Getting cannot be provided without an @Inject constructor or from an @Provides- or @Produces-annotated method. on kotlin dagger2

Question

error: app.sareing.core.sharedPrefs.StringPreference cannot be provided without an @Inject constructor or from an @Provides- or @Produces-annotated method.
public abstract void inject(@org.jetbrains.annotations.NotNull()
                     ^
  app.sareing.core.sharedPrefs.StringPreference is injected at
      app.sareing.activity.MainActivity.authToken
  app.sareing.activity.MainActivity is injected at
      app.sareing.injection.component.ActivityComponent.inject(activity)

Tried Named fields, still no luck solving this.

Show your module and app.sareing.core.sharedPrefs.StringPreference classes. — jczerski, Jan 15 '19 at 20:17

Khoa Tran · Answer 1 · 2019-01-16T10:41:51.097

In Dagger, you have two way to provide an object

Using @Inject in the construction

Example:

UserRepository @Inject constructor(private val mContext: Context)

But how can we @Inject constructor with some class of the third party like Retrofit Service Interface? That why Dagger has @Provide

Example:

@Module class AppModule { @Provides fun provideContext(application: Application): Context = application.applicationContext }

Dagger also has some other way to provide an object

You can read more here

In your case, you can provide your StringPreference class in your app module like AppModule

@Module class AppModule { @Provides fun provideStringPreference(context: Context): StringPreference = StringPreference(context) }

score 0 · Accepted Answer · answered Jan 16 '19 at 18:06

0

Fixed by solution here https://stackoverflow.com/a/48057282/9821453

I was not using @fields:qualifier_name while injecting.

Thanks

answered Jan 16 '19 at 18:06

Anurag Chutani

591
1
4
15

Getting cannot be provided without an @Inject constructor or from an @Provides- or @Produces-annotated method. on kotlin dagger2

2 Answers2