link to all book source code?
@wozaderapps You can download the source code for the book over here:
https://store.raywenderlich.com/products/advanced-android-app-architecture-source-code
I hope it helps! :]
@shogunkaramazov Thank You!!
@shogunkaramazov The link opens a blank page with a photo for the book cover and there is no download option
Hi @noureldeen-abouelkas , welcome to the community. 
If you would like to download the code, it’s available from a GitHub repo:
The raywenderlich website has a new design. The store page for the Advanced Android App Architecture book is now https://www.raywenderlich.com/books/advanced-android-app-architecture