如果用sdk manager下载sdk出现以下情况，主要是https需要设置ssl
Done loading packages.
Fetching https://dl-ssl.google.com/android/repository/addons_list-2.xml
Failed to fetch URL https://dl-ssl.google.com/android/repository/addons_list-2.xml, reason: Unknown Host dl-ssl.google.com
Fetched Add-ons List successfully
Fetching URL: https://dl-ssl.google.com/android/repository/repository-8.xml
Failed to fetch URL https://dl-ssl.google.com/android/repository/repository-8.xml, reason: IO Unknown Host dl-ssl.google.com
Fetching URL: https://dl-ssl.google.com/android/repository/addon.xml
Failed to fetch URL https://dl-ssl.google.com/android/repository/addon.xml, reason: IO Unknown Host dl-ssl.google.com
Fetching URL: https://dl-ssl.google.com/android/repository/extras/intel/addon.xml
Failed to fetch URL https://dl-ssl.google.com/android/repository/extras/intel/addon.xml, reason: IO Unknown Host dl-ssl.google.com
Fetching URL: https://dl-ssl.google.com/android/repository/sys-img.xml
Failed to fetch URL https://dl-ssl.google.com/android/repository/sys-img.xml, reason: IO Unknown Host dl-ssl.google.com
Fetching URL: https://dl-ssl.google.com/android/repository/sys-img/mips/sys-img.xml
Failed to fetch URL https://dl-ssl.google.com/android/repository/sys-img/mips/sys-img.xml, reason: IO Unknown Host dl-ssl.google.com
Fetching URL: https://dl-ssl.google.com/android/repository/sys-img/x86/sys-img.xml
Failed to fetch URL https://dl-ssl.google.com/android/repository/sys-img/x86/sys-img.xml, reason: IO Unknown Host dl-ssl.google.com
Done loading packages.
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解决办法：
第一招：设置本地hosts
windows里hosts位置在C:WindowsSystem32driversetc，找到hosts文件
直接在hosts文件加上红色部分：
#google_android更新
203.208.46.146 dl.google.com
203.208.46.146 dl-ssl.google.com127.0.0.1 servserv.generals.ea.com
74.125.237.1 dl-ssl.google.com
127.0.0.1 localhost
203.208.46.146 dl.google.com
74.125.237.1 dl-ssl.google.com
重新打开SDK Manager.exe就可以下载了
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第二招：打开SDK Manager.exe
点击Tools
出现以下界面：
HTTP Proxy Server：mirrors.neusoft.edu.cn
HTTP Proxy Port：80
如果遇到的问题是：Android SDK Manager的Download interrupted: URL not found问题
启动 Android SDK Manager ，打开主界面，依次选择Tools、Options...，弹出Android SDK Manager - Settings窗口。在 Android SDK Manager - Settings 窗口中，在 HTTP Proxy Server 和 HTTP Proxy Port 输入框内选择填入域名和端口号：
中国科学院开源协会镜像站地址：
IPV4/IPV6: http://mirrors.opencas.cn 端口：80
IPV4/IPV6: http://mirrors.opencas.org 端口：80
IPV4/IPV6: http://mirrors.opencas.ac.cn 端口：80
上海GDG镜像服务器地址：
http://sdk.gdgshanghai.com 端口：8000
北京化工大学镜像服务器地址：
IPv4: http://ubuntu.buct.edu.cn/ 端口：80
IPv4: http://ubuntu.buct.cn/ 端口：80
IPv6: http://ubuntu.buct6.edu.cn/ 端口：80
大连东软信息学院镜像服务器地址：
http://mirrors.neusoft.edu.cn 端口：80
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作者：HaleyLiu123
来源：CSDN
原文：https://blog.csdn.net/HaleyLiu123/article/details/78511652
版权声明：本文为博主原创文章，转载请附上博文链接！