Prerequisites

• Working Android SDK installation
• Working Eclipse installation
• Working ADT installation

Details

With the prequisites satisfied, all that remains is installing Scala IDE and Treeshaker.

• Select "Install new software" in Eclipse.
• Add the site http://download.scala-ide.org/releases-28/2.0.0-beta (recommended) or http://download.scala-ide.org/update-1.0.0-milestones-2.8.1.final/ (please note that Scala 2.9 will break the Android build tools)
• Install "Scala IDE for Eclipse"

• Select "Install new software" in Eclipse.
• Add the site http://treeshaker.googlecode.com/svn/trunk/update_site/
• Install "Treeshaker"