Small overview of dependency injection

1. Dependency injection
What? Where? Why? when?

2. WHAT IS DEPENDENCY?

3. INJECTION
Push dependency from outside into the class.
• Fetch dependency
• Receive dependency

4. DI
Ask third party to create object, instead of create dependencies yourself.

5. WHY NEED DI
Decouple classes construction from construction of your dependency.

6. DEPENDENCY INVERSION PRINCIPLE
Class Dependency
Interface
Implementation
Dependency

7. DI CONTAINER
Create and map dependency

8. DI LIBRARIES FOR ANDROID
• ButterKnife
• Dagger 2