webview backpress go back android java

package cugh.trade.bahanomongan;

import android.annotation.SuppressLint;
import android.app.ProgressDialog;
import android.os.Build;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;

import java.util.Objects;


public class BlogWebViewFragment extends Fragment {

    public SmartPreferences smartPreferences;
    public static final String TAG = BlogWebViewFragment.class.getSimpleName();
    public ProgressDialog loading;
    public WebView webView;
    @SuppressLint("SetJavaScriptEnabled")
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = View.inflate(getContext(), R.layout.fragment_blog, null);
        smartPreferences = new SmartPreferences(requireContext());
        loading = ProgressDialog.show(requireContext(),null,"Please wait...",false,true);
        webView = view.findViewById(R.id.webview);
        TextView tvError = view.findViewById(R.id.tv_error);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            if (NetworkState.isOnline(Objects.requireNonNull(getContext()))) {
                tvError.setVisibility(View.GONE);
                WebSettings webSettings = webView.getSettings();
                webSettings.setJavaScriptEnabled(true);
                webView.loadUrl(Constants.WEB_URL);
                webView.setWebChromeClient(new WebChromeClient());
                webView.setWebViewClient(new WebViewClient() {
                    @Override
                    public boolean shouldOverrideUrlLoading(WebView view, String url) {
                        view.loadUrl(url);

                        return true;
                    }
                    @Override
                    public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
                        // TODO: handle error in some way
                    }
                    @Override
                    public void onPageFinished(WebView view, String url) {
                        super.onPageFinished(view, url);
                        if (webView.getProgress() == 100) {
                            loading.dismiss();
                        }
                    }
                });

                webView.canGoBack();
                webView.setOnKeyListener(new View.OnKeyListener() {
                    public boolean onKey(View v, int keyCode, KeyEvent event) {
                        if (keyCode == KeyEvent.KEYCODE_BACK
                                && event.getAction() == MotionEvent.ACTION_UP
                                && webView.canGoBack()) {
                            webView.goBack();
                            return true;
                        }
                        return false;
                    }
                });

            } else {
                webView.setVisibility(View.GONE);
            }
        }

        return view;
    }
}