Android初心者を抜け出す高速道路 by @hotchemi
https://speakerdeck.com/hotchemi/androidchu-xin-zhe-woba-kechu-sugao-su-dao-lu
Android-Rate - Library to help you promote your app by prompting users to rate the app after using it for a few days.
https://github.com/hotchemi/Android-Rate
http://hotchemi.github.io/Android-Rate/