Android studio 下载资源太慢

解决办法，使用国内阿里镜像资源

位置：项目build.gradle

allprojects {
    repositories {
        maven { url "http://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" }
    }
}