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Learn how to correctly configure your Android/Kotlin library module to enable `Explicit API` mode for better type safety and clearer API contracts.
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How to Enable Explicit API Mode in Your Android/Kotlin Library Module

If you're an Android developer working with Kotlin, you may have encountered situations where you want to ensure better type safety and clearer API contracts in your library modules. One way to achieve this is by enabling Explicit API mode. But what if Android Studio is not cooperating? In this post, we’ll explore how to effectively enable Explicit API mode in your Kotlin library module and troubleshoot some common issues you may face during the process.

Understanding Explicit API Mode

Before we dive into the solution, let’s clarify what Explicit API mode is. It is a feature introduced in Kotlin that enforces explicit declarations for public API members. By enabling this mode, you can catch potential issues early in the development process, leading to more robust code and clearer intent in your APIs.

Common Issues When Enabling Explicit API Mode

Many developers run into challenges while trying to enable this mode. Here are a few common issues that might arise:

Placement of explicitApi(): You might try placing the explicitApi() function in various sections of your build.gradle file, and Android Studio may not acknowledge it.

Gradle Sync Failures: When you attempt to add explicitApi() inside certain blocks, it can lead to project sync failures, causing frustration.

Steps to Enable Explicit API Mode

To enable Explicit API mode successfully, follow these steps carefully:

Step 1: Modify Your build.gradle File

Open your module's build.gradle file.

Locate the android { ... } block. This is where you'll make the necessary changes.

Inside the android { ... } block, specify Kotlin options. You should add the freeCompilerArgs property to include the necessary flag. Here’s the code to insert:

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Step 2: Sync Your Project

After making the changes, sync your Gradle project. You can do this by clicking on the “Sync Now” option that appears in Android Studio or by using the “Sync Project with Gradle Files” button.

Step 3: Verify the Changes

Check for any warnings in your code. If you see warnings or any errors related to Explicit API, it means the configuration is successful. Review the messages to understand what needs to be addressed in your API.

Conclusion

Enabling Explicit API mode in your Android/Kotlin library module is a simple yet powerful step toward creating safer and clearer code. By following the steps outlined above, you should be able to successfully configure your project and start enjoying the benefits of explicit API declarations.

If you continue to encounter issues, make sure that you're using the correct versions of Android and Kotlin that support these features, and always keep your IDE up to date.

Happy coding!