You can launch a package from the command line once an emulator is started (not sure if it also works this way for the real device) and the game will start regardless of whether you're on the login screen or not. Assuming you have the android tools …
I've been using sbt (http://www.scala-sbt.org/) to build my project from the command line. It's a Scala build tool but you can use it to build Java projects just fine, and there is an android-specific plugin for it: https://github.com/jberkel/androi…
