Android Eclipse NoClassDefFoundError: How Can I Fix It?

NoClassDefFoundError: Resolving the Issue in Android with Eclipse

Encountering a NoClassDefFoundError when running an Android app can be frustrating, especially after adding external libraries. This article addresses this issue, providing a solution to resolve it in Eclipse.

Typically, Eclipse generates build scripts for Android projects. However, when a NoClassDefFoundError occurs, it can indicate a problem finding a specific class within an external library. In this particular case, the error was related to a "com.scoreninja.adapter.ScoreNinjaAdapter" class, suggesting that the Scoreninja JAR library was not being properly referenced by the project.

To resolve this issue, the user followed a recommendation that involved rearranging the organization of their external libraries. Instead of storing JAR files in a "lib" folder and adding them manually to the build path, they renamed the "lib" folder to "libs." This convention conforms to Android ant build standards and is recognized by the latest version of ADT (Android Development Tools).

After renaming the folder, the user's error was resolved, and the app ran successfully. This indicates that ADT automatically includes libraries located within the "libs" folder in the app's .apk file.

If you encounter a NoClassDefFoundError when running an Android app in Eclipse, remember to check the following:

• Ensure that external libraries are stored in a "libs" folder at the root of your project.
• Remove external libraries from the build path and let ADT automatically include them from the "libs" folder.
• Restart Eclipse and clean/rebuild your project to propagate changes.

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