使用阿里云仓库服务提升Gradle Sync速度

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在天朝使用jcenter、mavenCentral及google三个远程仓库，Gradle Sync会很慢，goole仓库甚至需要科学上网才能访问。为了加快Gradle Sync速度，一招教你优先用 阿里云仓库服务 的仓库作为下载源。

Maven仓库列表

仓库名	简介	实际地址	使用地址
jcenter	JFrog公司提供的仓库	http://jcenter.bintray.com	https://maven.aliyun.com/repository/jcenter
https://maven.aliyun.com/nexus/content/repositories/jcenter
mavenLocal	本台电脑上的仓库	{USER_HOME}/.m2/repository	C:/Users/liyujiang/.m2/repository (Windows)
/home/liyujiang/.m2/repository (Linux)
mavenCentral	Sonatype公司提供的中央库	http://central.maven.org/maven2	https://maven.aliyun.com/repository/central
https://maven.aliyun.com/nexus/content/repositories/central
google	Google公司提供的仓库	https://maven.google.com	https://maven.aliyun.com/repository/google

https://maven.aliyun.com/nexus/content/repositories/google
https://dl.google.com/dl/android/maven2 |
| jitpack | JitPack提供的仓库 | https://jitpack.io | https://jitpack.io |
| public | jcenter和mavenCentral的聚合仓库 | https://maven.aliyun.com/repository/public
https://maven.aliyun.com/nexus/content/groups/public |
| gradle-plugin | Gradle插件仓库 | https://plugins.gradle.org/m2 | https://maven.aliyun.com/repository/gradle-plugin
https://maven.aliyun.com/nexus/content/repositories/gradle-plugin |

阿里云代理仓库配置

在项目根目录下的build.gradle的buildscript.repositories及allprojects.repositories闭包内的最前面（Gradle是从上往下寻找的，故要放到jcenter()及google()的前面），添加阿里云仓库服务的代理仓库地址，示例如下：

buildscript {
    repositories {
        maven {
            url 'https://maven.aliyun.com/repository/jcenter'
        }
        maven {
            url 'https://maven.aliyun.com/repository/google'
        }
        jcenter()
        google()
    }
}

allprojects {
    repositories {
        maven {
            url 'https://maven.aliyun.com/repository/jcenter'
        }
        maven {
            url 'https://maven.aliyun.com/repository/central'
        }
        maven {
            url 'https://maven.aliyun.com/repository/google'
        }
        jcenter()
        mavenCentral()
        google()
    }
}