preferencecategory background width isn't right
<p>my app is on Android 4.0 ,in the setting module,the background image of <code>preferencecategory</code> doesn't match the full screen width.it's only aligning the <code>listitem</code> width.I don't know how to change it so it's can fill the width of full screen.any help and guide will be appreciate.thank you.</p>
