I'm having some weird kotlin generic issues with Dagger that I kinda fixed but the solution isn't sound.
Here's the dagger classes:
@Module class P5Module { @Provides fun pool(): RecyclerView.RecycledViewPool = RecyclerView.RecycledViewPool() @Provides fun adapters(fusion: P5FusionAdapter, personas: P5ListAdapter, skills: P5SkillsAdapter, info: InfoAdapter) : List = listOf(fusion, personas, skills, info) } @ActivityScope @Subcomponent(modules = arrayOf(P5Module::class)) interface P5Component { fun adapter(): PageableAdapter } interface Pageable { fun manager(ctx: Context): LayoutManager fun attach() fun adapter(): Adapter } class PageableAdapter @Inject constructor(val pageables: List, val pool: RecyclerView.RecycledViewPool) :PagerAdapter() When I build, I get this kapt error in the top level component:
e: C:\Users\daykm\StudioProjects\P5Executioner\app\build\tmp\kapt3\stubs\appDebug\com\daykm\p5executioner\AppComponent.java:17: error: [com.daykm.p5executioner.main.P5Component.adapter()] java.util.List extends com.daykm.p5executioner.view.Pageable> cannot be provided without an @Provides-annotated method. e: e: public abstract interface AppComponent { e: ^ e: java.util.List extends com.daykm.p5executioner.view.Pageable> is injected at e: com.daykm.p5executioner.view.PageableAdapter.(pageables, …) e: com.daykm.p5executioner.view.PageableAdapter is provided at e: com.daykm.p5executioner.main.P5Component.adapter() e: java.lang.IllegalStateException: failed to analyze: org.jetbrains.kotlin.kapt3.diagnostic.KaptError: Error while annotation processing I took a look at the stubs generated:
@javax.inject.Inject() public PageableAdapter(@org.jetbrains.annotations.NotNull() java.util.List extends com.daykm.p5executioner.view.Pageable> pageables, @org.jetbrains.annotations.NotNull() android.support.v7.widget.RecyclerView.RecycledViewPool pool) { super(); } @org.jetbrains.annotations.NotNull() @dagger.Provides() public final java.util.List adapters(@org.jetbrains.annotations.NotNull() Apparently doesn't match with because when I modify the dagger class like so:
@Module class P5Module { @Provides fun pool(): RecyclerView.RecycledViewPool = RecyclerView.RecycledViewPool() @Provides fun adapters(fusion: P5FusionAdapter, personas: P5ListAdapter, skills: P5SkillsAdapter, info: InfoAdapter) : List = listOf(fusion, personas, skills, info) } @ActivityScope @Subcomponent(modules = arrayOf(P5Module::class)) interface P5Component { fun adapter(): PageableAdapter } interface Pageable { fun manager(ctx: Context): LayoutManager fun attach() fun adapter(): Adapter } class PageableAdapter @Inject constructor(val pageables: List, val pool: RecyclerView.RecycledViewPool) :PagerAdapter() The issue disappears. Am I bumping into some weird translation issue with covariance and contravariance? I'd rather not force a cast downstream.