Скачать или смотреть Resolving Dagger Hilt Dependency Injection Errors for @ ActivityContext in Android Adapters

Discover how to solve the `@ ActivityContext` injection problem in your Android project using Dagger Hilt with this informative guide.
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This video is based on the question https://stackoverflow.com/q/62850811/ asked by the user 'Naresh NK' ( https://stackoverflow.com/u/9854554/ ) and on the answer https://stackoverflow.com/a/62856164/ provided by the user 'Saeid Lotfi' ( https://stackoverflow.com/u/11085663/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving Dagger Hilt Dependency Injection Errors for @ ActivityContext in Android Adapters

If you're working with dependency injection in Android using Dagger and Hilt, you might have encountered issues when trying to inject the @ ActivityContext qualifier into an adapter. This problem often arises during a setup in which context should be available specifically for activities but isn't. In this guide, we’ll dive into the error message you received and provide a clear, step-by-step solution.

Understanding the Problem

The error message you faced indicates that the framework couldn't provide the @ ActivityContext for the Context type you needed:

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This situation arises typically when the Dagger Hilt module is incorrectly set up. Specifically, your current module is installed in the ActivityRetainedComponent, which behaves differently compared to the ActivityComponent. ActivityRetainedComponent persists across configuration changes, while ActivityComponent is lifecycle-aware and is instantiated per activity.

Solution: Correcting Your Hilt Module Setup

To successfully inject @ ActivityContext into your adapter, follow these steps to adjust your Dagger Hilt module:

Step 1: Update Your Module

Change your existing Hilt module from installing in ActivityRetainedComponent to the ActivityComponent. Here's how your module should look afterwards:

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Step 2: Understand the Annotations

@ Module: Marks the class as a Dagger module to provide dependencies.

@ InstallIn(ActivityComponent::class): Installs the module in the ActivityComponent to ensure it’s tied to the activity lifecycle.

@ ActivityScoped: Indicates that the provided dependency lives as long as the activity does.

Step 3: Verify Your Adapter Implementation

Ensure that your adapter is set up correctly. The constructor should appropriately receive the @ ActivityContext and extend from a suitable base class like FragmentStateAdapter:

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This ensures that your adapter receives the correct context type during its lifecycle.

Conclusion

By following these steps, you can effectively resolve the dependency injection issue you're facing with @ ActivityContext in your Android adapter. Ensure that the scope and component match the intended behavior of your application components - especially when working in an environment as dynamic as Android, where activities can be re-created frequently.

If you have further questions or continue to experience issues, feel free to reach out in the comments below. Happy coding!