Android Studio 初始程序时sync出现connection reset的问题

重装android studio4.0 之后新建了一个工程，出现这种状况

解决方法：

1.在notepad下打开模块的build gradle修改下载源为阿里云：将原本的google(),jcenter()注释掉,关闭Android studio。

buildscript {
    repositories {
        //google()
        //jcenter()
        maven { url 'https://maven.aliyun.com/nexus/content/repositories/google' }
        maven{ url 'http://maven.aliyun.com/nexus/content/groups/public/' }
        maven{ url 'http://maven.aliyun.com/nexus/content/repositories/jcenter'}
    }
    dependencies {
        classpath "com.android.tools.build:gradle:4.0.0"

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

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

2.删掉C:\Users\用户名\.gradle文件夹。

3.在Android studio中重新打开项目，重新build project。