java - kotlin + dagger 2:任务':app:kaptDebugKotlin'的执行失败

因此，我正在尝试创建一个示例，从Kotlin的GithubBrowserSample中获得启发。我已经成功迁移到kotlin代码，但是我的ApplicationComponent.kt错误。

Error:(12, 2) error: [dagger.android.AndroidInjector.inject(T)] java.util.Map<java.lang.Class<? extends android.support.v4.app.Fragment>,javax.inject.Provider<dagger.android.AndroidInjector.Factory<? extends android.support.v4.app.Fragment>>> cannot be provided without an @Provides-annotated method.
public abstract interface ApplicationComponent {
                ^
      java.util.Map<java.lang.Class<? extends android.support.v4.app.Fragment>,javax.inject.Provider<dagger.android.AndroidInjector.Factory<? extends android.support.v4.app.Fragment>>> is injected at
          dagger.android.DispatchingAndroidInjector.<init>(injectorFactories)
      dagger.android.DispatchingAndroidInjector<android.support.v4.app.Fragment> is injected at
          com.chintansoni.android.architecturecomponentsblueprint.base.BaseActivity.dispatchingAndroidInjector
      com.chintansoni.android.architecturecomponentsblueprint.view.activity.SplashActivity is injected at
          dagger.android.AndroidInjector.inject(arg0)

我可以看到import dagger.android.AndroidInjectionModule的AndroidInjectionModule出现了这个问题

让我分享我的代码片段。

KotlinApplication.kt

class KotlinApplication : Application(), HasActivityInjector {

    @Inject
    lateinit var dispatchingAndroidInjector: DispatchingAndroidInjector<Activity>

    override fun onCreate() {
        super.onCreate()
        initializeLogger()
        initializeAppInjector()
    }

    private fun initializeAppInjector() {
        AppInjector.init(this)
    }

    private fun initializeLogger() {
        if (BuildConfig.DEBUG) {
            Timber.plant(Timber.DebugTree())
        }
    }

    override fun activityInjector(): DispatchingAndroidInjector<Activity>? {
        return dispatchingAndroidInjector
    }
}

AppInjector.kt

object AppInjector {
    fun init(kotlinApplication: KotlinApplication) {
        DaggerApplicationComponent.builder()
                .application(kotlinApplication)
                .build()
                .inject(kotlinApplication)

        kotlinApplication.registerActivityLifecycleCallbacks(object : Application.ActivityLifecycleCallbacks {

            override fun onActivityCreated(activity: Activity, savedInstanceState: Bundle?) {
                handleActivity(activity)
            }

            override fun onActivityStarted(activity: Activity) {

            }

            override fun onActivityResumed(activity: Activity) {

            }

            override fun onActivityPaused(activity: Activity) {

            }

            override fun onActivityStopped(activity: Activity) {

            }

            override fun onActivitySaveInstanceState(activity: Activity, outState: Bundle) {

            }

            override fun onActivityDestroyed(activity: Activity) {

            }
        })
    }

    private fun handleActivity(activity: Activity) {
        if (activity is HasSupportFragmentInjector) {
            AndroidInjection.inject(activity)
        }
        (activity as? FragmentActivity)?.supportFragmentManager?.registerFragmentLifecycleCallbacks(
                object : FragmentManager.FragmentLifecycleCallbacks() {
                    override fun onFragmentCreated(fm: FragmentManager, f: Fragment,
                                                   savedInstanceState: Bundle) {
                        if (f is Injectable) {
                            AndroidSupportInjection.inject(f)
                        }
                    }
                }, true)
    }
}

ApplicationComponent.kt

@Singleton
@Component(modules = [(AndroidInjectionModule::class), (AppModule::class), (SplashActivityModule::class)])
interface ApplicationComponent {

    @Component.Builder
    interface Builder {

        @BindsInstance
        fun application(application: Application): Builder

        fun build(): ApplicationComponent
    }

    fun inject(kotlinApplication: KotlinApplication)
}

SplashActivityModule.kt

@Module
abstract class SplashActivityModule {
    @ContributesAndroidInjector(modules = [(FragmentBuildersModule::class)])
    internal abstract fun contributeSplashActivity(): SplashActivity
}

BaseActivity.kt

abstract class BaseActivity : AppCompatActivity(), HasSupportFragmentInjector {

    @Inject
    lateinit var dispatchingAndroidInjector: DispatchingAndroidInjector<Fragment>

    override fun supportFragmentInjector(): DispatchingAndroidInjector<Fragment> {
        return dispatchingAndroidInjector
    }

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

    abstract fun getLayoutResource(): Int
}

我的SplashActivity扩展了BaseActivity。

最佳答案

如果使用支持库中的Fragment，则必须在HasSupportFragmentInjector中使用KotlinApplication：

class KotlinApplication : Application(), HasActivityInjector, HasSupportFragmentInjector {

    @Inject
    lateinit var dispatchingAndroidInjector: DispatchingAndroidInjector<Activity>

    @Inject
    lateinit var dispatchingFragmentInjector: DispatchingAndroidInjector<Fragment>

    override fun onCreate() {
        super.onCreate()
        initializeLogger()
        initializeAppInjector()
    }

    private fun initializeAppInjector() {
        AppInjector.init(this)
    }

    private fun initializeLogger() {
        if (BuildConfig.DEBUG) {
            Timber.plant(Timber.DebugTree())
        }
    }

    override fun activityInjector(): DispatchingAndroidInjector<Activity>? {
        return dispatchingAndroidInjector
    }

    override fun supportFragmentInjector(): AndroidInjector<Fragment>? {
        return dispatchingFragmentInjector
    }
}

您还必须在AndroidSupportInjectionModule中安装AndroidInjectionModule而不是ApplicationComponent：

@Singleton
@Component(modules = [(AndroidSupportInjectionModule::class), (AppModule::class), (SplashActivityModule::class)])
interface ApplicationComponent {

    @Component.Builder
    interface Builder {

        @BindsInstance
        fun application(application: Application): Builder

        fun build(): ApplicationComponent
    }

    fun inject(kotlinApplication: KotlinApplication)
}