解决Unknown host 'd29vzk4ow07wi7.cloudfront.net'. You may need to adjust the proxy settings in Gradle.

今天打开Android Studio鬼使神差去点了update到3.2.1，升级完后工程就报错了。。。

错误日志：Unknown host 'd29vzk4ow07wi7.cloudfront.net'. You may need to adjust the proxy settings in Gradle

尝试了各种方法，还是报错，比如（以下方法均在Project/build.gradle中修改）：

方法1：把两个 jcenter() 用 maven{ url ‘http://maven.aliyun.com/nexus/content/groups/public/’}替换  --->  报错

方法2：在jcenter()之前添加 maven{ url'http://maven.aliyun.com/nexus/content/groups/public/'}  --->  可以下载之前报错的库，但allProject还是编译出错

方法3：删掉maven{ url'http://maven.aliyun.com/nexus/content/groups/public/'}，google()放在jcenter()前 ---> 搞定

修改后的 build.gradle 如下：

buildscript {

    repositories {

        mavenCentral()

        google()

        jcenter()

    }

    dependencies {

        classpath'com.android.tools.build:gradle:3.0.1'

        classpath'org.greenrobot:greendao-gradle-plugin:3.2.1'

        // NOTE: Do not place your application dependencies here; they belong

        // in the individual module build.gradle files

        }

    }

allprojects {

    repositories {

        google()

        jcenter()

    }

}

task clean(type: Delete) {

    delete rootProject.buildDir

}

总结：google() 必须 在jcenter() 上，如果不行，就试试在 google() 下添加阿里云的镜像maven{url'http://maven.aliyun.com/nexus/content/groups/public/'}