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：
- 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在大陆被强了，伟大的天朝真是不让人活了，解决方法就是修改C:\Windows\System32\drivers\etc\hosts文件。添加一行：
- 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：
- # 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
# 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。
转载：http://blog.csdn.net/android_tutor/article/details/7425021