NavigatorSync.kt

class NavigatorSync(private val topActivityProvider: TopActivityProvider) : Navigator  
  override fun startUserDetail(login: String) {
    topActivityProvider.topActivity?.let { activity -> UserDetailActivity.start(activity, login) }
  }

  override fun showSettings() {
    topActivityProvider.topActivity?.let { activity -> SettingsActivity.start(activity) }
  }
}