这个问题的解决方法是在Android和Wasm上手动配置ViewModel,而不是使用自动配置功能。
下面是一个示例代码,展示如何手动配置ViewModel:
在Android上:
ViewModelLocator
的类,继承自ViewModelProvider.AndroidViewModelFactory
。public class ViewModelLocator extends ViewModelProvider.AndroidViewModelFactory {
private Application mApplication;
public ViewModelLocator(@NonNull Application application) {
super(application);
mApplication = application;
}
@Override
public T create(@NonNull Class modelClass) {
if (modelClass.isAssignableFrom(MyViewModel.class)) {
return (T) new MyViewModel(mApplication);
}
throw new IllegalArgumentException("Unknown ViewModel class");
}
}
ViewModelProvider
来获取ViewModel,并将ViewModelLocator
传递给它。ViewModelLocator viewModelLocator = new ViewModelLocator(getApplication());
MyViewModel viewModel = new ViewModelProvider(this, viewModelLocator).get(MyViewModel.class);
在Wasm上:
ViewModelLocator
的类,实现Ioc.IContainer
接口。public class ViewModelLocator : Ioc.IContainer
{
public T Resolve() where T : class
{
if (typeof(T) == typeof(MyViewModel))
{
return new MyViewModel() as T;
}
throw new ArgumentException("Unknown ViewModel class");
}
}
ConfigureServices
方法中注册ViewModelLocator
。services.AddSingleton();
Ioc
服务来获取ViewModel实例。var viewModelLocator = HttpContext.RequestServices.GetService();
MyViewModel viewModel = viewModelLocator.Resolve();
通过手动配置ViewModel,您可以在Android和Wasm上实现相同的功能,并避免使用自动配置时的问题。