安卓DataBinding内部片段

<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable
            name="viewModel"
            type="com.example.MainViewModel" />
    </data>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
        
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{viewModel.text}" />
        
        <fragment
            android:id="@+id/inner_fragment"
            android:name="com.example.InnerFragment"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </LinearLayout>
</layout>

public class MainActivity extends AppCompatActivity {
    private ActivityMainBinding binding;
    private MainViewModel viewModel;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
        viewModel = new ViewModelProvider(this).get(MainViewModel.class);
        binding.setViewModel(viewModel);
        binding.setLifecycleOwner(this);
    }
}

public class InnerFragment extends Fragment {
    private FragmentInnerBinding binding;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        binding = DataBindingUtil.inflate(inflater, R.layout.fragment_inner, container, false);
        return binding.getRoot();
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        // 设置数据绑定等操作
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        binding = null;
    }
}