我如何从一个的WebView网页的内容? [英] How do I get the web page contents from a WebView?
问题描述
在Android上,我有一个的WebView
,其中显示的页面。
我如何获得页面的源代码,而无需再次请求页面?
这似乎的WebView
应该有某种的getPageSource()
方法返回一个字符串,但可惜它不是。
如果启用JavaScript,什么是适当的JavaScript来把这个调用来获取内容是什么?
webview.loadUrl(JavaScript的:(函数(){+
document.getElementsByTagName('身体')[0] .style.color ='红';+
})());
我知道这是一个迟到的答案,但我发现这个问题,因为我有同样的问题。我想我发现了这个帖子上lexandera.com。下面的code基本上是一个剪切和粘贴从站点。这似乎这样的伎俩。
最后语境对myApp =这一点;
/ *这个类的一个实例将被注册为一个JavaScript接口* /
类MyJavaScriptInterface
{
@JavascriptInterface
@燮pressWarnings(未使用)
公共无效processHTML(字符串HTML)
{
//处理的HTML根据需要由应用
}
}
最后的WebView浏览器=(web视图)findViewById(R.id.browser);
如果你想要的工作,显然/ *必须启用JavaScript * /
browser.getSettings()setJavaScriptEnabled(真)。
/ *注册名为HTMLOUT *一个新的JavaScript接口/
browser.addJavascriptInterface(新MyJavaScriptInterface(),HTMLOUT);
/ * WebViewClient必须设置在调用使用loadURL! * /
browser.setWebViewClient(新WebViewClient(){
@覆盖
公共无效onPageFinished(web视图查看,字符串URL)
{
/ *这个调用JavaScript插入刚刚完成加载页面。 * /
browser.loadUrl("javascript:window.HTMLOUT.processHTML('<head>'+document.getElementsByTagName('html')[0].innerHTML+'</head>');");
}
});
/ *加载网页* /
browser.loadUrl(http://lexandera.com/files/jsexamples/gethtml.html);
On Android, I have a WebView
that is displaying a page.
How do I get the page source without requesting the page again?
It seems WebView
should have some kind of getPageSource()
method that returns a string, but alas it does not.
If I enable JavaScript, what is the appropriate JavaScript to put in this call to get the contents?
webview.loadUrl("javascript:(function() { " +
"document.getElementsByTagName('body')[0].style.color = 'red'; " +
"})()");
I know this is a late answer, but I found this question because I had the same problem. I think I found the answer in this post on lexandera.com. The code below is basically a cut-and-paste from the site. It seems to do the trick.
final Context myApp = this;
/* An instance of this class will be registered as a JavaScript interface */
class MyJavaScriptInterface
{
@JavascriptInterface
@SuppressWarnings("unused")
public void processHTML(String html)
{
// process the html as needed by the app
}
}
final WebView browser = (WebView)findViewById(R.id.browser);
/* JavaScript must be enabled if you want it to work, obviously */
browser.getSettings().setJavaScriptEnabled(true);
/* Register a new JavaScript interface called HTMLOUT */
browser.addJavascriptInterface(new MyJavaScriptInterface(), "HTMLOUT");
/* WebViewClient must be set BEFORE calling loadUrl! */
browser.setWebViewClient(new WebViewClient() {
@Override
public void onPageFinished(WebView view, String url)
{
/* This call inject JavaScript into the page which just finished loading. */
browser.loadUrl("javascript:window.HTMLOUT.processHTML('<head>'+document.getElementsByTagName('html')[0].innerHTML+'</head>');");
}
});
/* load a web page */
browser.loadUrl("http://lexandera.com/files/jsexamples/gethtml.html");
这篇关于我如何从一个的WebView网页的内容?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!