custom_rules.xml

<?xml version="1.0" encoding="UTF-8"?>
<project>

    <macrodef name="apply-dirty-integer">
        <attribute name="source"/>
        <sequential>
            <copy overwrite="true" file="@{source}" tofile="@{source}.tmp">
                <filterchain>
                    <tokenfilter>
                        <replaceregex
                                pattern="(\w+) int (\w+)\s*=\s*0x([0-9-a-f]{8});"
                                replace="\1 int \2 = Integer.valueOf(0x\3);"/>
                    </tokenfilter>
                </filterchain>
            </copy>
            <move file="@{source}.tmp" tofile="@{source}"/>
        </sequential>
    </macrodef>

    <!-- Basically changes resource definition
    from:
        public static final int field = xxxxxxxx;
    to
        public static final int field = Integer.valueOf(xxxxxxxx);
    -->
    <target name="-pre-compile">
        <apply-dirty-integer source="gen/tk/dweller/resourcehack/R.java"/>
    </target>
</project>