国内由于众所周知的原因，sdk下载经常失败，提示如下：

Fetching https://dl-ssl.google.com/android/repository/addons_list-2.xmlFetched Add-ons List successfullyFetching URL: https://dl-ssl.google.com/android/repository/repository-8.xmlDone loading packages.Fetching https://dl-ssl.google.com/android/repository/addons_list-2.xmlFailed to fetch URL https://dl-ssl.google.com/android/repository/addons_list-2.xml, reason: Connection to https://dl-ssl.google.com refusedFetched Add-ons List successfullyFetching URL: https://dl-ssl.google.com/android/repository/repository-8.xmlFailed to fetch URL https://dl-ssl.google.com/android/repository/repository-8.xml, reason: HttpHostConnect Connection to https://dl-ssl.google.com refusedDone loading packages.

解决方法如下：

1.启动 Android SDK Manager ；

2.打开主界面，依次选择「Tools」、「Options...」，弹出『Android SDK Manager - Settings』窗口；

3.在『Android SDK Manager - Settings』窗口中，在「HTTP Proxy Server」和「HTTP Proxy Port」输入框内填入mirrors.neusoft.edu.cn和80，并且选中「Force https://... sources to be fetched using http://...」复选框；

4.设置完成后单击「Close」按钮关闭『Android SDK Manager - Settings』窗口返回到主界面；

5.依次选择「Packages」、「Reload」。

转载自：