点击欢迎界面右下角的Configure –> settings –> Appearance & Behavior –> System Settings –> HTTP Proxy，

选中Auto-detect proxy settings，勾选下方Automatic proxy configuration URL，填入国内的某个镜像站。

如：输入 http://maven.aliyun.com/nexus/content/groups/public/

Android Studio设置国内镜像代理