Android SDK下载和更新失败的解决方法

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：

[java] view plaincopyprint?

1. Failed to fetch URL http://dl-ssl.google.com/android/repository/addons_list-1.xml. 

Failed to fetch URL http://dl-ssl.google.com/android/repository/addons_list-1.xml.

据说dl-ssl.google.com在大陆无法访问，解决方法就是修改C:\Windows\System32\drivers\etc\hosts文件。添加一行：

[java] view plaincopyprint?

1. 74.125.237.1       dl-ssl.google.com 

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：

[java] view plaincopyprint?

1. # Copyright (c) 1993-2009 Microsoft Corp. 
2. # 
3. # This is a sample HOSTS file used by Microsoft TCP/IP for Windows. 
4. # 
5. # This file contains the mappings of IP addresses to host names. Each 
6. # entry should be kept on an individual line. The IP address should 
7. # be placed in the first column followed by the corresponding host name. 
8. # The IP address and the host name should be separated by at least one 
9. # space. 
10. # 
11. # Additionally, comments (such as these) may be inserted on individual 
12. # lines or following the machine name denoted by a '#' symbol. 
13. # 
14. # For example: 
15. # 
16. #      102.54.94.97     rhino.acme.com          # source server 
17. #       38.25.63.10     x.acme.com              # x client host 
18.  
19. # localhost name resolution is handled within DNS itself. 
20. #   127.0.0.1       localhost 
21. #   ::1             localhost 
22. //亲，就是增加这一句哦 
23. 74.125.237.1       dl-ssl.google.com 

# 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:\Windows\System32\drivers\etc 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。