Fixing Rxjava3 Issues When minifyEnabled is Set to True in Android

Описание: Discover how to resolve issues with `Rxjava3` not functioning as expected in your Android app when `minifyEnabled` is set to true. This guide provides a step-by-step solution for developers.
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Resolving Rxjava3 Issues when Minify Enabled in Android

Are you having trouble with Rxjava3 not functioning correctly when you enable minifyEnabled in your Android app's build.gradle file? Many developers encounter similar issues. When minifyEnabled is set to true, it often leads to unexpected behavior, including RxJava not executing as anticipated. In this guide, we’ll delve into why this happens and how you can fix it effectively.

Understanding the Problem

When you set minifyEnabled to true in your project's build.gradle, the code is minimized and obfuscated for optimization. This process can inadvertently strip away necessary parts of the code, especially when using libraries like RxJava. In the reported case, despite getting correct logs and API responses, the onSuccess method of your RxJava Single not returning the correct value is a common manifestation of this issue.

Steps to Reproduce the Issue

Create a new project and import Rxjava3 (version 3.0.13).

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Modify the buildTypes in build.gradle:

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Implement the onCreate method in MainActivity.java:

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Set a breakpoint in onSuccess, connect your device and press debug.

With minifyEnabled set to true, you find that instead of getting "Test", you receive a null value. Disabling minifyEnabled resolves the issue, indicating that ProGuard is stripping out necessary information.

Proposed Solution

To remedy the problems arising from minifyEnabled, you can adjust the ProGuard rules. It's crucial to ensure that necessary classes remain intact during the obfuscation process.

Suggested Proguard Rule Addition

In your ProGuard configuration file (proguard-rules.pro), you should include the following line instead of -dontwarn java.util.concurrent.Flow*:

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This rule tells ProGuard to ignore warnings that may arise from classes within the java.util.concurrent package, which includes RxJava's internal flow management. This small adjustment can help retain functionality when using RxJava in a minified build environment.

Conclusion

Enabling minifyEnabled is a great way to optimize your Android application, but it can lead to issues with certain libraries like RxJava. By following the steps outlined in this post, you can mitigate these issues and ensure that your RxJava code behaves as expected, even when minified. Always remember to test your configurations thoroughly to catch any potential issues before deployment.

Implementing the correct ProGuard rules is key to maintaining functionality with libraries that rely heavily on reflection and code generation, such as RxJava. Happy coding!