Android Studio: ClassNotFoundException

Question

i was busy with my app for over a week, when suddenly:

11-12 07:59:17.860    1653-1653/nl.test.myapp E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.Runtim         


        

Answer 1

In my case it was manifest declaration of android.app.Application in project and actual code in module.

Answer 2

Looks like you have a namespace typo somewhere. Search for MyApp and change it to myapp.

Answer 3

I created a new project in Android studio and copied everything from the old project into the new one. Now it's working again, without any(!) modifications to the code.

Answer 4

I had the similar problem. I remembered, that previously "not enough memory" message was shown and the application uploading process could not finish, stopping on dexDebug with error. Then I released enough memory, but application started with ClassNotFoundException.
The solution that worked for me was to delete all "build" folders in the project. I suppose that gradle can put corrupted files to "build" folder when there is not enough memory.

Answer 5

GO to Build Menu and Clean Project.

The above solution worked perfectly fine for me.

Answer 6

When using Android Studio, please ensure that the "src" folder that contains your Java class is marked as "Source Root". Otherwise, it will not make it into the APK.