CustomScope 不能引用不同范围的绑定

Question

我是 dagger 的新手，我已经这样定义了我的应用程序组件

@Singleton
@Component(modules = {ApplicationModule.class})
public interface ApplicationComponent {
    void inject(BaseActivity activity);
    Context context();
}

这是我的应用程序模块

@Module
public class ApplicationModule {

    public TipoApplication application;

    public ApplicationModule(TipoApplication application) {
        this.application = application;
    }

    @Singleton
    @Provides
    public Context provideContext(){return application.getApplicationContext();}

    @Singleton
    @Provides
    public SharedPreferences provideSharedPreferences(Context context){
        return PreferenceManager.getDefaultSharedPreferences(context);
    }

    @Singleton
    @Provides
    public Gson provideGson(){
        return new Gson();
    }

    @Singleton
    @Provides
    public SharedPrefsManager provideSharedPrefsManager(SharedPreferences sharedPreferences, Gson gson){
        return new SharedPrefsManager(sharedPreferences, gson);
    }
}

我已经创建了一个依赖组件 LocationProviderComponent

@LocationScope
@Component(dependencies = {ApplicationComponent.class},modules = {LocationProviderModule.class})
public interface LocationProviderComponent {
    void inject(LocationRepository locationRepository);
}

最后是我的 LocationProviderModule

@Module
public class LocationProviderModule {

    @Singleton
    @Provides
    FusedLocationProviderClient provideFusedLocationProviderClient(Context context) {
        return LocationServices.getFusedLocationProviderClient(context);

    }

    @Singleton
    @Provides
    LocationRequest provideLocationRequest() {
        return new LocationRequest()
                .setInterval(5000)
                .setFastestInterval(60000)
                .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    }

    @Singleton
    @Provides
    LocationSettingsRequest provideLocationSettingRequest(LocationRequest mLocationRequest) {
        return new LocationSettingsRequest.Builder().addLocationRequest(mLocationRequest).build();
    }

}

我在构建时遇到 2 个错误。

第一个找不到符号 class DaggerApplicationComponent 第二

LocationProviderComponent scoped with LocationScope may not reference bindings with different scopes:
@Singleton @Provides FusedLocationProviderClient LocationProviderModule.provideFusedLocationProviderClient(android.content.Context)
@Singleton @Provides LocationRequest .module.LocationProviderModule.provideLocationRequest()

请告诉我哪里做错了。

Answer 1

任何模块的 @Provides 方法只能与它们所属的组件具有相同的作用域。阅读更多 here.

在你的例子中，LocationProviderModule 是 LocationProviderComponent 的一部分，它的范围是 @LocationScope，而该模块中的提供方法使用 @Singleton 范围。这正是 Dagger 所抱怨的：

LocationProviderComponent scoped with LocationScope may not reference bindings with different scopes

也指出了问题所在：

@Singleton @Provides FusedLocationProviderClient LocationProviderModule.provideFusedLocationProviderClient(android.content.Context)
@Singleton @Provides LocationRequest.module.LocationProviderModule.provideLocationRequest()

而不是使用 @Singleton，您只需要在 LocationProviderModule.

中使用 @LocationScope