Dagger2 Qualifier无法与Kotlin一起使用? [英] Dagger2 Qualifier not working with Kotlin?

问题描述

我有一个简单的课，如下所示

I have a simple class as below

class MainString(val msg: String)

我想注入不同的参数，所以我按照 https://google.github.io/dagger/users-guide

I want to inject with different argument to it, so I use the @Named Qualifier as per the guide shown in https://google.github.io/dagger/users-guide

我的AppModule具有

With that my AppModule has

@Provides @Named("Two")
fun provideTwoMainString(): MainString {
    return MainString("Two")
}

@Provides @Named("One")
fun provideOneMainString(): MainString {
    return MainString("One")
}

然后在我的MainActivity中，我打电话

And in my MainActivity, I just call

@Inject @Named("One")
lateinit var stringOne: MainString

@Inject @Named("Two")
lateinit var stringTwo: MainString

但是，当我编译时，它会抱怨

However, when I compile, it complains

Error:(11, 1) error: com.elyeproj.demo_dagger_scope.MainString cannot be provided without an @Inject constructor or from an @Provides- or @Produces-annotated method.

似乎要我提供另一个没有限定符的提供者.因此，如果我添加以下内容，则所有内容都会编译.但这对我来说并不习惯，因为我想进行不同的论点注入.

It seems to want me to provide another Provider without the qualifier. So if I add the below, all will compiles. But it is not of used to me, as I want to have different argument injection.

@Provides
fun provideMainString(): MainString {
    return MainString("Solo")
}

我做错了什么?

推荐答案

注释在kotlin上的工作略有不同.看起来此文档

Annotation work slightly different on kotlin. look this doc

您必须将字段注释为:

@Inject @field:Named("Two")
lateinit var stringOne: MainString

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