1 找到工程项目的build.gradle
2 注释掉 jcenter() ，改用国内阿里云的maven库地址
这里注意，只需要分别修改 buildscript 和 allprojects 的 repositories 即可

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        maven{url 'http://maven.aliyun.com/nexus/content/groups/public/'}
        maven { url "https://jitpack.io" }
        google()
//        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.2'
    }
}

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

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

原文：https://www.jianshu.com/p/338860fc4921