android ClassNotFoundException: Didn't find class

Question

    02-28 01:49:27.741: E/AndroidRuntime(23024): FATAL EXCEPTION: main
    02-28 01:49:27.741: E/AndroidRuntime(23024): java.lang.RuntimeException: Unable to instantiate         


        

Answer 1

I have the same problem today，because my library include the android-support-v4.jar not matching with my demo. I deleted the library's android-support-v4.jar and copied my demo's jar putting it in my library and it started to work.