SDK 的安装出现问题了，Downloading Sources for Android SDK, API 15, revision 2
Download interrupted: Connection to https://dl-ssl.google.com refused

Skipping 'Android Wear ARM EABI v7a System Image, Android API 20, revision 1'; it depends on 'SDK Platform Android 4.4W, API 20, revision 1' which was not installed.
Skipping 'Android Wear Intel x86 Atom System Image, Android API 20, revision 1'; it depends on 'SDK Platform Android 4.4W, API 20, revision 1' which was not installed.
Skipping 'ARM EABI v7a System Image, Android API 19, revision 2'; it depends on 'SDK Platform Android 4.4.2, API 19, revision 4' which was not installed.
Skipping 'Intel x86 Atom System Image, Android API 19, revision 2'; it depends on 'SDK Platform Android 4.4.2, API 19, revision 4' which was not installed.

出现一些这样的，谁帮帮我