解决办法是：将https://修改为http://
修改方法是：在Android SDK Manager->Tools-Options...选项界面，选择将https://修改为http://
然后
更新host 文件，在文件（C:\Windows\System32\drivers\etc\hosts）中，添加如下几行：
linux host 文件位置：/etc/hosts
74.125.237.1 dl-ssl.google.com #光更新这一个是不行的。
203.208.46.146 www.google.com
203.208.46.146 dl.google.com
203.208.46.146 dl-ssl.google.com
74.125.71.82 www.googlesource.com
74.125.31.82 android.googlesource.com
203.208.46.172 cache.pack.google.com
59.24.3.173 cache.pack.google.com
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