Manual Dependency Injection

appmodule.kt

class TitanApplication : Application(), ApplicationComponentOwner {
  override lateinit var component : ApplicationComponent
  
  fun onCreate(){
    component = ApplicationComponentImpl()
  }
  
  
}

class ApplicationComponentImpl : ApplicationComponent {
 
   override val mainActivityInterface : MainActivityInterface = MainActivityInterfaceImpl()
  
}

class MainActivityInterfaceImpl : MainActivityInterface {
  
    override fun show(context : Context){
      context.startActivity(intent, MainActivity::class) 
    }
  
}

coremodule.kt

abstract class BaseActivity : AppCompatActivity {
 
   fun applicationComponent() : ApplicationComponent {
       return (applicationContext as ApplicationComponentOwner).component
   }
   
   fun callMainActivity(){
       applicationComponent().mainActivityInterface.show(context) 
   }
  
}

interface MainActivityInterface {
   fun show(context : Context) 
}

interface ApplicationComponent {
  val mainActivityInterface : MainActivityInterface
}

interface ApplicationComponentOwner {
  val component : ApplicationComponent 
}