title: How to retrieve XML attribute for custom control
body: <p>I've created a combo box control with a edittext and spinner. 
  I'm trying to let the android:prompt attribute be passed onto the 
  spinner, which means I need to catch it in the constructor which 
  passes my the AttributeSet and set it on the spinner. 
  I can't figure out how to get the value of the prompt. 
  I'm trying, </p>
  
  <pre><code>int[] ra = { android.R.attr.prompt };
  TypedArray ta = context.getTheme().obtainStyledAttributes(ra); 
  int id = ta.getResourceId(0, 0); 
  </code></pre>
  
  <p>I get back 0, which means it didn't find the attribute.
  I also did a ta.count() which returned 0. So I'm not getting anything back.</p>
  
  <p>My XML simply defines an android:prompt value.</p>
  
  <p>Thanks </p>