title: Usage of ?android:attr/ in backwards compatible apps
body: <p>I'm trying to make my ICS (API level 15) app compatible with Gingerbread (API level 10), and I'm getting <code>InflateException Error inflating class &lt;Unknown&gt;</code> for any layout XML that has an <code>?android:attr/</code> attribute. If I comment out these attributes I can compile and run the app, but then it, of course, looks aweful.</p>
  
  <p>I'd rather not duplicate all of the items from <code>android.R.attr</code> that I'm using, but at the moment I'm lost as to another way to do it.</p>
  
  <p>I'm using ActionBarSherlock to get the ActionBar working, and I don't seem to be using anything else that requires the support library (although I've included it during the process of trying to figure this out), it's just these theme-based resources that I'm stuck on.</p>
  
  <p>Some of the theme resources I'm using are:</p>
  
  <p><code>
  ?android:attr/textColorSecondaryInverse
  ?android:attr/textAppearanceLarge
  ?android:attr/dividerVertical
  ?android:attr/selectableItemBackground
  ?android:attr/textAppearanceMedium
  ?android:attr/dividerVertical
  ?android:attr/dividerHorizontal
  </code></p>