How to Resolve a NoClassDefFoundError in Android Projects?

NoClassDefFoundError in Eclipse and Android Projects: Resolve Missing Class Definitions

Your Android app has encountered a NoClassDefFoundError after adding an external library to its build path. This error suggests that the runtime is unable to locate the com.scoreninja.adapter.ScoreNinjaAdapter class.

Troubleshooting Solution:

While the automated build scripts typically handle library dependencies, it's possible that the recent addition has caused a conflict. Follow these steps to resolve the issue:

1. Remove old references: Remove the scoreninja.jar from Eclipse's build path.
2. Rename library folder: Change the directory containing all JAR files from "lib" to "libs". This follows the Ant convention and is now recognized by ADT.
3. Add libraries back: Re-add the updated "libs" folder to the build path.
4. Clean and rebuild: Clean and rebuild the project to ensure the latest library dependencies are included.

In most cases, this solution recreates the necessary dependencies and should resolve the NoClassDefFoundError. Remember to check if the JAR or library you added contains the missing class and that it's compatible with the project's Android version.

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