重绘和回流（重绘和回流对性能的影响）

webView.setWebViewClient(new WebViewClient() {
    @Nullable
    @Override
    public WebResourceResponse shouldInterceptRequest(WebView view, WebResourceRequest request) {
        // 获取请求的URL
        String url = request.getUrl().toString();

        try {
            // 使用HttpURLConnection或者OkHttp来处理请求
            HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();

            // 记录开始时间
            long startTime = System.currentTimeMillis();

            // 连接并获取响应
            connection.connect();
            InputStream inputStream = connection.getInputStream();

            // 计算下载速度
            long endTime = System.currentTimeMillis();
            long duration = endTime - startTime;
            int contentLength = connection.getContentLength();
            double speed = (double) contentLength / duration;  // 这是字节/毫秒，可能需要转换为更合适的单位

            // 创建并返回WebResourceResponse
            return new WebResourceResponse(connection.getContentType(), connection.getContentEncoding(), inputStream);
        } catch (IOException e) {
            // 处理错误
            return null;
        }
    }
});

webView.setWebViewClient(new WebViewClient() {
    @Override
    public void onPageFinished(WebView view, String url) {
        // 页面加载完成后，注入JavaScript代码来获取性能数据
        view.evaluateJavascript(
            "(function() {" +
                "var performance = window.performance;" +
                "var timing = performance.timing;" +
                "var resources = performance.getEntriesByType('resource');" +
                "var data = {" +
                    "'timing': timing," +
                    "'resources': resources.map(function(resource) {" +
                        "return {" +
                            "'name': resource.name," +
                            "'type': resource.initiatorType," +
                            "'duration': resource.duration," +
                            "'responseEnd': resource.responseEnd" +
                        "};" +
                    "})" +
                "};" +
                "return JSON.stringify(data);" +
            "})()",
            new ValueCallback<String>() {
                @Override
                public void onReceiveValue(String value) {
                    // 在这里处理返回的JSON数据
                }
            });
    }
});

webView.setWebViewClient(new WebViewClient() {
    @Override
    public void onPageFinished(WebView view, String url) {
        // 页面加载完成后，注入vConsole的脚本
        injectScriptFile(view, "vconsole.min.js");
    }

    private void injectScriptFile(WebView view, String scriptFile) {
        InputStream input;
        try {
            input = getAssets().open(scriptFile);
            byte[] buffer = new byte[input.available()];
            input.read(buffer);
            input.close();

            // 字符串编码为UTF-8
            String encoded = Base64.encodeToString(buffer, Base64.NO_WRAP);
            view.evaluateJavascript("(function() {" +
                "var parent = document.getElementsByTagName('head').item(0);" +
                "var script = document.createElement('script');" +
                "script.type = 'text/javascript';" +
                "script.innerHTML = window.atob('" + encoded + "');" +
                "parent.appendChild(script)" +
                "})()", null);
        } catch (IOException e) {
            // 处理异常
        }
    }
});