ext {
    build = [
            minSdkVersion    : 16,
            targetSdkVersion : 29,
            compileSdkVersion: 29,
            versionCode      : 51,
            versionName      : "1.0.1",
            dbVersion        : 2
    ]
    sign = [
            keyAlias     : "签名别名",
            keyPassword  : "签名密码",
            storeFile    : "签名文件路径",
            storePassword: "签名文件密码",
    ]
}