dimens.xml

<resources> 
    <!-- Example customization of dimensions originally defined in res/values/dimens.xml 
         (such as screen margins) for screens with more than 820dp of available width. This 
         would include 7" and 10" devices in landscape (~960dp and ~1280dp respectively). --> 
    <dimen name="activity_horizontal_margin">64dp</dimen> 
</resources>