使用 Android Studio 开发时经常遇到编译卡住的问题，原因是 Gradle 下载依赖资源过慢。没办法，有长城在，还是得换镜像。

同样，这是个普遍存在的问题，我们希望可以对它进行全局配置。在 .gradle （路径参考 C:\Users\username\.gradle ）目录下新增 init.gradle 文件，内容如下：

allprojects{
  repositories {
    def ALIYUN_REPOSITORY_URL = 'http://maven.aliyun.com/nexus/content/groups/public'
    def ALIYUN_JCENTER_URL = 'http://maven.aliyun.com/nexus/content/repositories/jcenter'
    all { ArtifactRepository repo ->
      if(repo instanceof MavenArtifactRepository){
        def url = repo.url.toString()
        if (url.startsWith('https://repo1.maven.org/maven2') || url.startsWith('http://repo1.maven.org/maven2')) {
          project.logger.lifecycle "Repository ${repo.url} replaced by $ALIYUN_REPOSITORY_URL."
          remove repo
        }
        if (url.startsWith('https://jcenter.bintray.com/') || url.startsWith('http://jcenter.bintray.com/')) {
          project.logger.lifecycle "Repository ${repo.url} replaced by $ALIYUN_JCENTER_URL."
          remove repo
        }
      }
    }
    maven {
      url ALIYUN_REPOSITORY_URL
      url ALIYUN_JCENTER_URL
    }
  }


  buildscript{
    repositories {
      def ALIYUN_REPOSITORY_URL = 'http://maven.aliyun.com/nexus/content/groups/public'
      def ALIYUN_JCENTER_URL = 'http://maven.aliyun.com/nexus/content/repositories/jcenter'
      all { ArtifactRepository repo ->
        if(repo instanceof MavenArtifactRepository){
          def url = repo.url.toString()
          if (url.startsWith('https://repo1.maven.org/maven2') || url.startsWith('http://repo1.maven.org/maven2')) {
            project.logger.lifecycle "Repository ${repo.url} replaced by $ALIYUN_REPOSITORY_URL."
            remove repo
          }
          if (url.startsWith('https://jcenter.bintray.com/') || url.startsWith('http://jcenter.bintray.com/')) {
            project.logger.lifecycle "Repository ${repo.url} replaced by $ALIYUN_JCENTER_URL."
            remove repo
          }
        }
      }
      maven {
        url ALIYUN_REPOSITORY_URL
        url ALIYUN_JCENTER_URL
      }
    }
  }
}

如只需对单个项目进行配置，可以在项目根目录下的 build.gradle 文件中添加如下代码：

maven { url 'http://maven.aliyun.com/nexus/content/groups/public/' }
maven { url 'http://maven.aliyun.com/nexus/content/repositories/jcenter' }
maven { url 'http://maven.aliyun.com/nexus/content/repositories/google' }
maven { url 'http://maven.aliyun.com/nexus/content/repositories/gradle-plugin' }

搞定，下载速度飞起~