Unable to get ViewModelProvider.Factory for each ViewModel

[prdp89]

Hi,

I am following same app structure for my app as:

ActivityBuilder.java:
`@Module
public abstract class ActivityBuilder {

@ContributesAndroidInjector(modules = SplashActivityModule.class)
abstract SplashActivity bindSplashActivity();

@ContributesAndroidInjector(modules = {NavigationActivityModule.class,
                                       CatalogueFragmentProvider.class })
abstract NavigationActivity bindNavigationActivity();

}`

NavigationActivityModule.Java (NavigationActivity which draws Navigation View with NavigationViewModel):
`@Module
public class NavigationActivityModule {

@Provides
NavigationViewModel provideNavigationViewModel(Application application) {
    return new NavigationViewModel(application);
}

@provides
ViewModelProvider.Factory mainViewModelProvider(NavigationViewModel navigationViewModel) {
return new TraderViewModelFactory<>(navigationViewModel);
}
}`

CatalogueFragmentProvider.Java (CatalogueFragment which shows as the first fragment inside NavigationView container):
@module
public abstract class CatalogueFragmentProvider {
@ContributesAndroidInjector(modules = CataloguesFragmentModule.class)
abstract CataloguesFragment provideCataloguesFragment();
}

Lastly, CataloguesFragmentModule.Java (contain catalogue view such as RecyclerView inside CatalogueFragment):
@module
public class CataloguesFragmentModule {

@Provides
CatalogueFragmentViewModel provideAboutViewModel(CataloguesRepository cataloguesRepository, Application application) {
    return new CatalogueFragmentViewModel(cataloguesRepository, application);
}

@Provides
ViewModelProvider.Factory catalogueViewModelProvider(CatalogueFragmentViewModel catalogueFragmentViewModel) {
    return new TraderViewModelFactory<>(catalogueFragmentViewModel);
}

}

The problem is I am getting the same instance of NavigationViewModel inside the CatalogueViewModel. This throws error by ViewModelFactory since modelClass.isAssignableFrom returns false.

Please help. I stuck into this from last three days and couldn't find any solution by googling too.

Thanks.

[sunil91]

@provides
@singleton
AppDatabase provideAppDatabase(@databaseinfo String dbName, Context context) {
return Room.databaseBuilder(context, AppDatabase.class, dbName).fallbackToDestructiveMigration()
.build();
}

Appdatabase class wrong argument exception
@amitshekhariitbhu