新建文件:init.gradle

Gradle修改成国内镜像_maven

文件内容:

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