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

修改项目下build.gradle文件

在jcenter()前添加mavenCentral()

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

buildscript {
    repositories {
        mavenCentral();
        jcenter()
    }
    dependencies {
//        classpath 'com.android.tools.build:gradle:2.0.0-alpha3'
        classpath 'com.android.tools.build:gradle:3.4.0'

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

allprojects {
    repositories {
        mavenCentral()
        jcenter()
    }
}

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