Question

我正在尝试在Android中使用Dagger 2。实施非常简单。以下是与匕首2相关的Component和Module s：

ApplicationComponent.kt

@Singleton
@Component(modules = arrayOf(AppModule::class))
interface ApplicationComponent {
    fun inject(app: Application)
    fun inject(mainActivity: MainActivity)
    fun plusMainAcitvityComponent(mainActivityModule: MainActivityModule): MainActivityComponent
}

MainActivityComponent.kt

@Subcomponent(modules = arrayOf(MainActivityModule::class, GoogleApiClientModule::class))
interface MainActivityComponent{

    fun inject(mainActivity: MainActivity)

}

AppModule.kt

@Module
class AppModule(val app: Application){

    @ApplicationContext
    @Provides
    fun providesApplicationContext() = app

}

GoogleApiClientModule.kt

@Module
class GoogleApiClientModule{

    companion object {
        val TAG = "GoogleApiClientModule"
    }

    @Singleton
    @Provides
    fun providesGoogleApiClient(@ActivityContext activity: MainActivity, connectionFailedListener: OnConnectionFailedListener) =
            GoogleApiClient.Builder(activity)
                    .addApi(Places.GEO_DATA_API)
                    .addApi(Places.PLACE_DETECTION_API)
                    .enableAutoManage(activity, connectionFailedListener)
                    .build()

    @Singleton
    @Provides
    fun providesConnectionFailedListener() = OnConnectionFailedListener {
        Log.d(TAG, "GAC connection has failed")
    }

}

GooglePlacesClientModule.kt

@Module
class GooglePlacesClientModule {

    @Provides
    fun providesGeoDataClient(@ActivityContext activity: MainActivity) = Places.getGeoDataClient(activity, null)

}

MainActivityModule.kt

@Module
class MainActivityModule(val activity: MainActivity){

    @ActivityContext
    @Provides
    fun providesActivityContext() = activity


}

以下是我的主要活动，我正在注入上述组件：

 class MainActivity : AppCompatActivity(), OnMapReadyCallback {

    lateinit var binding: ActivityMainBinding
    lateinit var mapFragment: SupportMapFragment
    @Inject lateinit var app: App
    @Inject lateinit var mainViewModelFactory: MainViewModelFactory
    lateinit var mainViewModel: MainViewModel


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        //Data binding
        binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
        //Dagger inject
        App.appComponent.inject(this)
        app.plustMainAcitvityComponent(this)?.inject(this)
        //Viewmodel init
        mainViewModel = ViewModelProviders.of(this, mainViewModelFactory).get(MainViewModel::class.java)
        //Ui init
        setSupportActionBar(binding.toolbarLayout?.toolbar)
        setupBottomSheetLayout()
        setupGoogleMap()
    }
      ----
     ---
   }

下面是我的App，其中Dagger已初始化：

class App: Application(){

    var mainActivityComponent: MainActivityComponent? = null

    companion object {
        lateinit var appComponent: ApplicationComponent
    }

    override fun onCreate() {
        super.onCreate()
        setupDagger()
    }

    fun setupDagger(){
        appComponent = DaggerApplicationComponent.builder().appModule(AppModule(this)).build()
    }


    fun plustMainAcitvityComponent(activity: MainActivity) : MainActivityComponent?{
        if(mainActivityComponent == null) {
            mainActivityComponent = appComponent.plusMainAcitvityComponent(MainActivityModule(activity))
        }
        return mainActivityComponent
    }

    fun clearMainActivityComponent(){
        mainActivityComponent = null
    }

}

当我运行应用程序时，我收到内部编译器错误。以下是我的IDE日志：

2017-11-29 11：54：39,953 [J pool 2/4] WARN - hes.resolve.KotlinCacheService - 找不到正确的模块信息。原因：分析类型类com.android.tools.idea.databinding.LightGeneratedComponentClass的元素，不包含文件文本：空值 2017-11-29 11：54：39,953 [J pool 2/4] WARN - .resolve.jvm.JvmAnalyzerFacade - Java从LibraryInfo引用null（libraryName = com.android.databinding：library-1.3.1）引用的类是：JavaClassImpl：DATA绑定组件类

注意：MainActivityComponent是ApplicationComponent的SubComponent。尽管ApplicationComponent目前只有一个模块，但将来会添加更多模块

Answer 1

我现在无法理解错误消息。我可以看到有两件事可以让它在这里出错 1）要将子组件添加到父组件，请将子组件类添加到父组件安装的@Module的子组件属性中。然后可以从父

中请求子组件的构建器

@Module(subcomponents = XYZ.class) class AppModule(val app: Application){

2）此外，您为子组件和组件提供相同的范围，除非分辨率没有歧义，否则不允许这样做。请阅读此处的文档 https://google.github.io/dagger/subcomponents.html

Answer 2

您的错误与Dagger无关，但与Android的数据绑定库无关。你在用它吗？如果没有，请将其从依赖项中删除，然后重试？

Android：使用Dagger 2时的内部编译器错误（Kotlin）

2 个答案: