Dagger不會為Android生成Dagger類

Question

我正在嘗試與Dagger建立一個項目。 現在，當我構建時，沒有為組件生成任何Dagger *類，並且出現以下錯誤：

Error:(10, 8) error: [com.redditapp.dagger.RedditAppGraph.inject(com.redditapp.RedditApplication)]
com.redditapp.ui.ActivityHierarchyServer cannot be provided without an @Provides- or @Produces-annotated method.
com.redditapp.ui.ActivityHierarchyServer is injected at
com.redditapp.RedditApplication.activityHierarchyServer
com.redditapp.RedditApplication is injected at
com.redditapp.dagger.RedditAppGraph.inject(app)

和

Error:(13, 10) error: com.redditapp.base.navigation.activity.ActivityScreenSwitcher cannot be provided without an @Inject constructor or from an @Provides-annotated method.
com.redditapp.base.navigation.activity.ActivityScreenSwitcher is injected at
com.redditapp.ui.screens.home.HomePresenter.<init>(screenSwitcher)
com.redditapp.ui.screens.home.HomePresenter is injected at
com.redditapp.ui.screens.home.HomeActivity.presenter
com.redditapp.ui.screens.home.HomeActivity is injected at
com.redditapp.ui.screens.home.HomeComponent.inject(activity)

這是我當前的設置。

應用程序級別的類使用：

public void buildComponentAndInject() {
        component = RedditAppComponent.Initializer.init(this);
        component.inject(this);
    }

RedditAppComponent看起來像這樣，並且DaggerRedditAppComponent未生成，因此是紅色的：

@ApplicationScope
@Component(modules = { RedditAppModule.class, UiModule.class})
public interface RedditAppComponent extends RedditAppGraph {
    /**
     * An initializer that creates the graph from an application.
     */
    final class Initializer {
        public static RedditAppComponent init(RedditApplication app) {
            return DaggerRedditAppComponent.builder()
                    .redditAppModule(new RedditAppModule(app))
                    .uiModule(new UiModule())
                    .build();
        }
        private Initializer() {} // No instances.
    }
}

使用父類RedditAppGraph：

public interface RedditAppGraph {
    void inject(RedditApplication app);
    ViewContainer viewContainer();
    ActivityHierarchyServer activityHierarchyServer();
}

包含引發錯誤的提供程序方法的UI模塊如下所示：

@Module
public class UiModule {

    @Provides
    @ApplicationScope
    ActivityScreenSwitcher provideActivityScreenSwitcher() {
        return new ActivityScreenSwitcher();
    }

    @Provides
    @ApplicationScope
    @ActivityScreenSwitcherServer
    ActivityHierarchyServer provideActivityHierarchyServer(final ActivityScreenSwitcher screenSwitcher) {
        return new ActivityHierarchyServer.Empty() {
            @Override
            public void onActivityStarted(Activity activity) {
                screenSwitcher.attach(activity);
            }

            @Override
            public void onActivityStopped(Activity activity) {
                screenSwitcher.detach();
            }
        };
    }
}

我試過重建項目，看它是否會生成類。

Answer 1

看來ActivityScreenSwitcherServer是一個限定詞。 在這種情況下，您要將ActivityHierarchyServer與限定符綁定在一起，但不使用它就將ActivityHierarchyServer暴露在組件上（通過RedditAppGraph ）。 從@Provides方法中刪除限定符或將其添加到組件接口。