I'm using Dagger 2 with Kotlin. All works fine, but when I'm trying to Inject SharedPreferences to Activity my project doen't even creating. Gradle Console says:
di\\AppComponent.java:6: error: [dagger.android.AndroidInjector.inject(T)] android.content.SharedPreferences is not nullable, but is being provided by @org.jetbrains.annotations.Nullable @android.support.annotation.Nullable @Singleton @Provides android.content.SharedPreferences myapp.di.Modules.SharedPrefModule.providePreferences(android.content.Context) e:
e: public abstract interface AppComponent { e: ^ e:
at: android.content.SharedPreferences is injected at e:
myapp.mvp.StartScreen.StartActivity.sharedPref e:
myapp.mvp.StartScreen.StartActivity is injected at e:
dagger.android.AndroidInjector.inject(arg0) e: java.lang.IllegalStateException: failed to analyze: org.jetbrains.kotlin.kapt3.diagnostic.KaptError: Error while annotation processing
SharedPreferencesModule:
@Module
class SharedPrefModule{
@Provides
@Singleton
fun providePreferences (context : Context): SharedPreferences? {
return context.getSharedPreferences(SHARED_PREFERENCES_SETTINGS, Context.MODE_PRIVATE)
}
}
AppComponent:
@Singleton
@Component(modules=arrayOf(AppModule::class, AndroidSupportInjectionModule::class,
SharedPrefModule::class, ActivityBuilder::class))
interface AppComponent {
fun inject (app:App)
@Component.Builder
interface Builder {
@BindsInstance
fun application(context: Application): Builder
fun build(): AppComponent
}
}
App:
class App : Application(),HasActivityInjector {
@Inject
lateinit var activityInjector : DispatchingAndroidInjector<Activity>
override fun onCreate() {
super.onCreate()
DaggerAppComponent.builder().build().inject(this)
}
override fun activityInjector(): AndroidInjector<Activity> = activityInjector
}
Activity:
class StartActivity: AppCompatActivity(), HasActivityInjector {
@Inject
lateinit var activityInjector : DispatchingAndroidInjector<Activity>
@Inject
lateinit var sharedPref : SharedPreferences
override fun onCreate(savedInstanceState: Bundle?) {
AndroidInjection.inject(this)
super.onCreate(savedInstanceState)
setContentView(R.layout.start_activity_layout)
// var data = sharedPref.getString(SHARED_PREFERENCES_SETTINGS, "")
// Log.d("tag", "data - $data")
}
override fun activityInjector(): AndroidInjector<Activity> = activityInjector
}
SharedPrefModule使用上下文来创建SharedPreferences实例,并且由于您不包括提供上下文的任何模块,因此Dagger可能无法创建SharedPreferences实例。
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