Connection to https://dl-ssl.google.com refused

Fetching https://dl-ssl.google.com/android/repository/addons_list-2.xml

Fetched Add-ons List successfully

Fetching URL: https://dl-ssl.google.com/android/repository/repository-8.xml

Done loading packages.

Fetching https://dl-ssl.google.com/android/repository/addons_list-2.xml

Failed to fetch URL https://dl-ssl.google.com/android/repository/addons_list-2.xml,
reason: Connection to https://dl-ssl.google.com refused

Fetched Add-ons List successfully

Fetching URL: https://dl-ssl.google.com/android/repository/repository-8.xml

Failed to fetch URL https://dl-ssl.google.com/android/repository/repository-8.xml,
reason: HttpHostConnect Connection to https://dl-ssl.google.com refused

Done loading packages.

解决方案：

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

依次选择「Packages」、「Reload」。