是否可以从 WebView 获取 HTML 代码
[英]Is it possible to get the HTML code from WebView
问题描述
I would like to preemptively get the HTML code of a webpage that is to be loaded in a webView , parse it using regex, and display only the HTML code that I want, while letting the webpage still think it has loaded everything.
我想抢先获取要在webView中加载的网页的 HTML 代码，使用正则表达式对其进行解析，并仅显示我想要的 HTML 代码，同时让网页仍然认为它已经加载了所有内容。
Is there any way to do that in the WebViewClient.onLoadResource() or similar methods?有没有办法在WebViewClient.onLoadResource()或类似方法中做到这一点？
EDIT: I tried this: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();
The interface is never called该接口永远不会被调用
4 个解决方案
解决方案1
10 已采纳 2010-08-14 04:44:18
Had to use HttpClient.不得不使用HttpClient。 no cookies required, just parsing for html: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);
}
}
解决方案2
5 2010-08-13 18:58:23
这是从 WebView 中提取 HTML的教程，不要忘记阅读教程末尾的警告。
解决方案3
0 2013-05-23 16:41:05
尝试在 public void showHTML(String html, Context context) 之前添加@JavascriptInterface
解决方案4
0 2014-09-04 10:29:23
In case you have a chance to influence server part where you receive a page from, you can ask to redirect to a particular page in case of error.如果您有机会影响接收页面的服务器部分，您可以要求重定向到特定页面以防出错。 In your WebViewClient you can detect this redirect and use it a signal of error.在您的 WebViewClient 中，您可以检测到此重定向并将其用作错误信号。
解决方案5
0 2022-07-17 11:09:44
are there any suggestions if this works with ajax loaded pages too?如果这也适用于ajax加载的页面，有什么建议吗？
my web- application loads the data via ajax after user login.我的网络应用程序在用户登录后通过 ajax 加载数据。
i want to get the content (parts of the html content) and pass eg a inner frame html to the printer or at least into an android textbox for further processing this content.我想获取内容（部分 html 内容）并将例如内部框架 html 传递到打印机或至少传递到 android 文本框以进一步处理此内容。 greetings hannes问候汉尼斯
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.