title: Shape drawable as background, a line at the bottom
body: <p>I am using a drawable as a background of a TextView just to have a divider line below the text. A achivied it with this drawable-xml:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;layer-list xmlns:android="http://schemas.android.com/apk/res/android" &gt;
      &lt;item&gt;
          &lt;shape 
          android:shape="rectangle"&gt;
              &lt;solid android:color="#FFDDDDDD" /&gt;
              &lt;gradient 
                  android:angle="0"
                  android:startColor="#FFAAAAAA"
                  android:endColor="#FFEEEEEE"
                  /&gt;
          &lt;/shape&gt;
      &lt;/item&gt;
  
      &lt;item android:bottom="2dp"&gt;
          &lt;shape 
          android:shape="rectangle"&gt;
              &lt;solid android:color="#FF000000" /&gt;
          &lt;/shape&gt;
      &lt;/item&gt;
  
  &lt;/layer-list&gt;
  </code></pre>
  
  <p>But this method draws a colored rectangle above a black rectangle. I would like to have just the line at the bottom of the shape with no black rectangle because black is not transparent. How could I achieve that?</p>