Android Dependency Injection with Dagger 2 and Kotlin

Learn how to use Dagger, the dependency injection framework, and Kotlin, the Android-specific programming language, to create cleaner code that requires less debugging.

Introduction

• Improve dependency injection with Dagger
• What you should know
• Using the exercise files

1. Basics

• What is Dagger?
• Why use Dagger?
• Setting up a Dagger project

2. Essential Dagger

• Building the graph with @Inject and @Component
• Introducing Dagger
• Method and field injection
• Lazy and provider injection

3. Modules

• When Dagger can't figure it out: @Modules and @Binds
• When it's complicated: @Provides
• When types are not enough: @Named
• Multibinding: Sets
• Multibinding: Maps with simple keys
• Real-world example: Architecture components #1
• Real-world example: Architecture components #2
• Real-world example: Architecture components #3
• Multibinding: Maps with complex keys
• Real-world example: Architecture components solved

4. Components

• @Components review
• Extending the builder with @Component.Builder and @BindsInstance
• @Component dependencies
• Introducing @Subcomponents
• @Subcomponents review
• Extending the subcomponent builder

5. Scope

• Rethinking the graph
• @Singletons and @Reuseable
• Custom @Scope

Conclusion

• Next steps