Dagger2 Qualifier not working with Kotlin?

Question

I have a simple class as below

class MainString(val msg: String)

I want to inject with different argument to it, so I use the @Named<

Answer 1

Annotation work slightly different on kotlin. look this doc

You have to annotate the field as:

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

Answer 2

1) If you are using a qualifier like following, here 'OmdbService'

@Qualifier
public annotation class OmdbService

Then use

@Inject  @field:OmdbService lateinit var retrofitOmdbService: Retrofit

2) If are using a named provider like following, here 'orangeservice_retrofit'

@Provides
    @OrangeApplicationScope
    @Named("orangeservice_retrofit")
    fun retrofit(okHttpClient :OkHttpClient, gson : Gson, c :Context): Retrofit {
        return Retrofit.Builder()
                .addConverterFactory(GsonConverterFactory.create(gson))
                .client(okHttpClient)
                .baseUrl(c.getString(R.string.base_url))
                .build()
}

Then use

@Inject @field:Named("orangeservice_retrofit") lateinit var retrofitOrangeService: Retrofit

Answer 3

If you add the following to your qualifier annotation:

@Target(FIELD, VALUE_PARAMETER, FUNCTION, PROPERTY_GETTER, PROPERTY_SETTER)

then you won't have to add "field:"

For example, with:

  @Qualifier
  @Retention(RUNTIME)
  @Target(FIELD, VALUE_PARAMETER, FUNCTION, PROPERTY_GETTER, PROPERTY_SETTER)
  annotation class One

you can inject as follows:

  @Inject @One lateinit var stringOne: String

Unfortunately @Named doesn't specify the @Target(..), so just create your own annotations. @Named is a bad idea anyway, since it's using string literals.