现象
编译工程时，编译log中报出因为SSL证书等原因无法下载下面仓库中的依赖：
1. https://jcenter.bintray.com
2. https://dl.google.com
3. https://dl.google.com/dl/android/maven2
导致编译失败。
常见的SSL异常有：
> Could not download xxxxxx.jar (xxx.xxx.xxx:xxx:x.x.x)
> Could not get resource 'https://jcenter.bintray.com/xxx.xxx/xxx/x.x.x/x.x.x-x.x.x.jar'.
> Could not GET 'https://jcenter.bintray.com/xxx.xxx/xxx/x.x.x/x.x.x-x.x.x.jar'.
> Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty
解决
- 找到工程的根build.gradle脚本
- 使用以下阿里云maven仓库代替
repositories节点中原有的maven()、jcenter()、google()：maven { url'[https://maven.aliyun.com/nexus/content/groups/public/](javascript:void(0);)'} maven { url'[https://maven.aliyun.com/repository/public/](javascript:void(0);)' } maven { url'[https://maven.aliyun.com/repository/google/](javascript:void(0);)' } maven { url'[https://maven.aliyun.com/repository/jcenter/](javascript:void(0);)' } maven { url'[https://maven.aliyun.com/repository/central/](javascript:void(0);)' } - 重新sync工程
