All over the Internet there are code snippets that show how to make a blur effect on Android. But if you want introduce blur as a part of your app design and use it an effect to hide content under dialogs, drawer etc. there is no ready solution. Thats why I wrote the Fogger library.
It does not require any complicated setup and has almost no effect on your app architecture. So it is simple to use even if your product already exist in the market