Download interrupted: hostname in certificate didn‘t match: <dl-ssl.google.com> != <www.google.com>
Download interrupted: Connection to https://dl-ssl.google.com refused
Done. Nothing was installed.

解决办法是：将https://修改为http://
修改方法是：如下图，在Android SDK Manager->Tools-Options...选项界面，
将“Force https://… sources to be fetched using http://…”勾选！

Android SDK manager error