FabulousActivity.kt

class FabulousActivity : Activity(), FabulousListener {

  companion object {
      fun newIntent(context: Context): Intent = Intent(context, FabulousActivity::class.java)
  }
  
  override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
    
      // Commit FabulousFragment instance into FragmentManager
  }
  
  override fun onAttachFragment(fragment: Fragment) {
      super.onAttachFragment(fragment)
      when (fragment) {
          is FabulousListener -> fragment.listener = this
      }
  }
  
}