Dependency Injection (DI) plays a key role in building scalable software projects. The Android community has spent the last decade experimenting and iterating on DI approaches primarily focused on the benefits of facilitating testing and building more modular apps. If you weren't in the industry during that experimentation and iteration it can be easy to miss how we got to where we are today.

In this talk, we're going back to basics! We're going to look at Dependency Injection, to help you understand the concepts behind the pattern, irrespective of which library, if any, you use to implement it. We'll look at the basic approaches to dependency substitution, see what problems DI can help solve, and learn how to make our own DI implementation.