap_content"
  
                         ads:adUnitId="MY_AD_UNIT_ID"
                         ads:adSize="BANNER"
                         ads:testDevices="TEST_EMULATOR, TEST_DEVICE_ID"
                         ads:loadAdOnCreate="true"/&gt;
  </code></pre>
  
  <p>While the <a href="https://developers.google.com/mobile-ads-sdk/docs/bestpractices#adcolors" rel="nofollow">guide on extras</a> specifies just following values:</p>
  
  <pre><code>color_bg        Background color
  color_bg_top    Gradient background color at top
  color_border    Border color
  color_link      Link text color
  color_text      Text color
  color_url       URL color
  </code></pre>
  
  <p>So, are these values the only possible way to customize (not considering <code>Targeting</code>) the <code>AdView</code> and <code>AdRequest</code> or are there any unmentioned values/attributes?</p>