samples/Home/res/values/attrs.xml

<?xml version="1.0" encoding="utf-8"?>
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/* Copyright 2007, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
**     http://www.apache.org/licenses/LICENSE-2.0
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** See the License for the specific language governing permissions and
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<resources>
    <declare-styleable name="ApplicationsStackLayout">
        <attr name="stackOrientation">
            <enum name="horizontal" value="0" />
            <enum name="vertical" value="1" />
        </attr>
        <attr name="marginLeft" format="dimension"  />
        <attr name="marginTop" format="dimension"  />
        <attr name="marginRight" format="dimension"  />
        <attr name="marginBottom" format="dimension"  />
    </declare-styleable>
</resources>