java android WebView进度对话框问题

// 布局文件中定义的WebView和ProgressBar
WebView webView = findViewById(R.id.webView);
ProgressBar progressBar = findViewById(R.id.progressBar);

// 创建ProgressDialog对象
ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.setTitle("正在加载网页");

// 设置WebViewClient
webView.setWebViewClient(new WebViewClient() {
    @Override
    public void onPageStarted(WebView view, String url, Bitmap favicon) {
        // 网页开始加载时显示进度对话框
        progressDialog.show();
    }

    @Override
    public void onPageFinished(WebView view, String url) {
        // 网页加载完成时隐藏进度对话框
        progressDialog.dismiss();
    }

    @Override
    public void onProgressChanged(WebView view, int newProgress) {
        // 更新进度对话框的进度
        progressDialog.setProgress(newProgress);
    }
});

// 加载网页
webView.loadUrl("https://www.example.com");