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

This error can also occur when you (at the project level) incorrectly Import > Android > Existing Android Code Into Workspace, via Eclipse. In my case, this resulted in an empty "src" folder, but then I noticed new folder starting with "java" at the root and continuing with the package path (i.e. com/zyzcorp/...), leading to the MainActivity.java file.

To test what I thought may fix the problem, I copied the com.*.MainActivity.java file into the src folder, refreshed, cleaned, and restarted Eclipse. I was able to build and run the app on the target device.