androidstudio 编译太慢

在工程build.gradle下添加阿里云
buildscript {
    repositories {
        jcenter()
        google()
        maven{ url 'http://maven.aliyun.com/nexus/content/groups/google'}
        maven{ url 'http://maven.aliyun.com/nexus/content/groups/jcenter'}
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.0'

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

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