Dagger 2 ViewModelProvider.Factory多次绑定

Question

我正在尝试使用片段创建应用程序.我创建了一个测试片段(HomeFragment),它只有一个简单的TextView.我创建了所有必需的类(模块,模型和提供者).但我得到一个奇怪的并发症错误

Error:(25, 10) error: [dagger.android.AndroidInjector.inject(T)] android.arch.lifecycle.ViewModelProvider.Factory is bound multiple times:
@Provides android.arch.lifecycle.ViewModelProvider.Factory app.series.com.series3go.ui.main.MainActivityModule.mainViewModelProvider(app.series.com.series3go.ui.main.MainViewModel)
@Provides android.arch.lifecycle.ViewModelProvider.Factory app.series.com.series3go.ui.home.HomeFragmentModule.provideHomeFragmentViewModel(app.series.com.series3go.ui.home.HomeFragmentViewModel)

HomeFragment

public class HomeFragment extends BaseFragment<HomeFragmentBinding, HomeFragmentViewModel> {

public static final String TAG = HomeFragment.class.getSimpleName();
@Inject
ViewModelProvider.Factory mViewModelFactory;


HomeFragmentBinding mHomeFragmentBinding;
private HomeFragmentViewModel mHomeFragmentViewModel;

public static HomeFragment newInstance() {
    Bundle args = new Bundle();
    HomeFragment fragment = new HomeFragment();
    fragment.setArguments(args);
    return fragment;
}

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

@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    mHomeFragmentBinding = getViewDataBinding();
    setUp();
    subscribeToLiveData();
}

@Override
public HomeFragmentViewModel getViewModel() {
    mHomeFragmentViewModel = ViewModelProviders.of(this, mViewModelFactory).get(HomeFragmentViewModel.class);
    return mHomeFragmentViewModel;
}

@Override
public int getBindingVariable() {
    return BR.viewModel;
}

@Override
public int getLayoutId() {
    return R.layout.home_fragment;
}

private void setUp() {

}

private void subscribeToLiveData() {

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


}

HomeFragmentModule

@Module
public class HomeFragmentModule
{

    @Provides
    HomeFragmentViewModel homeFragmentViewModel()
    {
        return new HomeFragmentViewModel();
    }

    @Provides
    ViewModelProvider.Factory provideHomeFragmentViewModel(HomeFragmentViewModel homeFragmentViewModel)
    {
        return new ViewModelProviderFactory<>(homeFragmentViewModel);
    }

}

HomeFragmentProvider

@Module
public abstract class HomeFragmentProvider {

    @ContributesAndroidInjector(modules = HomeFragmentModule.class)
    abstract HomeFragment provideHomeFragmentFactory();

} 

HomeFragmentViewModel

public class HomeFragmentViewModel扩展BaseViewModel {

private final ObservableField<String> appVersion = new ObservableField<>();

public HomeFragmentViewModel() {
    super();
    appVersion.set("123");
}

public ObservableField<String> getAppVersion() {
    return appVersion;
}

}

home_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context="app.series.com.series3go.ui.main.MainActivity">

    <data>

        <import type="android.view.View" />

        <variable
            name="viewModel"
            type="app.series.com.series3go.ui.home.HomeFragmentViewModel" />

    </data>


    <TextView
        android:id="@+id/tvAppVersion"
        style="@style/TextStyle.Title.Sub"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:padding="5dp"
        android:text="@{viewModel.appVersion}" />

</layout>

在提供程序类(HomeFragmentProvider)中是否存在关于函数名称的命名约定,我没有看到在项目中的任何位置使用这些函数.它们是否用在生成的匕首类中？

谢谢

UPDATE

AppComponent

@Singleton
@Component(modules = {AndroidSupportInjectionModule.class, AppModule.class, ActivityBuilder.class})
public interface AppComponent {

    @Component.Builder
    interface Builder {

        @BindsInstance
        Builder application(Application application);

        AppComponent build();

    }

    void inject(SeriesApp app);

}

Answer 1

看起来您的依赖关系图中提供了两种方法 ViewModelProvider.Factory.

要解决这种歧义,请使用@Named注释.

@Module
public class HomeFragmentModule {
    @Provides
    @Named("HomeFragment")
    ViewModelProvider.Factory provideHomeFragmentViewModel(HomeFragmentViewModel homeFragmentViewModel) {
        return new ViewModelProviderFactory<>(homeFragmentViewModel);
    }
    /* Rest of the code */
}

public class HomeFragment {
    @Inject
    @Named("HomeFragment")
    ViewModelProvider.Factory mViewModelFactory;
    /* Rest of the code */
}

你也应该对第二个做同样的ViewModelProvider.Factory事情(in MainActivity和它的模块).