0.离线下载
    /home/user用户名/.gradle/wrapper/dists
    然后直接进入【gradle-4.4-all】》【9br9xq1tocpiv8o6njlyu5op1】文件夹
    刚才复制的压缩包复制到当前文件夹下，然后解压出来。
    grade
    1.C:\Users\用户.gradle下init.gradle（沒有此文件就新建一個）文件下增加如下代码内容

    1. allprojects{
    2.     repositories {
    3.         def ALIYUN_REPOSITORY_URL = 'http://maven.aliyun.com/nexus/content/groups/public'
    4.         def ALIYUN_JCENTER_URL = 'http://maven.aliyun.com/nexus/content/repositories/jcenter'
    5.         all { ArtifactRepository repo ->
    6.             if(repo instanceof MavenArtifactRepository){
    7.                 def url = repo.url.toString()
    8.                 if (url.startsWith('https://repo1.maven.org/maven2')) {
    9.                     project.logger.lifecycle "Repository ${repo.url} replaced by $ALIYUN_REPOSITORY_URL."
    10.                     remove repo
    11.                 }
    12.                 if (url.startsWith('https://jcenter.bintray.com/')) {
    13.                     project.logger.lifecycle "Repository ${repo.url} replaced by $ALIYUN_JCENTER_URL."
    14.                     remove repo
    15.                 }
    16.             }
    17.         }
    18.         maven {
    19.             url ALIYUN_REPOSITORY_URL
    20.             url ALIYUN_JCENTER_URL
    21.         }
    22.     }
    23. }

    2.android 工程根目录下的的build.gradle文件中配置国内阿里镜像库
    阿里云镜像元

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