Reference:
http://blog.csdn.net/jiese1990/article/details/38373275
Http://jingyan.baidu.com/article/fd8044fa834e905031137ac6.html
Workaround One
HTTP Proxy Server:mirrors.neusoft.edu.cn
HTTP Proxy port:80
Solution Two
First you need to download a proxy server, open this software, see the generated proxy address in the content options, remember the IP address 127.0.0.1 and port number 8580
Then open the Android SDK Manager.exe open the options in Tools
In the popup dialog box, enter the IP address in the HTTP proxy server, enter the port into HTTP proxy port, select Force https://...
Close the dialog box
Re-opening the Android SDK Manager.exe will quickly appear in the list of updates, select the package that needs to be updated, click the install packages to update.
Update do not use Eclipse, otherwise eclipse will lock the Android-sdk-windows folder and should run directly after locating the directory where the Android SDK Manager.exe is located.
Android SDK Manager failed to update SDK