Android Gradle下载不动，修改为阿里镜像

修改build.gradle文件

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        google()
        //添加镜像
        maven{ url = "http://maven.aliyun.com/nexus/content/groups/public/" }
        jcenter()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:4.2.1"

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        //添加镜像
        maven{ url = "http://maven.aliyun.com/nexus/content/groups/public/" }
        jcenter() // Warning: this repository is going to shut down soon
    }
}

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