gistfile1.groovy

android.applicationVariants.each { variant ->
    def aptOutput = project.file("apt_generated/${variant.dirName}")
    
    variant.javaCompile.doFirst {
        variant.javaCompile.options.compilerArgs += [
                '-processorpath', configurations.compile.getAsPath(),
                '-s', aptOutput
        ]
        variant.javaCompile.source = variant.javaCompile.source.filter { p ->
            return !p.getPath().startsWith(aptOutput.getPath())
        }
    }
}
android.sourceSets.debug.java.srcDirs+= "apt_generated/debug"
android.sourceSets.release.java.srcDirs+= "apt_generated/release"