The course is ridiculously bad and mostly serves as a reference to OOP patterns from GoF. It is very abstract, the examples of using the patterns are insufficient. Moreover, assignments for using patterns are horrible and really harmful: they force you to apply some of GoF patterns without real necessity. This just adds additional layers of abstraction to your code (thus, making it more complicated) without any benefits. Also, there are no control of your knowledge or understanding. Instead of some objective control, the assignments are reviewed by different learners, and you do not know: either your assignment is correct or a reviewer does not understand the material in the same way as you or the reviewer just marked your assignment as correct without reviewing. The suggestion: do not buy the course and just read "Design Patterns: Elements of Reusable Object-Oriented Software". It is much more useful.

The contents are ok, but making the implementation depend in an environment as complex as Android makes that most of the effort is on making Android Studio behave, not on thinking about the design. Avoid if you are not familiar with or interested in Android development.

Appears to be written by someone hired as a java expert who is not a java expert

j