1.在Host文件加上
203.208.46.146 www.google.com
74.125.113.121 developer.android.com
203.208.46.146 dl.google.com
203.208.46.146 dl-ssl.google.com
74.125.31.190 dl-ssl.google.com
74.125.31.91 dl-ssl.google.com
74.125.31.93 dl-ssl.google.com
74.125.31.136 dl-ssl.google.com
2.打开android的SDK manager，点击Tool,选择“Option”,勾选上下面
Force Http://...sources to be fectched using http://..
信息来自：http://jingyan.baidu.com/article/b0b63dbfd0948c4a483070ea.html
情景：安卓错误Failed to fetch URL https://dl-ssl.google.com/android/repository/addons_list.xml:在设置里面去掉使用https的选项