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Discover effective solutions for the `duplicate class error` in Android Studio projects, ensuring smooth development and debugging.
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How to Resolve the Duplicate Class Error in Your Android Studio Project

Creating a new project in Android Studio can be an exciting venture, filled with endless possibilities for app development. However, running into errors such as the Duplicate Class Error can be incredibly frustrating and may stall your progress. In this post, we will explore what this error is, why it occurs, and, most importantly, how to resolve it effectively.

Understanding the Duplicate Class Error

Upon creating a new project with a Bottom Navigation View Activity, you might encounter an error message similar to this:

[[See Video to Reveal this Text or Code Snippet]]

This error indicates that there are conflicting versions of Kotlin libraries within your project dependencies. Specifically, two versions of Kotlin's standard library are included, leading to the duplication issue.

Why Does This Happen?

Duplicates usually occur when you have conflicting dependencies that bring in different versions of the same library. In this case, you have kotlin-stdlib version 1.8.20 and kotlin-stdlib-jdk8 version 1.6.21 appearing together, which leads the compiler to be confused about which one to use.

How to Resolve the Duplicate Class Error

To eliminate this duplicity and allow your project to build successfully, you can specify constraints within your build.gradle file. Below are the steps you should follow:

Step 1: Open the build.gradle file

Locate and open the build.gradle file for your project.

Step 2: Add Constraints to Dependencies

Modify the dependencies section by adding a constraints block. Here’s how to do it:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Sync the Project

After making these changes, sync your project with Gradle. This will allow the new dependency constraints to be recognized, thus resolving the conflict.

Conclusion

By adding a constraints block in your build.gradle file, you effectively inform the Kotlin Gradle plugin to avoid using duplicate classes from different versions. This is a crucial fix that ensures smooth running of your project without errors.

If you encounter any further issues, it might be a good idea to review your dependency tree with Gradle or consider updating your libraries to their latest versions, as conflicts often arise from outdated or incompatible dependencies. Happy coding!