Android resources not found in Flutter project
When your Flutter project is open in Android Studio, it doesn’t seem to respect all of the Android conventions in the android subfolder of the Flutter project.
As was noted in the comment link, though, you can go to File > Open and open the android folder. This will recognize it as an Android project and the resource errors should be gone.
That said, you don’t need to open it as an Android project. You can just ignore the “errors” and it should work.
If you like this question & answer and want to contribute, then write your question & answer and email to freewebmentor[@]gmail.com. Your question and answer will appear on FreeWebMentor.com and help other developers.