I have followed the tutorial at Scala and Android with Scala 2.7.3 final. The resulting Android App works but even the most basic application takes several minutes
I verified this detailed solution with Eclipse 3.7, Scala 2.10 and the plug-in AndroidProguardScala v50:
https://stackoverflow.com/a/11084146/1287856
Everything works fine. A simple test application with scalafied main activity class only takes 38Kb. Libraries projects are supported. Proguard is activated when exporting the project.