title: Colored boxed with letters a la Gmail
body: <p>I wondered how they are generated and if they are generated everytime I open the app or are stored (cached).</p>
  
  <p>It's just a canvas (programmatically) or they use XML? Something like this, and then programmatically they add the letter:</p>
  
  <pre><code>&lt;shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"&gt;
      &lt;size android:width="1px" android:height="1dp"/&gt;
      &lt;solid android:color="#FFFFF5EE/&gt;
  &lt;/shape&gt;
  </code></pre>