Btukfyl

I inject my dependencies in Activities and Fragments on the preferred way with AndroidInjection.inject(this). I have the recommended ViewmodelFactory to inject the viewmodel. My injections are working in Activities and Fragments. However I face a problem with BottomSheetDialogFragment, because I am not allowed to specify BottomSheetDialogFragment as this. So my @Inject lateinit var viewModelFactory: ViewModelFactory is not initialized. I believe that injection should be possible because the BottomSheetDialogFragment should be subclass of the Fragment class, but it looks like it is not. I use android.x which I believe can cause also problem. Is that possible that it is not supported by Dagger yet?

What way should I implement my ViewModelFactory injection?

Update: When I try to inject a fragment with AndroidInjection.inject(this), it is not possible either with the androidx.fragment.app.Fragment only with android.app.Fragement. I extend my Fragments with DaggerFragment and they work as expected.

Here is how I have provided ViewModel into BottomSheetDialogFragment().
First of all set up Dagger in MyApp class.

class MyApp : Application(), HasActivityInjector, HasSupportFragmentInjector {



@Inject

lateinit var activityInjector: DispatchingAndroidInjector<Activity>

@Inject

lateinit var supportFragmentInjector: DispatchingAndroidInjector<Fragment>



override fun onCreate() {

    super.onCreate()



    initDagger()

}



override fun activityInjector(): AndroidInjector<Activity> = activityInjector



override fun supportFragmentInjector(): AndroidInjector<Fragment> = supportFragmentInjector



private fun initDagger(){

    DaggerAppComponent

        .builder()

        .application(this)

        .build()

        .injectApp(this)

}

Then AppComponent class

@Singleton

@Component(

modules = [

    AppModule::class,

    UiModule::class,

    AndroidSupportInjectionModule::class,

    AndroidInjectionModule::class

])interface AppComponent : AndroidInjector<MyApp> {



   @Component.Builder

   interface Builder {

       @BindsInstance

       fun application(application: MyApp): Builder



       fun build(): AppComponent

   }



    fun injectApp(app: MyApp)

}

Here we interested in UiModule::class

@Module

abstract class UiModule {



    @Binds

    abstract fun bindViewModelFactory(factory: ViewModelFactory): ViewModelProvider.Factory



    @PerFragment

    @ContributesAndroidInjector(modules = [(FilterModule::class)])

    abstract fun contributeFilterFragment(): FilterFragment

}

you already have ViewModelFactory , so I don't paste this code.
Then FilterModule

@Module

abstract class FilterModule {



   @Binds

   @IntoMap

   @PerFragment

   @ViewModelKey(FilterViewModel::class)

   abstract fun bindViewModel(viewModel: FilterViewModel): ViewModel

}

and finally FilterFragment and FilterViewModel

class FilterFragment : BottomSheetDialogFragment() {



   @Inject

   lateinit var factory: ViewModelProvider.Factory



   private lateinit var binding: FragmentFilterBinding

   private lateinit var viewModel: FilterViewModel



   override fun onAttach(context: Context?) {

       AndroidSupportInjection.inject(this)

       super.onAttach(context)

   }



   override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {

       binding = getDataBinding(inflater, R.layout.fragment_filter, container)

       viewModel = getViewModel(factory)

       binding.viewModel = viewModel

       return binding.root

   }

}



class FilterViewModel @Inject constructor(private val testUseCase:TestUseCase) : BaseViewModel() {

     //do something

}

fragment_filter layout

<layout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:bind="http://schemas.android.com/tools">



<data>



    <variable

        name="viewModel"

        type="com.myapp.presentation.screen.filter.FilterViewModel" />

</data>

   .......

getDataBinding() and getViewModel() are extension functions

fun <T : ViewDataBinding> Fragment.getDataBinding(inflater: LayoutInflater, @LayoutRes layoutId: Int, container: ViewGroup?): T =

    DataBindingUtil.inflate(inflater, layoutId, container, false)



inline fun <reified T : BaseViewModel> Fragment.getViewModel(factory: ViewModelProvider.Factory = ViewModelProviders.DefaultFactory(activity!!.application)): T =

    ViewModelProviders.of(this, factory).get(T::class.java)

Try extending Injectable

class BottomSheet : BootomSheetDialogFragment(), Injectable 

I think this will solve the issue