Workaround:
Transfer from http://www.cnblogs.com/tc310/archive/2012/12/21/2828450.html
Http://jingyan.baidu.com/article/636f38bb267982d6b84610f0.html
First step: Modify the Hosts file
The contents of the modified Hosts file are:
127.0.0.1 Localhost#google Home 203.208.46.146 www.google.com# This line is for the convenience of opening the Android development website now it seems like no VPN can also open 74.125.113.121 developer.android.com# updated content is downloaded from the following address 203.208.46.146 dl.google.com203.208.46.146 dl-ssl.google.com****************** **********************
The second step, in the Android SDK Manager's tool->option option, is to force the HTTPS resource acquisition method into the way the HTTP protocol gets.
Android SDK Manager cannot download updates, or updates are slow, or the list of packages to be installed does not appear