Android Studio中gradle版本升级报gradle的仓库地址不安全警告

1.Android Studio中gradle版本升级(阿里云仓库下载源)

classpath 'com.android.tools.build:gradle:3.6.3'
升级为
classpath 'com.android.tools.build:gradle:7.0.0'

distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.7-all.zip
升级为
distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-all.zip

2.Android Studio报gradle的仓库地址不安全警告的错误

使用"阿里云"仓库为下载源，如果直接升级gradle版本，可能会报错(gradle的仓库地址不安全警告的错误)，因为配置了除maven中央仓库之外的其他不安全的仓库(一些国内的镜像仓库，如"阿里云"镜像仓库也是不安全的)，如下所示:

A problem occurred configuring root project 'Packer'.
> Could not resolve all dependencies for configuration ':classpath'.
   > Using insecure protocols with repositories, without explicit opt-in, is unsupported. Switch Maven repository 'maven(http://maven.aliyun.com/nexus/content/groups/public/)' to redirect to a secure protocol (like HTTPS) or allow insecure protocols. See https://docs.gradle.org/7.0.2/dsl/org.gradle.api.artifacts.repositories.UrlArtifactRepository.html#org.gradle.api.artifacts.repositories.UrlArtifactRepository:allowInsecureProtocol for more details. 
* Try:
Run with --info or --debug option to get more log output. Run with --scan to get full insights.

3.使用allowInsecureProtocol属性解决gradle的仓库地址不安全警告的解决方法

gradle中有一个属性可以允许gradle使用"不安全"的仓库并且不报警告信息，该属性是allowInsecureProtocol，指定通过不安全的HTTP连接与仓库通信是否可接受，如果该属性的值设置为true，则表示接受"不安全"的仓库地址

只需要在C:\Users\LENOVO\.gradle\init.gradle文件中或者App项目工程的build.gradle中进行如下的配置即可解决

解决方法:
只需要在C:\Users\LENOVO\.gradle\init.gradle文件中或者App项目工程的build.gradle中，使用allowInsecureProtocol属性(允许gradle使用"不安全"的仓库并且不报警告信息)
allowInsecureProtocol = true

(1).C:\Users\LENOVO\.gradle\init.gradle

(2).App项目工程的build.gradle

buildscript {
    repositories {
        //ADD START
        maven {
            allowInsecureProtocol = true
            url 'http://maven.aliyun.com/nexus/content/groups/public/'
        }
        maven {
            allowInsecureProtocol = true
            url 'http://maven.aliyun.com/nexus/content/repositories/jcenter'
        }
        maven {
            allowInsecureProtocol = true
            url 'http://maven.aliyun.com/nexus/content/repositories/google'
        }
        maven {
            allowInsecureProtocol = true
            url 'http://maven.aliyun.com/nexus/content/repositories/gradle-plugin'
        }
        //ADD END
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:7.0.0'
    }
}

allprojects {
    repositories {
        //ADD START
        maven {
            allowInsecureProtocol = true
            url 'http://maven.aliyun.com/nexus/content/groups/public/'
        }
        maven {
            allowInsecureProtocol = true
            url 'http://maven.aliyun.com/nexus/content/repositories/jcenter'
        }
        maven {
            allowInsecureProtocol = true
            url 'http://maven.aliyun.com/nexus/content/repositories/google'
        }
        maven {
            allowInsecureProtocol = true
            url 'http://maven.aliyun.com/nexus/content/repositories/gradle-plugin'
        }
        //ADD END
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

4.Android Studio App项目工程同步成功、App项目编译成功

5.Android Studio中gradle的仓库地址不安全警告的通用解决方案(阿里云源)

gradle为了安全考虑，防止他人冒充目标服务器，并在资源中植入恶意代码...，所以默认禁用使用非官方的中央仓库（包括:阿里云），如果确认信任该仓库，需要显示声明信任它

第一种情况:with groovy

repositories {
    maven { 
        allowInsecureProtocol = true
        url "http://maven.aliyun.com/nexus/content/groups/public/" 
    }
    maven {
            allowInsecureProtocol = true
            url 'http://maven.aliyun.com/nexus/content/repositories/jcenter'
        }
        maven {
            allowInsecureProtocol = true
            url 'http://maven.aliyun.com/nexus/content/repositories/google'
        }
        maven {
            allowInsecureProtocol = true
            url 'http://maven.aliyun.com/nexus/content/repositories/gradle-plugin'
        }
}

第二种情况:with kotlin

repositories {
     maven { 
         isAllowInsecureProtocol = true
         setUrl("http://maven.aliyun.com/nexus/content/groups/public/") 
     }
     maven { 
         isAllowInsecureProtocol = true
         setUrl("http://maven.aliyun.com/nexus/content/repositories/jcenter") 
     }
     maven { 
         isAllowInsecureProtocol = true
         setUrl("http://maven.aliyun.com/nexus/content/repositories/google") 
     }
     maven { 
         isAllowInsecureProtocol = true
         setUrl("http://maven.aliyun.com/nexus/content/repositories/gradle-plugin") 
     }
}