[移动开发]flutter项目app上架Google Play 审核问题: HostnameVerifier

关于flutter项目app上架Google Play 审核问题：

Your app(s) are using an unsafe implementation of the HostnameVerifier
interface. You can find more information about how resolve the issue
in this Google Help Center article.
即：
您的应用正在使用 HostnameVerifier 接口的不安全实现。您可以在这篇 Google 帮助中心文章中找到有关如何解决问题的更多信息。

首先是要定位到问题所在，到底哪里实现了不安全接口。起初毫无头绪，所以在项目中使用关键词 HostnameVerifier 进行搜索。发现了这个开关，默认是开启ON。尝试性关闭进行了打包重新上架，结果成功上架。
但是 这个 Insecure HostnameVerifier（不安全主机名验证程序）并不清楚是什么，官方中也未暂无查到用途作用，但直觉认为不能就这样关闭。

所以再次重新检查第三方插件中什么业务用到相关内容。后来在插件flutter_braintree中的braintree官网中发现有相关 HostnameVerifier 内容，并在https://stackoverflow.com上了解到大致是braintree sdk引起的插件漏洞问题。

我的项目开发中引用依赖版本为： flutter_braintree: ^1.0.3

查看flutter_braintree官网的changelog时发现：

1.1.0+1 # 修复 Braintree 插件中的漏洞（Play Store 问题）

虽然没具体解释，但决定升级到该版本 flutter_braintree: ^1.1.0+1。
进行Put get 过程中：

https://cardinalcommerce.bintray.com/android/org/jfrog/cardinalcommerce/gradle/cardinalmobilesdk/2.2.4-1/cardinalmobilesdk-2.2.4-1.pom ”。无法获取从服务器收到状态代码 403

Could not resolve all task dependencies for configuration ‘:app:releaseRuntimeClasspath’.
Could not resolve org.jfrog.cardinalcommerce.gradle:cardinalmobilesdk:2.2.3-2.
Required by:
project :app > project :react-native-braintree-dropin-ui > com.braintreepayments.api:drop-in:4.6.0 > com.braintreepayments.api:three-d-secure:3.11.1
Could not resolve org.jfrog.cardinalcommerce.gradle:cardinalmobilesdk:2.2.3-2.
Could not get resource ‘https://cardinalcommerce.bintray.com/android/org/jfrog/cardinalcommerce/gradle/cardinalmobilesdk/2.2.3-2/cardinalmobilesdk-2.2.3-2.pom’.
Could not GET ‘https://cardinalcommerce.bintray.com/android/org/jfrog/cardinalcommerce/gradle/cardinalmobilesdk/2.2.3-2/cardinalmobilesdk-2.2.3-2.pom’. Received status code 403 from server: Forbidden
Could not resolve org.jfrog.cardinalcommerce.gradle:cardinalmobilesdk:2.2.3-2.
Could not get resource ‘https://cardinalcommerce.bintray.com/android/org/jfrog/cardinalcommerce/gradle/cardinalmobilesdk/2.2.3-2/cardinalmobilesdk-2.2.3-2.pom’.
Could not GET ‘https://cardinalcommerce.bintray.com/android/org/jfrog/cardinalcommerce/gradle/cardinalmobilesdk/2.2.3-2/cardinalmobilesdk-2.2.3-2.pom’. Received status code 403 from server: Forbidden
Could not resolve org.jfrog.cardinalcommerce.gradle:cardinalmobilesdk:2.2.3-2.
Could not get resource ‘https://cardinalcommerce.bintray.com/android/org/jfrog/cardinalcommerce/gradle/cardinalmobilesdk/2.2.3-2/cardinalmobilesdk-2.2.3-2.pom’.
Could not GET ‘https://cardinalcommerce.bintray.com/android/org/jfrog/cardinalcommerce/gradle/cardinalmobilesdk/2.2.3-2/cardinalmobilesdk-2.2.3-2.pom’. Received status code 403 from server: Forbidden```

解决办法：再集成过程中 可参考
Could not resolve cardinalmobilesdk Required by: braintreepayments:5.2.1( In provided Demo Project as well) #246

在Android主 build.gradle 中添加如下代码

repositories {
    maven {
        url "https://cardinalcommerceprod.jfrog.io/artifactory/android"
        credentials {
            username 'braintree_team_sdk'
            password 'AKCp8jQcoDy2hxSWhDAUQKXLDPDx6NYRkqrgFLRc3qDrayg6rrCbJpsKKyMwaykVL8FWusJpp'
        }
    }
}