kotlin中的Dagger2编译问题

Question

我正在尝试使用Dagger2学习依赖注入。我已经创建了很少的自定义范围和限定符。我已经创建了一个应用程序组件，我想在其中注入某些全局依赖项，我还创建了一个活动组件，它将基于活动上下文返回某些实例。

现在，当我试图在活动中注入全局实例时，我得到了如下错误：

@Qualifier
@Retention(AnnotationRetention.RUNTIME)
annotation class ActivityContext

@javax.inject.Qualifier
@Retention(AnnotationRetention.RUNTIME)
annotation class ApplicationContext

@Scope
@Retention(AnnotationRetention.SOURCE)
annotation class ApplicationScope

ApplicationScope.kt

@Scope
@Retention(AnnotationRetention.SOURCE)
annotation class ApplicationScope

在注入活动类中使用的ActivityComponent.kt。

@ActivityScope
@Component(modules = arrayOf(ActivityModule::class), dependencies = arrayOf(FirebaseComponent::class))
interface ActivityComponent {
    fun inject(mainActivity: MainActivity)
}

用于注入应用程序类的FireBaseComponent.kt。

@ApplicationScope
@Component(modules = arrayOf(ApplicationModule::class, FirebaseAuthModule::class, NetworkModule::class))
interface FirebaseComponent {
    fun inject(app: FirebaseChatApp)
}

ActivityModule.kt

@Module
class ActivityModule(val activity : Activity) {
    var mActivityRef : WeakReference<Activity> ;
    init {
        mActivityRef = WeakReference<Activity>(activity)
    }

    @Provides
    @ActivityScope
    @ActivityContext
    public fun getActivityContext() : Context? = mActivityRef.get()

    @Provides
    @ActivityScope
    @ActivityContext
    public fun getActivityInstance() : Activity? = mActivityRef.get();


    @Provides
    @ActivityScope
    public fun getGlideActivityInstance(@ActivityContext context : Context?) : Glide {
        Log.i("activityModule", "Returning activity glide")
        return Glide.get(context);
    }

}

ApplicationModule.kt

@Module
class ApplicationModule(val app : FirebaseChatApp) {

    @ApplicationContext
    @ApplicationScope
    @Provides
    fun provideContext() : Context = app


    @ApplicationInstance
    @ApplicationScope
    @Provides
    fun provideApplication() : Application = app
}

@Module
class FirebaseAuthModule {

    @Provides
    @ApplicationScope
    public fun getFirebaseAuth() : FirebaseAuth = FirebaseAuth.getInstance()
}

NetworkModule.kt

@Module
class NetworkModule {

    @Provides
    @ApplicationScope
    public fun getGlideApplicationInstance(@ApplicationContext applicationContext: Context ) : Glide {
        return Glide.get(applicationContext);
    }
}

FirebaseChatapp.kt应用程序类

class FirebaseChatApp : Application() {

        val firebaseComponent: FirebaseComponent by lazy {
            DaggerFirebaseComponent
                    .builder()
                    .applicationModule(ApplicationModule(this))
                    .build()
        }

    @Inject
    lateinit var firebaseAuth : FirebaseAuth

    @Inject
    lateinit var glide : Glide


    override fun onCreate() {
        super.onCreate()
        firebaseComponent.inject(this)
        Log.i("application", "APP->Firebase Auth = " + firebaseAuth)
        Log.i("application", "APP->Glide = " + glide)
    }

    public fun getApplicationComponent() : FirebaseComponent = firebaseComponent;
}

所有活动的baseActivity.kt超级类

public abstract class BaseActivity : AppCompatActivity(){
    @Inject
    @ActivityScope
    protected lateinit var glide : Glide

    @Inject
    @ApplicationScope
    protected lateinit var firebaseAuth : FirebaseAuth //ERROR HERE

    protected val activityComponent: ActivityComponent by lazy {
        DaggerActivityComponent
                .builder()
                .activityModule(ActivityModule(this))
                .firebaseComponent((this.application as FirebaseChatApp).getApplicationComponent())
                .build()
    }


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        injectComponent(activityComponent)
    }
     abstract fun injectComponent(activityComponent: ActivityComponent)
}

class MainActivity : BaseActivity() {


    override fun injectComponent(activityComponent: ActivityComponent) {
        activityComponent.inject(this)
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_main)
    }
}

我应该做些什么来解决这个错误。以及DI的正确使用方式是什么。因为我是新手。我有点困惑。

Answer 1

问题是，您试图使用组件依赖项，但您跳过了添加子作用域组件可以继承的规定方法。

@ApplicationScope
@Component(modules = arrayOf(ApplicationModule::class, FirebaseAuthModule::class, NetworkModule::class))
interface FirebaseComponent {
    fun firebaseAuth() : FirebaseAuth // <-- this is missing

    fun inject(app: FirebaseChatApp)
}