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buildscript {
    ext.kotlin_version = '1.3.0'
    ext.support_library_version = '27.1.1'
    ...
}
...

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abstract class NavigationFragment : Fragment() {
    lateinit var navigationDelegate: NavigationDelegate
    override fun onAttach(context: Context?) {
        super.onAttach(context)
        if (context is NavigationDelegate) {
            navigationDelegate = context
        } else {
            TODO("Make a custom error or something to be clear what this is suppose to do")
        }
    }

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interface NavigationDelegate {
    //TODO need a way to pass parameter
    fun navigate(from: Scene, to: Scene)
}
enum class Scene {
    ENTER_LOFT,
    CREATION,
    JOINING,
    WHAT_IS_LOFT
} 

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dependencies {
    implementation project(path: ':common')
    implementation project(path: ':api')
    implementation project(path: ':onboarding')

    ...
}

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org.gradle.parallel=true

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sealed class Transition {
    class WhatIsToEnter : Transition()
    class EnterToCreation : Transition()
    class EnterToJoining : Transition()
    class Joining2WaitForConfirmation : Transition()
}

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override fun navigate(transition: Transition) {
    val actionId = when (transition) {
        is Transition.WhatIsToEnter -> R.id.action_whatIsLoftFragment_to_enterLoftFragment
        is Transition.EnterToCreation -> R.id.action_enterLoftFragment_to_creationFragment
        is Transition.EnterToJoining -> R.id.action_enterLoftFragment_to_joiningFragment
        is Transition.Joining2WaitForConfirmation ->
            R.id.action_joiningFragment_to_waitForConfirmationFragment
    }
    findNavController(R.id.nav_host_fragment).navigate(actionId)
}

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class SomethingActivity extends AppCompatActivity {
  @Override
  void onCreate() {
    super.onCreate();
    setContentView(R.layout.activity_something);
  }
  
  @Override
  void onResume() {
    retrofitService.someApiEndpoint().enqueue(this);

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class SomeAdapter(
  val factory1: ViewHolderFactory1,
  val factory2: ViewHOlderFactory2
): RecyclerView.Adapter<RecyclerView.ViewHolder>() {
  override fun getItemViewType(position: Int) = if (position == 0) 1 else 2
  
  override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) = when (viewType) {
      1    -> factory1.createViewHolder(parent)
      2    -> factory2.createViewHolder(parent)
      else -> error("This should not be possible")

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interface ViewHolderFactory {
  fun createViewHolder(parent: ViewGroup, onClick: () -> Unit): ViewHolder
}

class ViewHolderFactoryImpl1 : ViewHolderFactory {
  override fun createViewHolder(parent: ViewGroup, onClick: () -> Unit): ViewHolder = TODO("")
}

class ViewHolderFactoryImpl2 : ViewHolderFactory {
  override fun createViewHolder(parent: ViewGroup, onClick: () -> Unit): ViewHolder = TODO("")