Load random URL if webview is refreshed

RandomWebview.java

package com.anta40.webviewtest;

import androidx.appcompat.app.AppCompatActivity;
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;

import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import java.util.Random;

public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener {

    private WebView webView;
    private SwipeRefreshLayout swipeRefreshLayout;

    private String[] randomUrls;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        randomUrls = new String[]{"https://www.codepolitan.com","https://www.detik.com",
                "https://www.apple.com", "https://en.wikipedia.org/wiki/Main_Page"};

        swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swiperefresh);
        swipeRefreshLayout.setOnRefreshListener(this);

        webView = (WebView) findViewById(R.id.webview);
        webView.setWebViewClient(new CustomWebViewClient());
        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webView.loadUrl(randomUrls[getRandomIndex(0,4)]);
    }

    @Override
    public void onRefresh() {
        String url = randomUrls[getRandomIndex(0, 3)];
        webView.loadUrl(url);
    }

    public int getRandomIndex(int min, int max) {
        Random random = new Random();
        return random.nextInt(max - min) + min;
    }

    private class CustomWebViewClient extends WebViewClient {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);
            return true;
        }

        @Override
        public void onPageFinished(WebView view, String url) {
            swipeRefreshLayout.setRefreshing(false);
        }
    }
}