Source code for the 4th edition

Is there a source code for the projects in this book (4th edition)?

No, there is no source code available in that edition.

Probably you meant edition :slightly_smiling_face:

Yes, there is source code for the projects in the 4th edition book. Here is the download link:
https://www.bignerdranch.com/assets/solutions/AndroidProgramming4e.zip