Android dependency injection with dagger 2 udemy download

MVP with Dagger 2. Skip to content. Star List of resources to learn about Dependency Injection and Dagger 2 stars 54 forks. Branches Tags. Could not load branches. Could not load tags. Transmit network data using Volley.

Perform network operations using Cronet. Transferring data without draining the battery. Reduce network battery drain. Transfer data using Sync Adapters. Bluetooth Low Energy. Wi-Fi infrastructure. Discover and connect. Runtime API reference. Web-based content. Android App Bundles. Google Play. Play Asset Delivery. Play Feature Delivery. In-app reviews. In-app updates. Google Play Instant. Get started with instant apps.

Get started with instant games. Integrate with Firebase. Play Install Referrer. Play Install Referrer Library. Application Licensing. Android GPU Inspector. System profiling. Analyze a system profile. GPU performance counters. Frame profiling. Analyze a frame profile. Frame Profiler UI.

Customize or port game engines. Process input events. Support game controllers. Achieve proper frame pacing. Frame pacing in Vulkan. Integrate Android Performance Tuner. Output audio. Manage memory.

Use prebuilt or turnkey game engines. Develop with Defold. Develop with Godot. Develop with Unity. Use Android Performance Tuner.

Game best practices. Maximize device availability. Art assets. OpenGL and Vulkan. Game Mode. Best practices. Building effective unit tests. Automating UI tests. Testing app component integrations. Android Vitals. Optimizing for Battery Life. System tracing. Build and test apps for accessibility. Advanced topics. Protecting against security threats with SafetyNet. Build for Billions. Build for Enterprise. App feedback. Device management.

Dedicated devices. Android versions. Android Developers. Adding dependencies First, add the hilt-android-gradle-plugin plugin to your project's root build. Inject AnalyticsServiceImpl Kotlin Qualifier Retention AnnotationRetention. Module InstallIn ActivityComponent. Module InstallIn SingletonComponent.

Figure 1. Hierarchy of the components that Hilt generates. View annotated with WithFragmentBindings. You are getting the AppComponent from WikiApplication and asking it to inject all known dependencies into HomepageActivity. Since you annotated presenter with Inject , Dagger will inject a concrete HomepagePresenter object into HomepageActivity. Dagger knows that you defined provideHomepagePresenter in the PresenterModule class, and uses it to create the injected HomepagePresenter object.

Build and run your app now. There is a general pattern that emerges based on the previous code changes. Think about the steps just taken to use Dagger dependency injection with HomepageActivity :. If you consider HomepageActivity as the target class, and HomepagePresenter as the source interface to be injected, then the above steps can be generalized as follows for any target class requiring source interfaces to be injected:. As a challenge, see if you can perform an injection of the EntryPresenter detail screen into SearchActivity.

This will include removing the following line of code:. The steps are just the same as above for HomepageActivity. Use the pattern, and if you get stuck, check out the final project code at the end of this tutorial. In the app as written currently, both the list screen and detail screen presenters create their own network dependencies. In a typical app that uses Dagger 2 and OkHttp 3 together, OkHttp will be provided by dependency injection. Here you will see some of the many advantages of using dependency injection and Dagger 2, including:.

Start by creating a new file in the dagger package, this time named NetworkModule , which starts off as follows:. This same technique can be used for your own types if you need multiple variations injected. Next, create a new file in the dagger package called WikiModule , and add provide methods for the API:.

Builder object, and a WikiApi object. This allows Dagger to construct a dependency graph, so that, for example, when an object asks for a Wiki object to be injected, Dagger will first provide a WikiApi and then OkHttpClient and HttpUrl. Builder objects starting from provideWiki api: WikiApi. By using the Singleton annotations, only one instance of the WikiApi and OkHttpClient objects will be created and shared between both activities in the app.

Next, update the PresenterModule provide methods so that the Context is passed as a constructor argument:. At this point you can remove the initialization:. As a last step, the WikiApi class needs a constructor with an injected parameter, so you must update it:. Now everything should be ready to go. Build and run the app, and bask in the glory of decoupled, injected code!

You can download the final project here. Especially since everything was already working before implementing dependency injection. The utility of dependency injection and a framework like Dagger 2 become most evident in real-world production apps, where the dependency graph can get very complex.

Dagger 2 and dependency injection become especially useful when implementing proper testing into your app, allowing mock implementations of back-end APIs and data repositories to be used in testing. There are many great resources out there on the interwebs to dive into these topics and one I must suggest is a talk by Jake Wharton at DevOxx , where you can get some more information about the history of DI on Android, some theory and some nice examples.

As you do, happy injecting! The raywenderlich. Get a weekly digest of our tutorials and courses, and receive a free in-depth email course as a bonus! Introducing unlimited access to all video courses, all books, and our new monthly live professional development series!

Android kotlin developer in a complicate hate and love relationship with the green robot. I need to automate nearly Gson; import com. GsonBuilder; import javax. Provides; import okhttp3. Cache; import okhttp3.

OkHttpClient; import retrofit2. Retrofit; import retrofit2. Builder ; client. We also define all the modules using the Component annotation as we can see in the code. Bundle; import android. ArrayAdapter; import android. ListView; import android. Toast; import androidx. AppCompatActivity; import java.

List; import javax. Inject; import retrofit2. Call; import retrofit2. Callback; import retrofit2.