android force close: ClassNotFoundException for Activity class

Question

When I start my (soon-to-be) android game (from eclipse) it opens, but immediately force-closes.

Logcat says:

07-09 17:12:35.709: ERROR/AndroidRuntim         


        

Answer 1

I had this problem once when my working application suddenly started throwing ClassNotFoundException. The problem was that the classes were not being compiled and translated to the "dex" file, this is obvious to find because the APK just shrinks.

So, in eclipse, in order to fix it just add the javabuilder to your .project file.

  org.eclipse.jdt.core.javabuilder
  
  

Hope it helps.