如何从 WebView 获取网页内容? [英] How do I get the web page contents from a WebView?
问题描述
在 Android 上，我有一个显示页面的 WebView.
On Android, I have a WebView that is displaying a page.
如何在不再次请求页面的情况下获取页面源?
How do I get the page source without requesting the page again?
似乎 WebView 应该有某种返回字符串的 getPageSource() 方法，但可惜它没有.
It seems WebView should have some kind of getPageSource() method that returns a string, but alas it does not.
如果我启用 JavaScript，在此调用中放入什么合适的 JavaScript 来获取内容?
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'; " +
"})()");
推荐答案
我知道这是一个迟到的答案，但我发现了这个问题，因为我遇到了同样的问题.我想我在关于 lexandera 的这篇文章中找到了答案.com.下面的代码基本上是从网站上剪切和粘贴的.似乎可以解决问题.
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");
这篇关于如何从 WebView 获取网页内容?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！
