Dagger 2 @Provides can't be apply to static function in Kotlin?

Question

I have the following Java code which works fine

@Module(subcomponents = {MainActivityComponent.class})
abstract public class ActivityBuilder {

    @Provides
    @Singleton
    static Context provideContext(Application application) {
        return application;
    }

    @Binds
    @IntoMap
    @ClassKey(MainActivity.class)
    abstract AndroidInjector.Factory<?> bindMainActivity(MainActivityComponent.Builder builder);
}

When I convert it to Kotlin

@Module(subcomponents = [MainActivityComponent::class])
abstract class ActivityBuilder {
    companion object {
        @Provides
        @Singleton
        fun provideContext(application: Application): Context {
            return application
        }
    }

    @Binds
    @IntoMap
    @ClassKey(MainActivity::class)
    abstract fun bindMainActivity(builder: MainActivityComponent.Builder): AndroidInjector.Factory<*>

}

I got error stating I can't have my @Provides on the static function.

error: @Provides methods can only be present within a @Module or @ProducerModule
    public final android.content.Context provideContext(@org.jetbrains.annotations.NotNull()
                                         ^

How could I fix that?

https://stackoverflow.com/questions/44894218/dagger-2-static-provider-methods-in-kotlin — Elye, Jan 05 '19 at 09:01

score 5 · Accepted Answer · answered Jan 05 '19 at 08:58

5

Apparently the below works.

@Module(subcomponents = [MainActivityComponent::class])
abstract class ActivityBuilder {

    @Module
    companion object {
        @JvmStatic
        @Provides
        @Singleton
        fun provideContext(application: Application): Context {
            return application
        }
    }

    @Binds
    @IntoMap
    @ClassKey(MainActivity::class)
    abstract fun bindMainActivity(builder: MainActivityComponent.Builder): AndroidInjector.Factory<*>

}

answered Jan 05 '19 at 08:58

Elye

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You don't need @Module on the companion object – EpicPandaForce Jan 05 '19 at 09:03
1

Without @Module on the companion object that, the same error occurs – Elye Jan 05 '19 at 09:08
Hmm that is odd. I figured you need the `@JvmStatic` but not the `@Module` there – EpicPandaForce Jan 05 '19 at 09:50
with dagger version 2.26 you do NOT need @Module on the companion object – ebeninki Feb 09 '20 at 13:54

Dagger 2 @Provides can't be apply to static function in Kotlin?

1 Answers1