问题：windows下运行sdkManager.exe总是提示：
Fetching https://dl-ssl.google.com/android/repository/addons_list-1.xml Failed to fetch URL https://dl-ssl.google.com/android/repository/addons_list-1.xml, reason: Connection to https://dl-ssl.google.com refused Fetched Add-ons List successfully Refresh Sources Fetching URL: https://dl-ssl.google.com/android/repository/repository-6.xml Failed to fetch URL https://dl-ssl.google.com/android/repository/repository-6.xml, reason: Connection to https://dl-ssl.google.com refuse
解决方案：
在C:\Windows\System32\drivers\etc\下找到hosts 修改如下：
# copyright (c) 1993-1999 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 host127.0.0.1 localhost
74.125.237.1 dl-ssl.google.com