How to retrieve HTML content from WebView (as a string)
How do I retrieve all HTML content currently displayed in a WebView?
I found WebView.loadData() but I couldn't find the opposite equivalent (e.g. WebView.getData())
Please note that I am interested in retrieving that data for web pages that I have no control over (i.e. I cannot inject a Javascript function into those pages, so that that it would call a Javascript interface in WebView).
Answer
You can achieve this through:
final Context myApp = this;
/* An instance of this class will be registered as a JavaScript interface */
class MyJavaScriptInterface
{
@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('<html>'+document.getElementsByTagName('html')[0].innerHTML+'</html>');");
}
});
/* load a web page */
browser.loadUrl("http://lexandera.com/files/jsexamples/gethtml.html");
You will get the whole Html contnet in processHTML method. and it wont make another request for webpage. so it is also more efficient way for doing this.
Thanks.