What does the "?" mean in android style declarations

Question

Possible Duplicate:
Question mark (?) in XML attributes for Android

I have seen ? in android style declarations. For example...

 <Button
     android:id="@+id/gems_button"
     style="?buttonBarButtonStyle"
     android:layout_width="0dp"
     android:layout_height="wrap_content"
     android:layout_weight="1"
     android:text="@string/gems_button" />

What does the ? signify in the line style="?buttonBarButtonStyle"

I believe this means that the resource comes from a theme. – Code-Apprentice Jan 31 '13 at 00:13 — Code-Apprentice, Jan 31 '13 at 00:13

score 4 · Accepted Answer · answered Jan 31 '13 at 00:15

4

It's a reference to style attributes

A style attribute resource allows you to reference the value of an attribute in the currently-applied theme.

answered Jan 31 '13 at 00:15

Aaron He

5,509
3
34
44

1

Thanks @AaronHe. I somehow missed that in the Android docs! – neo108 Jan 31 '13 at 00:20

What does the "?" mean in android style declarations

1 Answers1