build.gradle

buildscript {
    ext {
        buildToolsVersion = "28.0.3"
        minSdkVersion = 19
        compileSdkVersion = 28
        targetSdkVersion = 28
        supportLibVersion = "28.0.0"
        googlePlayServicesVersion = "16.0.0"
        getVersionCode = { ->
                try {
                    def stdout = new ByteArrayOutputStream()
                    exec {
                    commandLine 'git', 'rev-list', '--count', 'master'
                        standardOutput = stdout
                    }
                    return Integer.parseInt(stdout.toString().trim())
                }
                catch (ignored) {
                    return -1;
                }
            }

    }