webview android studio

package com.example.tunisietourisme;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

import android.view.KeyEvent;

import android.webkit.WebChromeClient;

import android.webkit.WebSettings;

import android.webkit.WebView;

import android.webkit.WebViewClient;

public class Main5Activity extends AppCompatActivity {

    private WebView webView = null;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main5);

        this.webView = (WebView) findViewById(R.id.webview);

        WebSettings webSettings = webView.getSettings();

        webSettings.setJavaScriptEnabled(true);

        WebViewClientImpl webViewClient = new WebViewClientImpl(this);

        webView.setWebViewClient(webViewClient);

        webView.loadUrl("https://www.booking.com/city/tn/bizerte.ar.html");

    }

    @Override

    public boolean onKeyDown(int keyCode, KeyEvent event) {

        if ((keyCode == KeyEvent.KEYCODE_BACK) && this.webView.canGoBack()) {

            this.webView.goBack();

            return true;

        }

        return super.onKeyDown(keyCode, event);

    }

}