1. Hi folks. Question: Do I need to define a custom

@Component

in order to use map multibinding with Hilt? (e.g. as in Dagger https://dagger.dev/dev-guide/multibindings) I have the below sample code. Of course it doesn’t work, fails with

Dagger/MissingBinding

, since there is no provider for

Map<String, MyInterface

. But I offer it just to illustrate the question.

@AndroidEntryPoint
class MainActivity : AppCompatActivity() {

  @Inject
  lateinit var implMap: Map<String, MyInterface>

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    Log.d("MainActivity", "implMap: $implMap")
  }
}

@Module
@InstallIn(ActivityComponent::class)
object MyModule {
  @Provides @IntoMap
  @StringKey("myimpl1")
  fun provideMyImpl1(): MyInterface {
    return MyImpl1("myArg")
  }
  @Provides @IntoMap
  @StringKey("myimpl2")
  fun provideMyImpl2(): MyInterface {
    return MyImpl2()
  }
}


interface MyInterface {
  fun myMethod()
}

class MyImpl1(private val myParam: String) : MyInterface {
  override fun myMethod() {}
}

class MyImpl2 : MyInterface {
  override fun myMethod() {}
}

@HiltAndroidApp
class MyApplication : Application()

Hi, you might need to add

@JvmSuppressWildcards

to your injected field

@Inject
lateinit var implMap: Map<String, @JvmSuppressWildcards MyInterface>

Oh you’re right! I totally forgot. Thanks @Rafal