In my Android Studio Gradle project I use several libraries, whereas one library should use a local AAR file as dependency. I used the popular solution to include the AAR file a
I wanted to add my AAR file to my library project. I had to add this to the gradle of my library project
implementation(files("libs/sublibrary.aar"))
where my 'libs' folder is located at myLibraryName/libs.
I also had to add the following to the gradle of my Main project
implementation(files("../myLibraryName/libs/sublibrary.aar"))
Then I synced and it worked.