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android.applicationVariants.all { variant ->
    // replace output apk name to <product>-<version>-<buildtype>-<githash>.apk
    def versionSuffix = variant.buildType.versionNameSuffix ? variant.buildType.versionNameSuffix : ""
    def versionName = variant.mergedFlavor.versionName + versionSuffix + "-${gitHash}";

    if (variant.zipAlign) {
        def apkFinal = variant.outputFile;
        variant.outputFile = new File(apkFinal.parentFile, apkFinal.name.replace(variant.buildType.name, versionName));
    }

    def apkProcess = variant.packageApplication.outputFile;
    variant.packageApplication.outputFile = 
        new File(apkProcess.parentFile, apkProcess.name.replace(variant.buildType.name, versionName));
}