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android-mvvm-with-dagger-2
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@Singleton | |
public class ViewModelFactory implements ViewModelProvider.Factory { | |
private final Map<Class<? extends ViewModel>, Provider<ViewModel>> creators; | |
@Inject | |
public ViewModelFactory(Map<Class<? extends ViewModel>, Provider<ViewModel>> creators) { | |
this.creators = creators; | |
} | |
@NonNull | |
@SuppressWarnings("unchecked") | |
@Override | |
public <T extends ViewModel> T create(@NonNull 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 model class " + modelClass); | |
} | |
try { | |
return (T) creator.get(); | |
} catch (Exception e) { | |
throw new RuntimeException(e); | |
} | |
} | |
} |
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