MainActivity.kt

class MainActivity : FragmentInjectActivity() {

    @Inject lateinit var vmFactory: ViewModelProvider.Factory
    private val viewModel by viewModels<MainViewModel> { vmFactory }

    @Inject lateinit var fragmentFactory: FragmentFactory

    override fun beforeOnCreate() {
        supportFragmentManager.fragmentFactory = fragmentFactory
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        supportFragmentManager.beginTransaction()
            .add<DummyFragment>(R.id.fragmentContainer)
            .commitAllowingStateLoss()
    }
}