如何在android webview上获取"iframe“内容？

WebView webView = findViewById(R.id.webView);
webView.setWebViewClient(new WebViewClient() {
    @Override
    public WebResourceResponse shouldInterceptRequest(WebView view, String url) {
        if (url.contains("iframe")) {
            try {
                URL iframeUrl = new URL(url);
                HttpURLConnection connection = (HttpURLConnection) iframeUrl.openConnection();
                InputStream inputStream = connection.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
                StringBuilder content = new StringBuilder();
                String line;
                while ((line = reader.readLine()) != null) {
                    content.append(line);
                }
                reader.close();
                inputStream.close();
                // 在这里可以对获取到的"iframe"内容进行处理
                // ...
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return super.shouldInterceptRequest(view, url);
    }
});

webView.loadUrl("https://example.com");