安装Android Studio后第一次启动遇到这个问题："Unable to access Android SDK add-on list"

原因好像是防火墙的设置问题。网上解决办法有两种：

1. 修改防火墙设置：http://stackoverflow.com/questions/29878370/first-run-of-android-studio-unable-to-access-android-sdk-add-on-list

1.Clear any DNS settings that might be present in your network adapter or router.

2.Either turn off the firewall (windows or antivirus's) completely or add an exception.

3.Stop any other application that might be using internet hence slowing it down.

4.Close android studio completely and run SDK Manager to update all the components that are awaiting an update, especially addons.

2. disable first run的功能：http://jingyan.baidu.com/article/6181c3e085ce7c152ef153b2.html

这种方式只要到 安装路径android\Android Studio\bin\idea.properties中添加disable.android.first.run=true重新启动应用程序即可。