I have a library project in Android Studio that has been working fine, but today I went to work on it and all of the files are missing except for a few git files. The folders/fi
Go to File > Project Structure > Project Settings > Modules.
Click on the green colored + and add new module. select Application module and set the content root to your project module.
Click next and then finish.
This should do the trick and the complete project structure will appear. It worked for me.