Yeah, that thread does have some good info about using platform icons:

http://groups.google.com/group/android-developers/browse_thread/thread/a2fdf66cb6ac865a/efe75cb9d8a1f20d?lnk=gst&q=android+icons#efe75cb9d8a1f20d

On Mar 29, 2:08 pm, Brian <[email protected]> wrote:
> That worked, thanks.
>
> I'll look for that thread on android-developers.
>
> On Mar 29, 2:03 pm, Mark Murphy <[email protected]> wrote:
>
>
>
> > Brian wrote:
> > > How do you specify an Android icon in xml?  I'm trying to make a menu
> > > with an "Add" button using the stock Android Add icon, like so:
>
> > >     <item android:id="@+id/menu_add"
> > >         android:title="Add"
> > >         android:icon="@drawable/ic_menu_add" /
> > >>                              // Doesn't work.
> > >         android:icon="@drawable/android.R.drawable.ic_menu_add" /> //
> > > Also doesn't work.
> > >         android:icon="@android.R.drawable/ic_menu_add" /
> > >>               // Also doesn't work.
>
> > > As you can see, I'm not sure how to re-use the android "Add" icon in
> > > my xml (without copying it & pasting it in my app, or setting it
> > > programatically I suppose)
>
> > > I know the icon exists, as I can do  this on a dialog:
> > >  .setIcon(android.R.drawable.ic_menu_add)
>
> > Try android:icon="@android:drawable/ic_menu_add"
>
> > Note that there was an extended thread on [android-developers] not that
> > long ago, where we were given official advice to be careful when
> > referencing internal graphics like that. Different devices will have
> > different themes, and so the icons will change look. If you need the
> > icon to keep consistent (e.g., to match other icons you are drawing),
> > make yourself a local copy of the image.
>
> > --
> > Mark Murphy (a Commons 
> > Guy)http://commonsware.com|http://twitter.com/commonsguy
>
> > Warescription: Three Android Books, Plus Updates, $35/Year
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