最近刚换了电脑，开始搭建Android开发环境的时候，下载SDK总是会出现如下错误：
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Failed to fetch URL http://dl-ssl.google.com/android/repository/addons_list-1.xml.
据说dl-ssl.google.com在大陆被强了，伟大的天朝真是不让人活了，解决方法就是修改C:WindowsSystem32driversetchosts文件。添加一行：
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74.125.237.1 dl-ssl.google.com
这里需要注意的是hosts文件是只读的，我们没有权限修改，需要我们将hosts文件复制到桌面或者其他地方，然后修改，代码如下：
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Copyright (c) 1993-2009 Microsoft Corp.
This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
This file contains the mappings of IP addresses to host names. Each
entry should be kept on an individual line. The IP address should
be placed in the first column followed by the corresponding host name.
The IP address and the host name should be separated by at least one
space.
Additionally, comments (such as these) may be inserted on individual
lines or following the machine name denoted by a '#' symbol.
For example:
102.54.94.97 rhino.acme.com # source server
38.25.63.10 x.acme.com # x client host
localhost name resolution is handled within DNS itself.
127.0.0.1 localhost
::1 localhost
//亲，就是增加这一句哦
74.125.237.1 dl-ssl.google.com
然后保存，复制修改后的hosts文件到C:WindowsSystem32driversetc 目录，替换文件就好！！！我们再次下载SDK的时候就会成功啦，如下图：
嘿嘿，大功告成啦！！！
PS：补充下，在mac或Linux中，hosts文件所在位置为/etc/hosts，可以使用sudo vim /etc/hosts来编辑。
文章来源：http://blog.csdn.net/android_tutor/article/details/7425021