android studio引用远程仓库无法下载问题（jcenter）

问题： 同步项目，遇到Jcenter 仓库无法下载，报错如下

Could not GET 'https://jcenter.bintray.com/xerces/xercesImpl/2.9.1/xercesImpl-2.9.1.jar'.

1. 添加 jcenter

• 修改项目根目录的 build.gradle 文件

buildscript {
.....
    repositories {
        google()
        jcenter {
            url "http://jcenter.bintray.com"
        }
    }
......
}
......

allprojects {
    repositories {
        mavenCentral()
        google()
        jcenter {
            url "http://jcenter.bintray.com"
        }
    }
}

2. 使用阿里镜像(下载快，推荐)

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

    }
......
}
......

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