I don't understand why this was getting downvoted? The parent commenter is right. You can build on the command line with gradle. It will still download hundreds of megabytes worth of dependencies (the Android SDK etc). But at least you don't need any GUI tools.
It's an SDK for an entire OS, plus the emulator (basically the whole OS in a VM), developer tools and more. It's not much different in size than the SDKs for macOS or Windows and it's much more cohesive.
