How to add new activity to existing project in Android Studio - "Project not ready"

Question

What needs to be done to add a new activity to existing project that works and compiles but has "Project not ready" in the menu. Please see the picture.

Other than that all works, so I don't know what IDE means by "Project not ready"

Answer 1

This is a little bit over a year but i thought i would provide an answer for anyone (novice like me) who may encounter the same problem. I had the exact same problem as depicted and denoted. It was fixed by

• Cleaning the project (Build --> Clean Project)
• Sync with Gradle ( Tools --> Android --> Sync project with Gradle files)

Answer 2

What I did to solve this was to open up specifically the Android project in a new Android studio instance (not from the flutter project, which has everything)

Note if you don't see the option to do this in your project -> flutter options

Then you can just open the folder containing the project, followed by opening up the Android project specifically from there.

Now you should get the options