gradle_string_parser.txt

//build.gradle
task parseString {
    ext.srcFile = file('app/src/main/res/values/strings.xml')

    def strings = new XmlSlurper().parse(srcFile)
    def file1 = new File('stringValues.txt')
    def file2 = new File('stringNames.txt')

    strings.string.each{
        file1 << it.text() << "\n"  // or /* file2 << it[0] << "\n"*/
        file2 << it.@'name' << "\n"
    }
}