我和Kotlin一起使用Dagger 2 . 一切正常,但是当我尝试将SharedPreferences注入Activity时,我的项目甚至都没有创建 . Gradle控制台说:
di \ AppComponent.java:6:错误:[dagger.android.AndroidInjector.inject(T)] android.content.SharedPreferences不可为空,但由@ org.jetbrains.annotations.Nullable @ android.support提供 . 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注入e:myapp.mvp.StartScreen.StartActivity.sharedPref e:myapp.mvp.StartScreen.StartActivity注入e:dagger.android.AndroidInjector.inject(arg0)e:java.lang.IllegalStateException:无法分析:org .jetbrains.kotlin.kapt3.diagnostic.KaptError:注释处理时出错
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
}
}
应用程序:
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
}
活动:
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
}