在带有数据绑定的片段布局中使用Activity ViewModel

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

import androidx.lifecycle.ViewModel;

public class MyViewModel extends ViewModel {
    // 在这里定义与片段相关的数据和逻辑
}

<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable
            name="viewModel"
            type="com.example.MyViewModel" />
    </data>
    
    <!-- 在这里定义片段的布局 -->
    
</layout>

import androidx.databinding.DataBindingUtil;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.example.databinding.FragmentMyBinding;

public class MyFragment extends Fragment {
    private MyViewModel viewModel;
    private FragmentMyBinding binding;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        binding = DataBindingUtil.inflate(inflater, R.layout.fragment_my, container, false);
        viewModel = ViewModelProviders.of(getActivity()).get(MyViewModel.class);
        binding.setViewModel(viewModel);
        binding.setLifecycleOwner(this);
        return binding.getRoot();
    }
}