Verbose android Injection fails with missing binding

[matejdro]

When doing android injection the verbose way (without ContributesAndroidInjection), dagger-reflect fails with Missing binding for java.util.Map<java.lang.String, javax.inject.Provider<dagger.android.AndroidInjector$Factory<?>>>.

Sample code:

@Singleton
@Component(
    modules = [
        AndroidInjectionModule::class,
        AppModule::class
    ]
)
interface AppComponent {
    fun inject(app: MyApp)
}

@Module(
    subcomponents = [MainActivitySubcomponent::class]
)
interface AppModule {
    @Binds
    @IntoMap
    @ClassKey(MainActivity::class)
    fun bindMainActivityInjectorFactory(
        factory: MainActivitySubcomponent.Factory
    ): AndroidInjector.Factory<*>
}

@Subcomponent
interface MainActivitySubcomponent : AndroidInjector<MainActivity> {
    @Subcomponent.Factory
    interface Factory : AndroidInjector.Factory<MainActivity>
}


class MyApp : Application(), HasAndroidInjector {
    @Inject
    lateinit var androidInjector: DispatchingAndroidInjector<Any>

    override fun onCreate() {
        Dagger
            .create(AppComponent::class.java)
            .inject(this)

        super.onCreate()
    }

    override fun androidInjector(): AndroidInjector<Any> = androidInjector
}

class MainActivity : Activity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        AndroidInjection.inject(this)
        super.onCreate(savedInstanceState)
    }
}

Reproduced with:

    implementation 'com.google.dagger:dagger-android:2.24'

    // Reproduced on Sun Aug 11 03:26:53 UTC snapshot
    implementation 'com.jakewharton.dagger:dagger-reflect:0.2.0-SNAPSHOT'

Running this with normal annotation processing dagger works fine.

[matejdro]

I think the issue is that dagger-inject ignores @Multibinds annotation in dagger.android.AndroidInjectionModule

Workaround for the issue is to manually inject empty map:

    @Provides
    @JvmStatic
    fun provideEmptyStringMap()
            : Map<@JvmSuppressWildcards String, @JvmSuppressWildcards Provider<AndroidInjector.Factory<*>>> =
        emptyMap()