NoClassDefFoundError on external library project for Android

Question

I use eclipse for Google Android development.

I\'ve created a library project ([x] Is Library in the Android-settings), which includes an external jar-f

Answer 1

Another thing to pay attention to is library package names.

If you are using ADT21 and you happen to have libraries that have the same package name, there will be error during compile but it will still compile and run in Eclipse, giving you an APK that is missing some of the resource classes. Hence the crash when you run the app.

If you compile it with ANT then you can see the compile error that says two or more libraries use the same package name.

To fix this, rename your library project by using Android Tools -> Rename Application Package. Then everything will go back to normal.

It took me almost entire day to figure this out...