title: How to set icon for dialog in Android
body: <p>I want to customize a dialog in Android.
  I know how to set the title for dialog:</p>
  
  <pre><code>dialog.setTitle("O message");
  </code></pre>
  
  <p>Now I want to set the icon in front of the title.
  How can I achieve this?</p>
  
  <pre><code>Dialog dialog;
  dialog = new Dialog(this);
  dialog.setContentView(R.layout.layouterror22);      
  dialog.setTitle("O message");
  </code></pre>