Question

我想抢先获取要加载到webView的网页的HTML代码，使用正则表达式解析它，并只显示我想要的HTML代码，同时让网页仍然认为它装了一切。

有没有办法在WebViewClient.onLoadResource()或类似的方法中做到这一点？

编辑：我试过这个：

class MyJavaScriptInterface  
 {  
      @SuppressWarnings("unused")  
         public void showHTML(String html, Context context)  
         {  
            new AlertDialog.Builder(context)  
                 .setTitle("HTML")  
                 .setMessage(html)  
                 .setPositiveButton(android.R.string.ok, null)  
             .setCancelable(false)  
             .create();  
               pageHTML = html;
         }  
 }

@Override
    public void customizeWebView(final ServiceCommunicableActivity activity, final WebView webview, final SearchResult mRom) {
        mRom.setFileSize(getFileSize(mRom.getURLSuffix()));
        webview.getSettings().setJavaScriptEnabled(true);
        MyJavaScriptInterface interfaceA = new MyJavaScriptInterface();
        webview.addJavascriptInterface(interfaceA, "HTMLOUT");  
        WebViewClient anchorWebViewClient = new WebViewClient()
        {
            @Override  
            public void onPageFinished(WebView view, String url)  
            {  
                /* This call inject JavaScript into the page which just finished loading. */  
                webview.loadUrl("javascript:window.HTMLOUT.showHTML('<head>'+document.getElementsByTagName('html')[0].innerHTML+'</head>');");
                Pattern pattern = Pattern.compile("<h2>Winning Sc.+</h2></div>(.+)<br>", Pattern.DOTALL);
                Matcher matcher = pattern.matcher(pageHTML);
                matcher.find();

永远不会调用接口

Answer 1

必须使用HttpClient。不需要cookie，只需解析html：

private String getDownloadButtonOnly(String url){
    HttpGet pageGet = new HttpGet(url);

    ResponseHandler<String> handler = new ResponseHandler<String>() {
        public String handleResponse(HttpResponse response) throws ClientProtocolException, IOException {
            HttpEntity entity = response.getEntity();
            String html; 

            if (entity != null) {
                html = EntityUtils.toString(entity);
                return html;
            } else {
                return null;
            }
        }
    };

    pageHTML = null;
    try {
        while (pageHTML==null){
            pageHTML = client.execute(pageGet, handler);
        }
    } catch (ClientProtocolException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

        Pattern pattern = Pattern.compile("<h2>Direct Down.+?</h2>(</div>)*(.+?)<.+?>", Pattern.DOTALL);
        Matcher matcher = pattern.matcher(pageHTML);
        String displayHTML = null;
        while(matcher.find()){
            displayHTML = matcher.group();
        }

    return displayHTML;
}

    @Override
    public void customizeWebView(final ServiceCommunicableActivity activity, final WebView webview, final SearchResult mRom) {
        mRom.setFileSize(getFileSize(mRom.getURLSuffix()));
        webview.getSettings().setJavaScriptEnabled(true);
        WebViewClient anchorWebViewClient = new WebViewClient()
        {

            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                super.onPageStarted(view, url, favicon);
                String downloadButtonHTML = getDownloadButtonOnly(url);
                if(downloadButtonHTML!=null && !url.equals(lastLoadedURL)){
                    lastLoadedURL = url;
                    webview.loadDataWithBaseURL(url, downloadButtonHTML, null, "utf-8", url);
                }
            }

Answer 2

以下是Extracting HTML from a WebView的教程，请不要忘记阅读本教程末尾的警告。

Answer 3

尝试先添加@JavascriptInterface public void showHTML（String html，Context context）

Answer 4

如果您有机会影响从中接收页面的服务器部分，您可以要求在出现错误时重定向到特定页面。在WebViewClient中，您可以检测到此重定向并使用错误信号。

是否可以从WebView获取HTML代码

4 个答案: