example build.sbt for a single project with many library projects

build.sbt

import android.Keys._

android.Plugin.androidBuild

name := "project-with-lib-projects"

unmanagedClasspath in Compile <<= ( baseDirectory
                                  , unmanagedClasspath in Compile) map {
  (base,cp) =>
  val ignores = Set("android-support-v4.jar", "guava-14.0.1.jar")
  (cp filterNot (c => ignores(c.data.getName))) ++ Seq(
    Attributed.blank(base / "libs" / "android-support-v4.jar"),
    Attributed.blank(base / "libs" / "guava-14.0.1.jar")
  )
}

proguardConfig in Android ~= { pc => "-dontwarn com.google.common.**" +:
  pc filterNot { _ contains "jsr305" }}

commands += Command.command("proguard")(st => {
  val extracted = Project.extract(st)
  Project.runTask(packageT in Android,
    extracted.append(Seq(
      useProguard in Android := true,
      useProguardInDebug in Android := true
    ), st)
  )
  st
})

run <<= run in Android