如何在每个片段中拥有单独的ViewModel实例，以及如何在视图模型之间共享数据

public class MyFragment extends Fragment {
    private MyViewModel mViewModel;

    public static MyFragment newInstance() {
        return new MyFragment();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_my, container, false);

        // 获取ViewModelProvider对象
        ViewModelProvider viewModelProvider = ViewModelProviders.of(this);

        // 获取片段的ViewModel实例
        mViewModel = viewModelProvider.get(MyViewModel.class);

        // 在这里可以使用mViewModel进行数据操作

        return view;
    }
}

public class SharedViewModel extends ViewModel {
    private MutableLiveData<String> mData = new MutableLiveData<>();

    public void setData(String data) {
        mData.setValue(data);
    }

    public LiveData<String> getData() {
        return mData;
    }
}

public class FragmentA extends Fragment {
    private SharedViewModel mViewModel;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_a, container, false);

        // 获取ViewModelProvider对象
        ViewModelProvider viewModelProvider = ViewModelProviders.of(getActivity());

        // 获取共享数据的ViewModel实例
        mViewModel = viewModelProvider.get(SharedViewModel.class);

        // 在这里可以使用mViewModel进行数据操作

        return view;
    }
}

public class FragmentB extends Fragment {
    private SharedViewModel mViewModel;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_b, container, false);

        // 获取ViewModelProvider对象
        ViewModelProvider viewModelProvider = ViewModelProviders.of(getActivity());

        // 获取共享数据的ViewModel实例
        mViewModel = viewModelProvider.get(SharedViewModel.class);

        // 在这里可以使用mViewModel进行数据操作

        return view;
    }
}