Resolving :transformClassesWithMultidexlistForRelease Build Failures in Unity Android Projects

Описание: Dive into the solutions for fixing the `:transformClassesWithMultidexlistForRelease` build errors in Unity’s Android projects, ensuring successful builds without duplicate libraries.
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Resolving :transformClassesWithMultidexlistForRelease Build Failures in Unity Android Projects

If you're developing games using Unity and deploying for Android, you may encounter frustrating build errors, especially surrounding the :transformClassesWithMultidexlistForRelease task. This issue primarily surfaces when dealing with outdated dependencies and can create significant obstacles during the build process. But don’t worry—this guide will step you through detecting the root cause and effectively resolving it to get your project back on track.

Understanding the Problem

The error you are facing is typically attributed to conflicts arising from multiple versions of the same library or class being referenced within your project. In this specific case, the error log reveals a Program type already present message. This indicates that there are duplicate classes in the libraries included in your project.

Key Signs of the Issue:

Execution failure for :transformClassesWithMultidexlistForRelease

Error messages indicating duplicate program types.

To get detailed insights into the conflicting libraries, you will need to explore the gradle output more closely.

Step-by-Step Solution

Follow these steps to identify and resolve the conflict that's causing your build to fail:

1. Export the Gradle Project

In Unity, navigate to Build Settings and choose the option to export your project as a Gradle project.

Make sure to select the appropriate gradle version that your Unity installation uses. This often means avoiding newer versions that may not be compatible with Unity's features.

2. Run Gradle with the Debug Option

Once the project is exported, navigate to the project directory on the command line.

Use the command:

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

This will provide you with detailed output pointing out where the error lies.

3. Analyze the Stack Trace

Examine the output, especially looking for lines indicating duplicate classes. The log will often present paths to conflicting libraries, like in your case with com.google.auto.value.extension.memoized.Memoized.

4. Identify the Conflicting Libraries

Use a utility to unzip all .jar and .aar files found in your APK directory. You might want to automate this with a script if you are comfortable with scripting, or do it manually for fewer files.

Search through the unzipped contents of your libraries for the class or packages indicated in the gradle output.

5. Evaluate and Remove Duplicates

Once you identify which libraries contain the duplicate classes, it's time to remove them. In your specific case, an outdated copy of one of the libraries included through ExternalDependencyManager was to blame.

Either update these libraries to their latest versions or remove them entirely from your Unity project if they are not needed.

6. Rebuild Your Project

After making the necessary changes to your dependencies, return to Unity, and rebuild your project.

If you've successfully resolved the inconsistencies, the build should complete without errors.

Final Thoughts

Cleaning up old dependencies in a Unity project can save a lot of headache, especially when it comes to building for Android. With the proper identification of conflicts and removal of outdated libraries, you can not only fix your current build issues but also prevent them in future updates.

By following this comprehensive approach, you should be able to address the :transformClassesWithMultidexlistForRelease failure effectively and keep your game development process moving smoothly.

If you have any thoughts or tips that worked for you in similar situations, feel free