Heavy Metal

9

To The Hilt

29.01.2022

There are multiple reasons why we should create a new module:. Create a new file called NavigationModule. There, let's create a new abstract class called NavigationModule annotated with Module and InstallIn ActivityComponent::class as explained above:. Inside the new module, we can add the binding for AppNavigator. It's an abstract function that returns the interface we're informing Hilt about i. AppNavigator and the parameter is the implementation of that interface i.

Now we have to tell Hilt how to provide instances To The Hilt AppNavigatorImpl. Since this class can be constructor injected, we can just annotate its constructor with Inject. AppNavigatorImpl depends on a FragmentActivity. Because an AppNavigator instance is provided in the Activity containerFragmentActivity is already available as a predefined binding.

Now, Hilt has all the information to be able to inject an AppNavigator instance. Open the MainActivity. The only class that is still using the ServiceLocator to grab dependencies is ButtonsFragment. Since Hilt already knows how to provide all the types that ButtonsFragment needs, we can just perform field injection in the class. Notice that the instance of LoggerLocalDataSource will be the same as the one we used in LogsFragment since the type is scoped to the application container.

However, the instance of AppNavigator will be different from the instance in MainActivity as we haven't scoped it to its respective Activity container. At this point, the ServiceLocator class no longer provides dependencies so we can remove it completely from the project. The only usage remains in the LogApplication class where we kept an instance of it. Let's clean that class as we don't need it anymore. Open the LogApplication class and remove the ServiceLocator usage.

The new code for the Application class is:. Now, feel free to remove the ServiceLocator class from the project altogether. As ServiceLocator is still used in tests, remove its usages from the AppTest class as well. What you just learnt should be enough to use Hilt as the Dependency Injection tool in your Android application. From now on, we'll add new functionality to our app to learn how to use more advanced Hilt features in different situations. Now that we've removed the ServiceLocator class from our project and you learned the basics of Hilt, let's add new functionality to the app to explore other To The Hilt features.

To show this, we need a different behavior in our app. We'll swap the log storage from a database to an in-memory list with the intention of To The Hilt recording the logs during an app session. Let's start abstracting the data source into an interface. Create a new file called LoggerDataSource. We need to refactor them to use an instance of LoggerDataSource instead. Next, let's make the LoggerLocalDataSource implement this interface. To be able to use LoggerInMemoryDataSource as an implementation detail, we need to tell Hilt how to provide instances of this type.

As before, we annotate the class constructor with Inject :. Since our application consists of only one Activity also called a single-Activity applicationwe should have an instance of the LoggerInMemoryDataSource in the Activity container and reuse that instance across Fragment s.

We can achieve the in-memory logging behavior by scoping LoggerInMemoryDataSource to the Activity container: every Activity created will have its own container, a different instance. On each container, the same instance of LoggerInMemoryDataSource will be provided when the logger is needed as a dependency or for field injection. Also, the same To The Hilt will be provided in containers below the Components hierarchy.

Following the scoping to Components documentationto scope a type to the Activity container, we need to annotate the type with ActivityScoped :. Hilt doesn't know which implementation to use when LoggerDataSource is requested. As we know from previous sections, we can use the Binds annotation in a module to tell Hilt which implementation to use.

However, what To The Hilt we need to provide both implementations in the same project? Let's create a new file in the di folder called LoggingModule. Binds methods must have the scoping annotations if the type is scoped, so that's why the functions above are annotated with Singleton and ActivityScoped. If Binds or Provides are used as a binding for a type, the scoping annotations in the type are not used anymore, so you can go ahead and remove them from the different implementation classes.

If you try to build the project now, you'll see a DuplicateBindings error! This is because the LoggerDataSource type is being injected in our Fragment s but Hilt doesn't know which implementation to use because there are two bindings of the same type! How can Hilt know which one to use? To tell Hilt how to provide different implementations multiple bindings of the same type, you can use qualifiers. We need to define a qualifier per implementation since each qualifier will be used to identify a binding.

When injecting the type in an Android class or having that type as a dependency of other classes, the qualifier annotation needs to be used to avoid ambiguity. As a qualifier is just an annotation, we can define them in the LoggingModule. Now, these qualifiers must annotate the Binds or Provides in case we need it functions that provide each implementation.

See the full code and notice the qualifiers usage in the Binds methods:. Also, these qualifiers must be used at the injection point with the implementation we want to be injected. If you want to change the database implementation you want to use, you just need to annotate the injected fields with DatabaseLogger instead of InMemoryLogger. We can run the app and confirm what we've done by interacting with the buttons and observing the appropriate logs appear on the "See all logs" screen.

Note that the logs are not saved to the database anymore. They don't persist between sessions, whenever you close and open the app again, the log screen is empty. Now that the app is fully migrated to Hilt, we can also migrate the instrumentation test that we have in the project. The test that checks the functionality of the app is in the AppTest. License article. Follow the topics, people and companies that matter to you.

Find out more. Property market. Homeloans Limited. Property prices. Property investment. Adding the repository in Gradle In your build. This was an internal-only artifact, so its removal should not affect users.

Bug Fixes Fix : Fixes an issue in Hilt's bytecode transform that would cause classes to fail validation if they contained an instantiation of an object whose type is the same as the superclass of the androidentrypoint annotated class.

This is in preparation for eventually unnesting these classes from within their parent component to avoid issues that arise from deeply nested class names being too long.

Hilt bug fixes Fix : Adds a flag to disable the cross-compilation root validation that was enabled by default as of version 2. New breaking changes In the rare case that an app is relying on an EarlyEntryPoint usage in a library that is built using an older version of Hilt, the EarlyEntryPoint will no longer be picked up, resulting in a runtime error in tests production code will be unaffected.

To fix, all upstream usages of EarlyEntryPoint must be built using this version of Hilt or later. Hilt version 2. Bug fixes Fix an issue where internal Kotlin object modules were incorrectly depended To The Hilt directly by the component, which could result in a build failure if the component did not have visibility to the module.

For more information on how to enable this flag as well as some caveats, see the docs New breaking changes The alpha androidx extension ViewModelInject is no longer supported. Remove Assisted from the SavedStateHandle constructor parameter, if it exists Remove the old androidx. To reveal oneself would be to receive a discharge, though there was denial of such practices.

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