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Achieving ActivityComponent and SingletonComponent Relationship in Hilt Module Class

Learn how to effectively use Hilt module classes to bind relationships for `ActivityComponent` and `SingletonComponent` in your Android applications. --- This video is based on the question https://stackoverflow.com/q/77171686/ asked by the user 'Tajuddin Khandaker' ( https://stackoverflow.com/u/5860233/ ) and on the answer https://stackoverflow.com/a/77171790/ provided by the user 'zmunm' ( https://stackoverflow.com/u/7701297/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: ActivityComponent and SingletonComponent relations together in hilt module class Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Understanding the Relationship Between ActivityComponent and SingletonComponent in Hilt Modules When working with dependency injection in Android using Dagger Hilt, you may come across a common issue: how to manage bindings in a single module for both ActivityComponent and SingletonComponent. This problem arises when you need to provide different lifecycle scopes for the same interface. Let's break down how to tackle this problem in a structured manner. The Problem You might find yourself in a situation where you want to define some dependencies for your application's singleton lifecycle and others for your activity lifecycle within the same Hilt module. For example, consider a module where the requirements are as follows: Bind an implementation of SomeInterface for an activity-scoped lifecycle. Bind another implementation of SomeInterface for the application-scoped lifecycle. Your initial attempt might look like this: [[See Video to Reveal this Text or Code Snippet]] However, this structure can lead to confusion or conflicts over which implementation to use in different scenarios. Therefore, we need to split the bindings into separate modules. The Solution: Individual Module Installation To effectively manage these different lifecycle bindings, the solution is to create individual Hilt modules for each component: one for the ActivityComponent and another for the SingletonComponent. This approach keeps things clear and manageable. Here's how you can do it: Step 1: Create Modules for Each Component Activity Component Module [[See Video to Reveal this Text or Code Snippet]] In this module, we bind SomeImpl specifically for the ActivityComponent. This means anytime you request SomeInterface with @ SomeQualifier within an activity, you'll get an instance of SomeImpl, which has a lifecycle tied to that activity. Singleton Component Module [[See Video to Reveal this Text or Code Snippet]] Here, we define a second module to bind AnotherImpl for the SingletonComponent. This will provide a singleton instance of SomeInterface across the entire application whenever @ AnotherQualifier is used. Step 2: Utilizing the Bindings in Your Application Once you’ve created these two separate modules, you can easily request your implementations in activities and in other parts of your app where the application scope is required. This modular strategy results in clear, maintainable code without any ambiguity over which instance is being injected based on scope. Summary To summarize, when faced with the challenge of binding dependencies for both ActivityComponent and SingletonComponent in Dagger Hilt: Create Separate Modules: Split your bindings across multiple modules tailored to each component’s lifecycle. Clarity in Injected Instances: This practice ensures that the correct implementations are injected in the appropriate contexts. This modularization not only provides clarity but also follows best practices in dependency management in modern Android applications. By adopting this strategy, you ensure that your application remains robust, scalable, and easy to understand for future developers who may work on your project.