I'm not an Android developer, but I plan to learn this along with the Kotlin language. The Android Studio seems to have proprietary components and therefore marked as non-FOSS on Flathub store. The Android SDK specifically (at least builds provided by Google) is also seems to be licensed under non-FOSS license.

Android Studio is a powerful IDE with rich toolbox for Android development, but it feels like strong lock-in on closed technology even in case we have Android as a FOSS platform in face of AOSP.

I'm just curious to learn, is Android development can be setup to be 100% FOSS? What environment, toolchain, and editors like IntelliJ IDEA CE/VSCodium/Neovim we can possibly use to achieve this?