如果用sdk manager下載sdk出現以下情況，主要是https需要設置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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解決辦法：

第一招：設置本地hosts

windows里hosts位置在C:\Windows\System32\drivers\etc，找到hosts文件

直接在hosts文件加上紅色部分：

#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

重新打開SDK Manager.exe就可以下載了

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第二招：打開SDK Manager.exe

點擊Tools

出現以下界面：

HTTP Proxy Server：mirrors.neusoft.edu.cn

HTTP Proxy Port：80

如果遇到的問題是：Android SDK Manager的Download interrupted: URL not found問題

啟動?Android?SDK?Manager?，打開主界面，依次選擇Tools、Options...，彈出Android?SDK?Manager?-?Settings窗口。在?Android?SDK?Manager?-?Settings?窗口中，在?HTTP?Proxy?Server?和?HTTP?Proxy?Port?輸入框內選擇填入域名和端口號：

中國科學院開源協會鏡像站地址： 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鏡像服務器地址： http://sdk.gdgshanghai.com 端口：8000 北京化工大學鏡像服務器地址： 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 大連東軟信息學院鏡像服務器地址： http://mirrors.neusoft.edu.cn 端口：80

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