How to Exclude Activity files in CodeCoverage in Android studio 1.2 RC

I using Android Studio 1.2RC version ,I creating code coverage Report for my unitTestcases . I am giving testCoverageEnabled = true in app.gradle file. i am able to succesfully create the codecoverage report when i type ./gradlew CreateDebugCoverageReport My question is how to exclude some classes that i dont want to cover the testreport (eg:SplashScreenActivity) Thanks in advance