Android 中具有干净架构的 mvvm 和不具有干净架构的 mvvm 有什么区别

Android中具有干净架构的MVVM和不具有干净架构的MVVM的区别

java
// 数据层
public interface UserRepository {
    User getUserById(int id);
    void saveUser(User user);
}
public class UserRepositoryImpl implements UserRepository {
    // 实现数据层的接口方法
}
// 仓库层
public class UserRepositoryImpl implements UserRepository {
    private UserDataSource dataSource;
    public UserRepositoryImpl(UserDataSource dataSource) {
        this.dataSource = dataSource;
    }
    public User getUserById(int id) {
        return dataSource.getUserById(id);
    }
    public void saveUser(User user) {
        dataSource.saveUser(user);
    }
}
// 领域层
public class GetUserByIdUseCase {
    private UserRepository userRepository;
    public GetUserByIdUseCase(UserRepository userRepository) {
        this.userRepository = userRepository;
    }
    public User execute(int id) {
        return userRepository.getUserById(id);
    }
}
// 视图模型层
public class UserViewModel extends ViewModel {
    private GetUserByIdUseCase getUserByIdUseCase;
    public UserViewModel(GetUserByIdUseCase getUserByIdUseCase) {
        this.getUserByIdUseCase = getUserByIdUseCase;
    }
    public LiveData getUserById(int id) {
        MutableLiveData userLiveData = new MutableLiveData<>();
        userLiveData.setValue(getUserByIdUseCase.execute(id));
        return userLiveData;
    }
}
// 视图层
public class UserActivity extends AppCompatActivity {
    private UserViewModel userViewModel;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_user);
        userViewModel = new ViewModelProvider(this).get(UserViewModel.class);
        int userId = getIntent().getIntExtra("userId", 0);
        LiveData userLiveData = userViewModel.getUserById(userId);
        userLiveData.observe(this, user -> {
            // 更新UI显示
        });
    }
}