Android Studio: This file not part of the project, but the project builds successfully

Question

I have a strange problem that suddenly appeared in android studio. I created a new cpp file, and included it in Android.mk. Then I synced the project. However, android studi

Answer 1

Had the same problem with Android Studio 4.0.1 and the latest gradle at this time (6.1.1?). The problem went away after I exited Android Studio and deleted .gradle and .idea folders in the project main directory, plus deleted .cxx and build directories in the affected module directory. I'm not sure which really helped, but most probably deleting .grade and/or .idea