In my code lin 57 switch(keycode), has a problem that IT cannot resolve symbol 'keycode' I dont kown what to do ?

package com.example.momskart.ui.gallery;

import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProvider;

import com.example.momskart.R;
import com.example.momskart.databinding.FragmentGalleryBinding;

public class GalleryFragment extends Fragment {

    private GalleryViewModel galleryViewModel;
    private FragmentGalleryBinding binding;

    public View onCreateView(@NonNull LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {
        galleryViewModel =
                new ViewModelProvider(this).get(GalleryViewModel.class);

        binding = FragmentGalleryBinding.inflate(inflater, container, false);
        View root = binding.getRoot();

        final WebView specialWebView = binding.idWebViewSpecail;
        final ProgressBar loadingPB =binding.idPBLoading;
        specialWebView.loadUrl("https://themomskart.com/categorypage/Homemade-Biscuits-&-Cookies%3Fcat_id%3D11%3Fsup_cat_id%3D18&marketplace%3DMOMSKART");
        specialWebView.setWebViewClient(new WebViewClient(){
            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                super.onPageStarted(view, url, favicon);
                loadingPB.setVisibility(View.VISIBLE);
            }

            @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);
                loadingPB.setVisibility(View.GONE);
            }
        });

        specialWebView.setOnKeyListener(new View.OnKeyListener() {
            @Override
            public boolean onKey(View view, int i, KeyEvent keyEvent) {
                if (keyEvent.getAction()==KeyEvent.ACTION_DOWN){
                    switch (keyCode){
                        case KeyEvent.KEYCODE_BACK:
                            if(specialWebView.canGoBack()){
                                specialWebView.canGoBack();
                            }

                    }

                }
                return false;
            }
        });
        return root;
    }

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