Hello, I've a difficult question. I use Hilt. I get  this error   'java.lang.IllegalArgumentException: SavedStateProvider with the given key is already registered'. What is the reason?

Fragment
private var instance: LoginFragment? = null
 private val viewModel by viewModels<AuthViewModel>()
 override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        binding = FragmentLoginBinding.bind(view)
        instance =this
}

fun login(): String {
    viewModel.login(clientId, partner.toString(), password)
    val clientId = binding.editTextTextEmailAddress.text.toString().trim()

    val encrypted = encrypt(clientId, publicKey)
  
    return encrypted
}

RemoteDataSource

private fun getRetrofitClient(): OkHttpClient {

    val str= LoginFragment().getInstance()?.login()

....

Hey DaggerHeads, im running into a issue where hilt doesn't allow BaseClasses with default values. For Example

abstract class BaseActivity(layouId: Int = 0) // Hilt complains that default value of 0 is not allowed

Why isn't it necessary to write @InstallIn on a class that you own and only on a module? i.e. I expected this to work

@Singleton
@InstallIn(Singleton::class)
class MyRepo @Inject constructor(val myManager: MyManager) :

Is there a way to inject a

value class

with Dagger2? It seems like it's not working... (don't think it makes a difference, but I'm using Anvil with it...)

Hello, I've a question. Why Android Studio shows "Class "App" is never used" this warning when I use Koin? Using Hilt it doesn't show this warning. As you see that I used 'App' in Manifest.

<application
    android:name=".App"
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">

class App : Application(){
    override fun onCreate() {
        super.onCreate()
        startKoin {
            androidContext(this@App)
            modules(listOf(appModule, repoModule, viewModelModule))
        }
    }
}

Update 2:

@JvmSuppressWildcards

Adding that to the constructor injection site did the trick. @ephemient thank you! 🙂 Update 1: In my use-case below

MyType

was a sealed class, which is what caused the issue. Original message: I think this question applies here even though I'm using hilt: I have a provider function that provides a kotlinflow like so:

fun provideX(): Flow<MyType>

However, when I try to compile I get "cannot be provided without an @Provides-annotated method". I'm guessing it wants a provider for MyType? I'm not sure, because it seems to work if it's:

fun provideX(): Flow<Long>

I guess in general, are there any recommendation around flows/async together with dagger/hilt?

I have an error with hilt, i dont know why. I keep getting the error:

java.lang.RuntimeException: Cannot create an instance of class app.medxpert.pgo.compose.privacy_agreement.PrivacyAgreementViewModel

The Preferences:

class Preferences @Inject constructor(
    @ApplicationContext val context: Context
) {...}

My ViewModel:

import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import dagger.hilt.android.lifecycle.HiltViewModel
import kotlinx.coroutines.flow.*
import kotlinx.coroutines.launch
import javax.inject.Inject

@HiltViewModel
class PrivacyAgreementViewModel @Inject constructor(
    private val sharedPrefs: Preferences,
) : ViewModel() {...}

How I call it:

@Composable
fun PrivacyAgreementView(
    viewModel: PrivacyAgreementViewModel = hiltViewModel()
) {

What could be wrong?

Hello, I've a question. I get this error, but I can't understand it. How can I fix it?  Thanks in advance.  "[Dagger/MissingBinding] @javax.inject.Named("vbttop") retrofit2.Retrofit cannot be provided without an @Provides-annotated method.   public abstract static class SingletonC implements App_GeneratedInjector,                          ^       @javax.inject.Named("vbttop") retrofit2.Retrofit is injected at           com.example.alwayson.di.NetworkModule.provideApiVbtop(retrofit)       com.example.alwayson.data.VbtopApi is injected at           com.example.alwayson.repository.VbtopRepository(vbtopApi)       com.example.alwayson.repository.VbtopRepository is injected at           com.example.alwayson.viewModel.MainVieModel(�, vbtopRepository, �)"

@Module
@InstallIn(SingletonComponent::class)
class NetworkModule {


    @Provides
    fun provideBuildlogger(): HttpLoggingInterceptor {
        return HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BODY)
    }


    @Provides
    @Singleton
    fun provideOkHttpClient() = if (BuildConfig.DEBUG) {
        val loggingInterceptor = HttpLoggingInterceptor()
        loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY)
        OkHttpClient.Builder()
            .addInterceptor(loggingInterceptor)
            .build()
    } else {
        OkHttpClient
            .Builder()
            .build()
    }


    @Provides
    @Singleton
    @Named("base")
    fun provideRetrofitBuilder(
          alwaysonUrl: String, okHttpClient: OkHttpClient
    ): Retrofit {
        return Retrofit.Builder()
            .addConverterFactory(MoshiConverterFactory.create().asLenient())
            .baseUrl(alwaysonUrl)
            .client(okHttpClient)
            .build()
    }


    @Provides
    @Singleton
    @Named("vbtop")

    fun provideRetrofitBuilderVbttop(
        @Named("vbttop") vbttopUrl: String, okHttpClient: OkHttpClient
    ): Retrofit {
        return Retrofit.Builder()
            .addConverterFactory(MoshiConverterFactory.create())
            .baseUrl(vbttopUrl)
            .client(okHttpClient)
            .build()
    }


    @Provides
    @Singleton
    fun provideApi(@Named("base") retrofit: Retrofit): UrlApi {
        return retrofit.create(UrlApi::class.java)
    }


    @Provides
    @Singleton
    fun provideApiVbtop(@Named("vbttop") retrofit: Retrofit): VbtopApi {
        return retrofit.create(VbtopApi::class.java)
    }


    @Provides
    fun provideBase() = BuildConfig.BASE_URL

    @Provides
    @Named("vbttop")
    fun vbttopUrl(): String = ""
}

interface UrlApi {
    @GET
    suspend fun getUrls(@Url path: String): Response<JsonData>
   
}

interface VbtopApi {
    @GET
    suspend fun getVbtop(@Url url:String): Response<VbtopUrl>
}

class MainRepository @Inject constructor(private  val urlApi: UrlApi, private  val vbtopApi: VbtopApi) {
    suspend fun getUrls(path:String) = urlApi.getUrls(path)

    suspend fun getVbtop(url:String)=vbtopApi.getVbtop(url)

}

How to provide 

viewModelScope

 as a constructor injection through hilt to other classes which are 

viewmodelscoped

Hey if you have a base Activity that is using dagger , and your migrating to hilt, is there a incremental way to handle changing it ? also do both BaseActivity and the class inherting it need to be annontated with @AndroidEntryPoint when using hilt ? Assuming your also using hilt in the base activity

This message was deleted.

This message was deleted.

I tried creating a pure Kotlin/Gradle project in Intellij to play around with dagger (currently losing my mind over it lol) But even with very simple module/component it's not working as soon as I add a simple @provides or @binds annotation inside the module I get something along the lines of:

[kapt] di.HeaterModule: Can't reference type 'Heater' from default package in Java stub.

as a warning and the error is:

error: [ComponentProcessor:MiscError] dagger.internal.codegen.ComponentProcessor was unable to process this interface because not all of its dependencies could be resolved. Check for compilation errors or a circular dependency with generated code.
public abstract interface HeaterModule {

To be clear, this is my module:

@Module
interface HeaterModule {

    //Tried both
//    @Binds
//    fun bindHeater(heater: SmallHeater): Heater
    
    @Provides
    fun provideHeater(): Heater {
        return SmallHeater()
    }
}

The component that doesn't even do anything:

@Component(modules = [HeaterModule::class])
interface TeaComponent{
//    fun teaMaker(): TeaMaker
}

And the cherry on the top where I suspect the errors to be, but can't find them i.e.

build.gradle.kts

file:

import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

plugins {
    kotlin("kapt") version "1.5.31"
    kotlin("jvm") version "1.5.10"
    application
}

group = "me.mkarwowski"
version = "1.0-SNAPSHOT"

kapt {
    generateStubs = true
    keepJavacAnnotationProcessors = true
}

repositories {
    mavenCentral()
}

dependencies {
    implementation( "com.google.dagger:dagger:2.39.1")
    annotationProcessor( "com.google.dagger:dagger-compiler:2.39.1")
    kapt( "com.google.dagger:dagger-compiler:2.39.1")

    testImplementation(kotlin("test"))
}

tasks.test {
    useJUnit()
}

tasks.withType<KotlinCompile>() {
    kotlinOptions.jvmTarget = "1.8"
}

application {
    mainClass.set("MainKt")
}

Am I doing anything obviously wrong here? I'll upload it to github in a second so You can reproduce it

Is there a way to bind a dependency twice? Once in SingletonComponent, once in ActivityComponent? In my use case I have two instances of a dependency: once in an Activity and once in a Service. The dependency itself depends on a

Context

, so I want to use the Activity context where possible. I suppose I could accomplish this binding with annotations, but I was wondering if there was another way.

Hello everyone! I want to create library, but already using Hilt in lib classes. Q: How to create library that doesn't need Hilt/Dagger from other developers? Hilt needs Application class and that is the main problem.

Is there a way to make dagger inject a

value class Id(value: String)

? it complains that it doesnt see a provider for the underlying string value

I have a RepositoryActual and RepositoryInterface. I want to use RepositoryInterface at all of my call sites, but I want RepositoryActual to be created. Do I need to use a @Provides method, or can I do this with an @Inject annotation? (basically trying to see if I can spare myself having to create a @Module)

Is it possible to provide a variable with hilt like an accesstoken? I receive it after logging in in the app, so basically I would provide an object with hilt and change the properties? But is that working?

For anyone using hilt, our app has a really big graph at the moment (a ton of modules). We’re considering using hilt in our libraries first, and would need to get objects from our existing component into the SingletonComponent. I tried creating a bridge module which would pull from our singleton components’ holder to get the objects. However, it seems when i switch from the dagger to the hilt compiler, it’s not generating my existing components. If i have both, i get an error that it can’t find some MemoizedSentinal internal class. Has anyone even tried this before? We’re just not ready for a big bang yet on our singleton component.

Anyone doing hilt android tests with compose? I am following official guide, but I am having trouble implementing it. More specifically, current I am having an issue with objects that are annotated with

@ViewModelScope

or are installed in

@ViewModelComponent

.

Let's say I'm starting a new application and I have a

CrashReporterService

interface, and a real impl called

FirebaseCrashReporterService

. Both the interface and impl are on the Dependency graph, and so... nothing prevents someone from Injecting FirebaseCrashReporterService. Is there anything I can do to hide my real impls so that people only use the interface?

In an attempt to hide concrete classes you don't want your team to accidentally use. Which option would you go for? Interface and concrete:

interface CrashReporterService {
  fun logFatal(e: Exception)
}

class FirebaseCrashReporterService : CrashReporterService {
  override fun logFatal(e: Exception) {
    // do something
  }
}

Option 1️⃣ :(dont add the concrete to nav graph and just create it at the Provider)

@Module
object FirebaseCrashReporterModule {
    
    @JvmStatic
    @Provides
    fun firebaseCrashReporter(dependencies..) : CrashReporter {
        return FirebaseCrashReporter(...)
    }
}

Option 2️⃣: (use a qualifier to make the type "harder" to accidentally use)

@Module
@InstallIn(SingletonComponent::class)
abstract class AppInterfaceModule {
  @Singleton
  @Binds
  abstract fun bindsCrashReporterService(
      @Named("placeholder_qualifier") service: FirebaseCrashReporterService
  ): CrashReporterService
}

@Module
@InstallIn(SingletonComponent::class)
class AppImplModule {
  @Singleton
  @Provides
  @Named("placeholder_qualifier")
  fun bindsCrashReporterService(): FirebaseCrashReporterService {
    return FirebaseCrashReporterService()
  }
}

Is it possible to have fragment scoped custom providers for viewmodels? Here is what I currently have to do: • I create my custom object

@Module
@InstallIn(FragmentComponent::class)
object FragmentModule {
    @Provides
    @FragmentScoped
    fun provideMyObject(fragment: Fragment): MyObject {
        return fragment.getMyObject() // I can only get this from a fragment
    }
}

• I create my ViewModel without

@HiltViewModel

but with

@Inject constructor

• In my fragment I inject it with assisted inject

@Inject
lateinit var provider: Provider<MyViewModel>

private val viewModel: MyViewModel by assistedViewModel { provider.get() }

Since I know I'm only going to be using this ViewModel in a fragment, it would be nice to be able to get items from a fragment.

They're trivially expect/actual'd to work in MPP

Hello everyone, I got an issue with injecting something into a data class:

data class Example @Inject constructor(
    val x: X,
    val string: String? = x.method()
)

In my dagger class I have:

@Provides
@Singleton
fun x() = X()

but whenever I want to instantiate an

Example

object. it asks me for

x

dependency which should always be injected. Is there any approach of how I can deal with this?

Let’s say I have a view showing a list of contacts and a second view showing the detail of a contact. I have used

@ViewModelScoped

for the second view ViewModel which works fine when I navigate the first time to a contact detail view, but on every following navigation, the view shows the details of the previous contact before loading and showing the new details. Should I implement a “reset” mechanism that clears the content of the view model when navigating to a new contact, or should I use a different scope? I considered to not use any scope but then screen orientation changes would make the view model trigger the load again. What do you advice me to do ?

Can someone explain to me this part from Hilt Documentation (https://developer.android.com/training/dependency-injection/hilt-android#component-default): "Each Hilt component comes with a set of default bindings that Hilt can inject as dependencies into your own custom bindings. Note that these bindings correspond to the general activity and fragment types and not to any specific subclass. This is because Hilt uses a single activity component definition to inject all activities. Each activity has a different instance of this component."

does

hiltViewModel()

supports

@Assisted

constructor attributes now? Or does one still need to use a factory with

@AssistedFactory

?

Hi. Is there possible to inject two different components into a same Activity?

Why doesn't Hilt provide a

@WorkComponent

for WorkManager workers? Is there a way to make my own? Or is it intended, and there's something different to do for workers?