What makes it complicated to package all of these Android SDK tools is that the source code is organized into semi-arbitrary "projects" that are split up between many different git repos. Those git repos are then all checked out at the same time using Google's crazy `repo` tool. Then the entire Android OS and SDK are built using a single, unified build system that requires something like 8 gigs of source code be downloaded.
This 'android-tools' package, like Arch's 'android-tools' package, was created by manually copying various source files into this package's git repo. When trying to build the whole Android SDK, that would be a massive amount of work to maintain. For more info, follow the team's progress here: https://wiki.debian.org/AndroidTools
