gradle升级到7.0.0，结果发现报错：
Android studio build
Using insecure protocols with repositories, without explicit opt-in, has been deprecated. This is scheduled to be removed in Gradle 7.0. Switch Maven repository 'm
aven(http://maven.aliyun.com/nexus/content/groups/public/)' to a secure protocol (like HTTPS) or allow insecure protocols. See https://docs.gradle.org/6.8.3/dsl/or
g.gradle.api.artifacts.repositories.UrlArtifactRepository.html#org.gradle.api.artifacts.repositories.UrlArtifactRepository:allowInsecureProtocol for more details.
Configuration on demand is an incubating feature.
看官方描述:UrlArtifactRepository
Specifies whether it is acceptable to communicate with a repository over an insecure HTTP connection.
For security purposes this intentionally requires a user to opt-in to using insecure protocols on case by case basis.
Gradle intentionally does not offer a global system/gradle property that allows a universal disable of this check.
*Allowing communication over insecure protocols allows for a man-in-the-middle to impersonate the intended server, and gives an attacker the ability to [serve malicious executable code onto the system.](https://max.computer/blog/how-to-take-over-the-computer-of-any-java-or-clojure-or-scala-developer/)*
解决方法：
在maven中加入allowInsecureProtocol=true
