Android 替换Gradle源

谷歌镜像仓库地址

http://maven.aliyun.com/nexus/content/repositories/google

jentral镜像仓库地址

http://maven.aliyun.com/nexus/content/repositories/jcenter

MavenCentral镜像仓库地址

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