Noclassdeffounderror on External Library Project for Android

NoClassDefFoundError on external library project for Android

It has been clearly stated in offcial API here:

A library project can include a JAR library

You can develop a library project that itself includes a JAR library, however you need to manually edit the dependent application project's build path and add a path to the JAR file

The jar lib must be manually added to the dependent application project's build path, not only the library project build path itself.

Update from SDK r17:

This is automatically handled by ADT now, check out new feature for ADT 17.0.0 release here:

Added feature to automatically setup JAR dependencies. Any .jar files in the /libs folder are added to the build configuration (similar to how the Ant build system works). Also, .jar files needed by library projects are also automatically added to projects that depend on those library projects. (more info)

java.lang.NoClassDefFoundError with external jars in Android project

Make sure you've updated to the latest version of ADT Eclipse plugin and SDK Tools and also make sure "Android Dependencies" is checked in your project properties.

ClassDefNotFound exception using android library project as reference

I think your activity EZImageActivity is declared in liberary manifest.Actual case androidManifest.xml merging is supported in version 20 of the ADT tools.
Enable with the manifestmerger.enabled property.

more details

Android Eclipse NoClassDefFoundError for external .jar files

You need to read this - Dealing with dependencies in Android projects.

This link is also useful - ClassDefNotFoundError with ADT 17

Basically, create a folder called libs and place all of your jar files inside. The recent update will automatically take care of the rest for you. You don't need to edit your path anymore.

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