I've seen this in the Gallery API Demo shipping with the SDK.
There is an attrs.xml holding declare-stylable tags, and the gallery
adapter then does this:
in attrs.xml:
<declare-styleable name="Gallery1">
<attr name="android:galleryItemBackground" />
</declare-styleable>
in Gallery1.java:
// See res/values/attrs.xml for the <declare-styleable>
that defines
// Gallery1.
TypedArray a = obtainStyledAttributes
(R.styleable.Gallery1);
mGalleryItemBackground = a.getResourceId(
R.styleable.Gallery1_android_galleryItemBackground, 0);
a.recycle();
...
// The preferred Gallery item background
i.setBackgroundResource(mGalleryItemBackground);
I couldn't find any point in the code where the background resource is
set to an actual value. There is a gallery_background_1 drawable
defined, but it's nowhere used (at least Eclipse search didn't find
any references to it).
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