修改根目录下的settings.gradle，增加以下代码

gradle.beforeProject {
    //定义变量
    def pattern
    def matcher
    def result

    //获取Config.java中的变量值
    //从public static final String ServAddr = "https://10.0.0.111:9093";中抽取111
    def cfgFile = file("app/src/main/java/com/jeff/demo/config/Config.java")
    pattern = Pattern.compile("(?:^|\\n)[^/].*?.(\\d+):")
    matcher = pattern.matcher(cfgFile.getText())
    matcher.find()
    def flag = matcher.group(1)

    //修改build.gradle中的short_ip值
    def buildFile = file("app/build.gradle")
    result = buildFile.getText()

    pattern = Pattern.compile("short_ip\\s.*'(\\d*)'")
    matcher = pattern.matcher(result)
    matcher.find()
    result = matcher.replaceAll("short_ip = \'" + flag + "\'")

    //修改版本号
    pattern = Pattern.compile("versionCode\\s+(\\d+)")
    matcher = pattern.matcher(result)
    matcher.find()
    def versionCode = Integer.parseInt(matcher.group(1))
    result = matcher.replaceAll("versionCode " + ++versionCode)

    //修改版本名
    pattern = Pattern.compile("versionName\\s+\"(.+)\"")
    matcher = pattern.matcher(result)
    matcher.find()
    int no = 0
    int decade = 0
    int hundred = 0
    int thousand = 0
    int remain = versionCode
    int base = 10
    int operand = base**3
    if (versionCode >= operand) {
        thousand = remain / operand
        remain = remain % operand
    }
    operand = base**2
    if (remain >= operand) {
        hundred = remain / operand
        remain = remain % operand
    }
    operand = base**1
    if (remain >= operand) {
        decade = remain / operand
        remain = remain % operand
    }
    if (remain > 0) {
        no = remain % operand
    }

    def versionName = "\"" + thousand + "." + hundred + "." + decade + "." + no + "\""
    result = matcher.replaceAll("versionName " + versionName)

    //重写文件
    buildFile.write(result)
}