Dagger：IllegalArgumentException：没有为 Class 绑定的注入器工厂

Question

我是 Dagger 2 的新手。我有 2 个 Activity，我想为两者都使用注入的 ViewModel。这是我的 ViewModuleFactory :

@Singleton
public class ProductViewModelFactory implements ViewModelProvider.Factory {

    private final Map<Class<? extends ViewModel>, Provider<ViewModel>> creators;

    @Inject
    public ProductViewModelFactory(Map<Class<? extends ViewModel>, Provider<ViewModel>> creators) {
        this.creators = creators;
    }


    @SuppressWarnings("unchecked")
    @Override
    public <T extends ViewModel> T create(Class<T> modelClass) {
        Provider<? extends ViewModel> creator = creators.get(modelClass);
        if (creator == null) {
            for (Map.Entry<Class<? extends ViewModel>, Provider<ViewModel>> entry : creators.entrySet()) {
                if (modelClass.isAssignableFrom(entry.getKey())) {
                    creator = entry.getValue();
                    break;
                }
            }
        }
        if (creator == null) {
            throw new IllegalArgumentException("unknown viewmodel class " + modelClass);
        }
        try {
            return (T) creator.get();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}

我的 ViewModelModule:

@Module
abstract class ViewModelModule {
    @Binds
    @IntoMap
    @ViewModelKey(ProductListViewModel.class)
    abstract ViewModel bindProductListViewModel(ProductListViewModel listViewModel);

    @Binds
    @IntoMap
    @ViewModelKey(ProductDetailsViewModel.class)
    abstract ViewModel bindProductDetailsViewModel(ProductDetailsViewModel detailsViewModel);

    @Binds
    abstract ViewModelProvider.Factory bindViewModelFactory(ProductViewModelFactory factory);
}

我的 ViewModelKey 用于映射：

@Documented
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@MapKey
@interface ViewModelKey {
    Class<? extends ViewModel> value();
}

我的Activity模块：

@Module
public abstract class ActivityModule {
    abstract ProductListActivity contributeProductListActivity();
    abstract ProductDetailsActivity contributeProductDetailsActivity();
}

我的 AppModule:

@Module
class AppModule {

@Provides
    @Singleton
    RedMartProductService provideRedMartProductService() {
        ........
    }

    @Provides
    @Singleton
    ProductListRepository provideProductListRepository(ProductListRepository repository) {
        return repository;
    }

    @Provides
    @Singleton
    ProductDetailsRepository provideProductDetailsRepository(ProductDetailsRepository repository) {
        return repository;
    }
}

我的AppComponent:

@Singleton
@Component(modules = {AndroidInjectionModule.class, ActivityModule.class, AppModule.class})
public interface AppComponent {
    @Component.Builder
    interface Builder {
        @BindsInstance
        Builder application(Application application);

        AppComponent build();
    }

    void inject(MartApplication martApp);
}

我的申请:

public class MartApplication extends Application implements HasActivityInjector {

    @Inject
    DispatchingAndroidInjector<Activity> dispatchingAndroidInjector;

    @Override
    public void onCreate() {
        super.onCreate();
    }

    @Override
    public DispatchingAndroidInjector<Activity> activityInjector() {
        return dispatchingAndroidInjector;
    }
}

在Activity中：

@Inject
ViewModelProvider.Factory viewModelFactory;
.......
AndroidInjection.inject(activity); // Throwing exception
ListViewModel = ViewModelProviders.of(this, viewModelFactory).get(ProductListViewModel.class);

注入时抛出异常：

java.lang.IllegalArgumentException: No injector factory bound for Class<com.mymart.ui.ProductListActivity>

谁能帮我找出代码中的问题？

................................................ .....................

编辑：我按照@azizbekian 尝试使用 ContributesAndroidInjector，但在构建时导致以下错误：

    error: [dagger.android.AndroidInjector.inject(T)] Found a dependency cycle:
com.mymart.repository.ProductListRepository is injected at
com.mymart.di.AppModule.provideProductListRepository(repository)
com.mymart.repository.ProductListRepository is injected at
com.mymart.viewmodel.ProductListViewModel.<init>(productListRepository)
com.mymart.viewmodel.ProductListViewModel is injected at
com.mymart.di.ViewModelModule.bindProductListViewModel(listViewModel)
java.util.Map<java.lang.Class<? extends android.arch.lifecycle.ViewModel>,javax.inject.Provider<android.arch.lifecycle.ViewModel>> is injected at
com.mymart.viewmodel.ProductViewModelFactory.<init>(creators)
com.mymart.viewmodel.ProductViewModelFactory is injected at
com.mymart.di.ViewModelModule.bindViewModelFactory(factory)
android.arch.lifecycle.ViewModelProvider.Factory is injected at
com.mymart.ui.ProductListActivity.viewModelFactory
com.mymart.ui.ProductListActivity is injected at
dagger.android.AndroidInjector.inject(arg0)

编辑 2 所有更改后，我再次面临异常：

java.lang.RuntimeException: Unable to create application com.kaushik.myredmart.MartApplication: java.lang.IllegalStateException: com.kaushik.myredmart.di.AppModule must be set
                                                 at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4710)
                                                 at android.app.ActivityThread.-wrap1(ActivityThread.java)
                                                 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1405)
                                                 at android.os.Handler.dispatchMessage(Handler.java:102)
                                                 at android.os.Looper.loop(Looper.java:148)
                                                 at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                 at java.lang.reflect.Method.invoke(Native Method)
                                                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
                                              Caused by: java.lang.IllegalStateException: com.kaushik.myredmart.di.AppModule must be set
                                                 at com.kaushik.myredmart.di.DaggerAppComponent$Builder.build(DaggerAppComponent.java:180)
                                                 at com.kaushik.myredmart.di.AppInjector.init(AppInjector.java:30)
                                                 at com.kaushik.myredmart.MartApplication.onCreate(MartApplication.java:28)
                                                 at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1013)
                                                 at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4707)
                                                 at android.app.ActivityThread.-wrap1(ActivityThread.java) 
                                                 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1405) 
                                                 at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                 at android.os.Looper.loop(Looper.java:148) 
                                                 at android.app.ActivityThread.main(ActivityThread.java:5417) 
                                                 at java.lang.reflect.Method.invoke(Native Method)

Answer 1

我相信你忘记了 @ContributesAndroidInjector 注释：


    @Module
    public abstract class ActivityModule {
        @ContributesAndroidInjector
        abstract ProductListActivity contributeProductListActivity();
        @ContributesAndroidInjector
        abstract ProductDetailsActivity contributeProductDetailsActivity();
    }

并在 AppModule 中包含 ViewModelModule:


    @Module(includes = ViewModelModule.class)
    class AppModule {
        ...
    }

查看您编写的代码：

@Provides
@Singleton
ProductListRepository provideProductListRepository(ProductListRepository repository) {
    return repository;
}

你希望发生什么？你在告诉匕首"hey, dagger, whenever I ask you to provide me ProductListRepository then create(return) that object using ProductListRepository"。那是行不通的。

很可能您想要的是 "hey, dagger, whenever I ask you to provide me an implementation of ProductListRepository then create(return) that object using ProductListRepositoryImpl":

@Provides
@Singleton
ProductListRepository provideProductListRepository(ProductListRepositoryImpl repository) {
    return repository;
}

可以用以下内容代替：

@Binds
@Singleton
abstract ProductListRepository provideProductListRepository(ProductListRepositoryImpl repository);

Answer 2

使用@contrubutesAndroidInjector 需要额外的annotationProcessor。

将此行添加到您的 gradle 构建文件中：

annotationProcessor 'com.google.dagger:dagger-android-processor:2.11'

Answer 3

对于此错误：“Dagger：IllegalArgumentException：没有为 Class 绑定的注入器工厂”

如果您将导航组件与单个Activity一起使用，您会看到此错误。

What should you do?

Please check your @Module abstract class FragmentProvider { ... } because you need to add your Fragment inside of it as Contribute.

@Module
abstract class FragmentProvider {

  @ContributesAndroidInjector // <- Do not forget this line.
  abstract fun contributeYourNewFragment(): YourNewFragment
}

Answer 4

Dagger2 错误比 dagger1 更直接，但它会根据 dagger 在编译时首先遇到的问题逐一弹出。

您的解决方案不仅仅遇到了上述错误：

第一个错误：Dagger：IllegalArgumentException：没有为 Class

那是因为你在 ActivityModule 中为 dagger 提供了 activity 而没有添加注解 @ContributesAndroidInjector

此注释必须应用于 returns 具体 Android 框架类型的模块中的抽象方法。”即 Activity / 片段等

@Module
public abstract class ActivityModule {
    @ContributesAndroidInjector
    abstract ProductListActivity contributeProductListActivity();
    @ContributesAndroidInjector
    abstract ProductDetailsActivity contributeProductDetailsActivity();
}

Ref

第二个错误：java.lang.IllegalStateException：必须设置 AppModule 在 DaggerAppComponent$Builder.build(DaggerAppComponent.java:180)

如果您的 AppModule 没有任何默认构造函数，那么 Dagger 无法创建 AppModule 的实例。所以创建一个 AppModule 实例并将其设置为 Dagger graph。

 mComponent = DaggerXComponent.builder()
    .appModule(new AppModule(....)) // create appModule instance
    .build();

如果模块没有任何用户定义的构造函数，那么 Dagger 将在需要时通过默认构造函数自动创建一个实例。

找到这个

Dagger：IllegalArgumentException：没有为 Class 绑定的注入器工厂

Dagger: IllegalArgumentException: No injector factory bound for Class

android

dependency-injection

dagger

dagger-2