Android: Unable to instantiate activity / ClassNotFoundException

Question

I recently published an app to the market and I\'m now getting an error by some user, the app presumably crashes right when it starts. Unfortunately I can\'t contact him dir

Answer 1

What I had to do is just re-do the building/exporting process with no modification to the code whatsoever. It worked for me, which I did was to export it two times. On my first export, the build APK has lower file size and the second export (with no any modification to the code/configuration) produced a slightly larger file size (about 200KB diff).

This bug in building is really costly, kills you in front of your manager, and should be really fixed by Android/Eclipse team. Kind of sucks

Answer 2

This problem can also occur if you have a constructor with one or more parameters in your activity class.

Answer 3

I had the same problem I solved it by uncheck the Android Dependencies from Project--> Properties-->Java builder Path-->android dependencies

Answer 4

I don't know why the path in the PathClassLoader is different to your package name but when testing on the emulator try forcing a close then run it again, as per this link

Answer 5

Look at the package defined at the top of the manifiest file and make sure that it matches the package where you class is defined.

My problem was that I did not have matching package names.

Also enusre that you have a folder named "libs" with an 's'. Put all of you jar files that you added inside it and add to build path.

Answer 6

I fix this problem by deleting "bin" and "gen" folder, and rebuilding project.