How to Resolve Duplicate Class Error: com.google.common.util.concurrent.ListenableFuture in jetified-guava-26.0-android.jar

What steps should I take to resolve the duplicate class error 'com.google.common.util.concurrent.ListenableFuture' found in modules jetified-guava-26.0-android.jar?

// No specific code snippet applicable here, as this issue is related to dependencies.

The 'Duplicate class com.google.common.util.concurrent.ListenableFuture' error typically arises when there are conflicting dependencies in your Android project. This issue often occurs when different libraries reference the same class from different versions of the Guava library, causing a duplicate definition. Android uses Gradle for dependency management, making it important to resolve these conflicts to ensure a successful build.

// Example of excluding a specific module in Gradle build file
implementation ('com.example:some-library:1.0') {
    exclude group: 'com.google.guava', module: 'guava'
}

Causes

• Conflicting dependencies that both include Guava library.
• Multiple versions of the Guava library being included via different libraries or modules.
• Improper dependency resolution due to incorrect configuration in build.gradle files.

Solutions

• Identify the conflicting dependencies by using the command `./gradlew app:dependencies` to list all dependencies and their versions.
• Exclude the Guava library from one of the dependencies in your build.gradle file using: implementation ('some.dependency') { exclude group: 'com.google.guava', module: 'guava' }
• Align all libraries that use Guava by ensuring they reference the same version, ideally the latest stable version.
• Consider using the `implementation` or `api` keywords instead of `compile` to manage dependencies more effectively in Gradle.

Mistake: Not checking for duplicate dependencies in the project.

Solution: Always run `./gradlew app:dependencies` to verify dependency trees.

Mistake: Excluding the wrong version of Guava or similar classes.

Solution: Carefully confirm which dependencies are causing conflicts before excluding them.

Mistake: Neglecting to sync the project after making changes to build.gradle.

Solution: Remember to click 'Sync Now' in Android Studio after modifying build files.