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Using Dagger in your Android app

In this codelab you'll learn the importance of Dependency Injection (DI) to create a solid and extensible application that scales to large projects. We'll use Dagger as the DI tool to manage dependencies.

Dependency injection (DI) is a technique widely used in programming and well suited to Android development. By following the principles of DI, you lay the groundwork for a good app architecture.

Implementing dependency injection provides you with the following advantages:

  • Reusability of code.
  • Ease of refactoring.
  • Ease of testing.

You're now familiar with Dagger and you should be able to add it to your Android app. In this codelab you learned about:

  • How to create an Application graph using Dagger @Component annotation.
  • How to add information to the graph using @Inject, @Module, @Binds and @BindsInstance annotations.
  • How to create flow containers using @Subcomponent.
  • How to reuse instances of objects in different containers using Scopes.
  • Dagger Qualifiers and @Provides annotation.
  • How to test your application that uses Dagger with unit and instrumentation tests.