我试图遵循google()的示例。我看到它可以绑定到不同的ViewModel类型到通用类型。如何使用Dagger2绑定到具有多个ViewModelFactory的地图
@Module
abstract class ViewModelModule {
@Binds
@IntoMap
@ViewModelKey(UserViewModel.class)
abstract ViewModel bindUserViewModel(UserViewModel userViewModel);
@Binds
@IntoMap
@ViewModelKey(SearchViewModel.class)
abstract ViewModel bindSearchViewModel(SearchViewModel searchViewModel);
@Binds
@IntoMap
@ViewModelKey(RepoViewModel.class)
abstract ViewModel bindRepoViewModel(RepoViewModel repoViewModel);
@Binds
abstract ViewModelProvider.Factory bindViewModelFactory(GithubViewModelFactory factory);
}
我想要做的就是多ViewModelProvider.Factory绑定到通用之一。
@Module
abstract class ViewModelModule {
@Binds
@IntoMap
@ViewModelFactoryKey(FeedEntryListViewModelFactory.class)
abstract ViewModelProvider.Factory bindViewModelFactory(FeedEntryListViewModelFactory factory);
}
ViewModelFactoryKey.java
@Documented
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@MapKey
@interface ViewModelFactoryKey {
Class<? extends ViewModelProvider.Factory > value();
}
FeedActivity.java
public class FeedActivity extends DaggerAppCompatActivity {
@Inject
ViewModelProvider.Factory viewModelFactory;
FeedEntryListViewModel viewModel;
@SuppressLint("StaticFieldLeak")
@Override
protected void onCreate(Bundle savedInstanceState) {
...
}
}
然而,它引发以下错误。
Error:(21, 8) error: [dagger.android.AndroidInjector.inject(T)] android.arch.lifecycle.ViewModelProvider.Factory cannot be provided without an @Provides- or @Produces-annotated method.
android.arch.lifecycle.ViewModelProvider.Factory is injected at
com.cn29.aac.ui.feedentry.FeedActivity.viewModelFactory
com.cn29.aac.ui.feedentry.FeedActivity is injected at
dagger.android.AndroidInjector.inject(arg0)
我是Dagger2的新手。如果使用不当,请随时发表评论。谢谢。
'我想要做的就是多ViewModelProvider.Factory绑定到通用one' - 这是什么意思?你有各种工厂,你想把它们放到地图上? – azizbekian
是的,我想要它。其实我有多个类FeedListViewModelFactory,FeedDetailViewModelFactory ...但在这些活动中,注入类型是ViewModelProvider.Factory。因此,我需要将两者都映射到ViewModelProvider.Factory。 –