解决JCenter下载慢

修改项目根目录下 build.gradle 中内容如下：

buildscript {

    repositories {

        google()

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

    }

}

allprojects {

    repositories {

        google()

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

    }

}