Unsupported Modules Detected: Compilation is not supported for following modules: GettingStartedFirebase, app. Unfortunately you can't have non-Gradle Java modules and Android-Gradle modules in one project. code example

Example: capacitor-android. Unfortunately you can't have non-Gradle Java modules and Android-Gradle modules in one project

1- close the project

2- close Android Studio IDE

3- delete the .idea directory

4- delete all .iml files

5- open Android Studio IDE and import the project

Answer from here

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Java Example