“Default Activity Not Found” on Android Studio upgrade

Question

I upgraded IntelliJ Idea from 12.0.4 to 12.10.

Now all the modules in my Android project give the error:

Error: Default Activity Not Found

Answer 1

In my case File -> Invalidate Caches / Restart... didn't help

Everything was ok with my project and of course I had next intent filter for my activity

What really helped me is deleting Android/Gradle cache folders (they can grow up to 10-30 GB)

Go to C:\Users\YOUR_USER_WINDOWS_NAMEand delete next folders

• .android
• .AndroidStudio3.2
• .gradle

(you may save some Android configs from .AndroidStudio3.2 before deleting it if you want it)

You can create bat file CLEAR_CACHE.cmd like this to delete folders without Recycle Bin

rmdir /S /Q .android
rmdir /S /Q .AndroidStudio3.2
rmdir /S /Q .gradle

it would work much faster and you don't have to delete it also from Recycle Bin

p.s. put CLEAR_CACHE.cmd into C:\Users\YOUR_USER_WINDOWS_NAME

it's also a good idea to delete Android Studio folder and download it again