如何使用DataBinding从Activity访问片段视图？

android {
    ...
    dataBinding {
        enabled = true
    }
}

<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable
            name="fragment"
            type="com.example.FragmentViewModel" />
    </data>
    ...
</layout>

public class FragmentViewModel {
    // 定义需要访问的视图的变量
    ...
}

public class MyFragment extends Fragment {
    private FragmentViewModel viewModel;
    private FragmentBinding binding;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // 使用DataBindingUtil绑定布局文件
        binding = DataBindingUtil.inflate(inflater, R.layout.fragment_layout, container, false);
        viewModel = new FragmentViewModel();
        binding.setFragment(viewModel);

        // 通过binding对象访问片段视图
        View view = binding.getRoot();
        ...

        return view;
    }
}