android studio 中由于网络问题，编译错误

由于网络原因，需要连外网实现下载相关依赖包，导致编译失败

在 build.gradle文件中

将原来是jcenter()的地址改成

 maven{ url 'http://maven.aliyun.com/nexus/content/groups/public/'}
然后重新编译
maven是阿里云搭建的国内的镜像，可以加快下载依赖包。

buildscript {

    repositories {
        google()
        maven{ url 'http://maven.aliyun.com/nexus/content/groups/public/'}
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.0'

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

allprojects {
    repositories {
        google()
        maven{ url 'http://maven.aliyun.com/nexus/content/groups/public/'}
    }
}

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