Question

我有一个带有一些参数的演示者。

public WidgetPresenterImpl(WidgetSettingInteractor stateInteractor,
                           WidgetStatisticInteractor statisticApiInteractor,
                           WidgetStatisticInteractor statisticCacheInteractor,
                           Context context) {
    mStateInteractor = stateInteractor;
    mStatisticApiInteractor = statisticApiInteractor;
    mStatisticCacheInteractor = statisticCacheInteractor;
    mContext = context;
}

演示者的初始化看起来像这样

WidgetPresenter presenter = new WidgetPresenterImpl(
                new WidgetSettingInteractorImpl(new WidgetRepositoryImpl()),
                new WidgetStatisticInteractorImpl(new WidgetStatisticApiRepositoryImpl()),
                new WidgetStatisticInteractorImpl(new WidgetStatisticCacheRepositoryImpl()),
                context);

我想用匕首进行初始化。为此，我写了一个模块

@Module
public abstract class WidgetModule {

@Binds
abstract WidgetPresenter widgetPresenter(WidgetPresenterImpl presenter);

@Binds
abstract WidgetSettingInteractor widgetSettingInteractor(WidgetSettingInteractorImpl settingInteractor);

@Binds
abstract WidgetStatisticInteractor widgetStatisticInteractor(WidgetStatisticInteractorImpl statisticInteractor);

@Binds
abstract WidgetStatisticRepository widgetStatisticApiRepository(WidgetStatisticApiRepositoryImpl apiRepository);

@Binds
abstract WidgetStatisticRepository widgetStatisticCacheRepository(WidgetStatisticCacheRepositoryImpl cacheRepository);

@Binds
abstract WidgetRepository widgetSettingRepository(WidgetRepositoryImpl widgetRepository);

}

但项目不会，错误

error: [dagger.android.AndroidInjector.inject(T)] ....WidgetStatisticRepository is bound multiple times:
@Binds ....WidgetStatisticRepository ....widgetStatisticApiRepository(....WidgetStatisticApiRepositoryImpl)
@Binds ....WidgetStatisticRepository ....widgetStatisticCacheRepository(....WidgetStatisticCacheRepositoryImpl)

Answer 1

根据评论似乎不需要这样做，但考虑到后续问题，您可能会对此有所帮助。这可能是这样的：

@Named("Api")
@Binds
abstract WidgetStatisticRepository 
widgetStatisticApiRepository(WidgetStatisticApiRepositoryImpl apiRepository);

@Named("Cache")
@Binds
abstract WidgetStatisticRepository 
widgetStatisticCacheRepository(WidgetStatisticCacheRepositoryImpl cacheRepository);

然后你可以简单地在WidgetPresenterImpl的构造函数中添加@Inject注释（假设你有一个@Provides方法返回一个Context）：

@Inject
public WidgetPresenterImpl(WidgetSettingInteractor stateInteractor,
                       @Named("Api") WidgetStatisticInteractor statisticApiInteractor,
                       @Named("Cache") WidgetStatisticInteractor statisticCacheInteractor,
                       Context context) {
    mStateInteractor = stateInteractor;
    mStatisticApiInteractor = statisticApiInteractor;
    mStatisticCacheInteractor = statisticCacheInteractor;
    mContext = context;
}

或者假设您想要抽象WidgetPresenter接口的实现，您可以在非抽象模块中创建相应的@Provides方法：

@Module
class WidgetPresenterModule {

        @Provides
        public WidgetPresenter provideWidgetPresenter(WidgetSettingInteractor stateInteractor,
                       @Named("Api") WidgetStatisticInteractor statisticApiInteractor,
                       @Named("Cache") WidgetStatisticInteractor statisticCacheInteractor,
                       Context context) {
            return new WidgetPresenterImpl(stateInteractor, statisticApiInteractor, statisticCacheInteractor, context);
    }
}

如何注入相同类型的对象

1 个答案: