how to get html content from a webview?

Question

Which is the simplest method to get html code from a webview? I have tried several methods from stackoverflow and google, but can't find an exact method. Please mention an exact way.

public class htmldecoder extends Activity implements OnClickListener,TextWatcher
{
TextView txturl;
Button btgo;
WebView wvbrowser;
TextView txtcode;
ImageButton btcode;
LinearLayout llayout;
int flagbtcode;
public void onCreate(Bundle savedInstanceState)
{
            super.onCreate(savedInstanceState);
                setContentView(R.layout.htmldecoder);

    txturl=(TextView)findViewById(R.id.txturl);

    btgo=(Button)findViewById(R.id.btgo);
    btgo.setOnClickListener(this);

    wvbrowser=(WebView)findViewById(R.id.wvbrowser);
    wvbrowser.setWebViewClient(new HelloWebViewClient());
    wvbrowser.getSettings().setJavaScriptEnabled(true);
    wvbrowser.getSettings().setPluginsEnabled(true);
    wvbrowser.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
    wvbrowser.addJavascriptInterface(new MyJavaScriptInterface(),"HTMLOUT");
    //wvbrowser.loadUrl("http://www.google.com");
    wvbrowser.loadUrl("javascript:window.HTMLOUT.showHTML('<html>'+document.getElementsByTagName('html')[0].innerHTML+'</html>');");


    txtcode=(TextView)findViewById(R.id.txtcode);
    txtcode.addTextChangedListener(this);

    btcode=(ImageButton)findViewById(R.id.btcode);
    btcode.setOnClickListener(this);

    }

public void onClick(View v)
{
    if(btgo==v)
    {
        String url=txturl.getText().toString();
        if(!txturl.getText().toString().contains("http://"))
        {
            url="http://"+url;
        }
        wvbrowser.loadUrl(url);
        //wvbrowser.loadData("<html><head></head><body><div style='width:100px;height:100px;border:1px red solid;'></div></body></html>","text/html","utf-8");
    }
    else if(btcode==v)
    {
        ViewGroup.LayoutParams params1=wvbrowser.getLayoutParams();
        ViewGroup.LayoutParams params2=txtcode.getLayoutParams();
        if(flagbtcode==1)
        {
            params1.height=200;
            params2.height=220;
            flagbtcode=0;
            //txtcode.setText(wvbrowser.getContentDescription());
        }
        else
        {
            params1.height=420;
            params2.height=0;
            flagbtcode=1;
        }
        wvbrowser.setLayoutParams(params1);
        txtcode.setLayoutParams(params2);

    }
}

public class HelloWebViewClient extends WebViewClient {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {

        view.loadUrl(url);
        return true;
    }
    /*@Override
    public void onPageFinished(WebView view, String url)
    {
        // This call inject JavaScript into the page which just finished loading. 
        wvbrowser.loadUrl("javascript:window.HTMLOUT.processHTML('<head>'+document.getElementsByTagName('html')[0].innerHTML+'</head>');");
    }*/

}
class MyJavaScriptInterface
{
    @SuppressWarnings("unused")
    public void showHTML(String html)
    {

        txtcode.setText(html);
    }
}

public void afterTextChanged(Editable s) {
    // TODO Auto-generated method stub

}

public void beforeTextChanged(CharSequence s, int start, int count,
        int after) {
    // TODO Auto-generated method stub

}

public void onTextChanged(CharSequence s, int start, int before, int count) {
    wvbrowser.loadData("<html><div"+txtcode.getText().toString()+"></div></html>","text/html","utf-8");

}

}

score 113 · Answer 1 · edited May 23 '17 at 12:10

113

Actually this question has many answers. Here are 2 of them :

This first is almost the same as yours, I guess we got it from the same tutorial.

public class TestActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.webview);
        final WebView webview = (WebView) findViewById(R.id.browser);
        webview.getSettings().setJavaScriptEnabled(true);
        webview.addJavascriptInterface(new MyJavaScriptInterface(this), "HtmlViewer");

        webview.setWebViewClient(new WebViewClient() {
            @Override
            public void onPageFinished(WebView view, String url) {
                webview.loadUrl("javascript:window.HtmlViewer.showHTML" +
                        "('<html>'+document.getElementsByTagName('html')[0].innerHTML+'</html>');");
            }
        });

        webview.loadUrl("http://android-in-action.com/index.php?post/" +
                "Common-errors-and-bugs-and-how-to-solve-avoid-them");
    }

    class MyJavaScriptInterface {

        private Context ctx;

        MyJavaScriptInterface(Context ctx) {
            this.ctx = ctx;
        }

        public void showHTML(String html) {
            new AlertDialog.Builder(ctx).setTitle("HTML").setMessage(html)
                    .setPositiveButton(android.R.string.ok, null).setCancelable(false).create().show();
        }

    }
}

This way your grab the html through javascript. Not the prettiest way but when you have your javascript interface, you can add other methods to tinker it.

An other way is using an HttpClient like there.

The option you choose also depends, I think, on what you intend to do with the retrieved html...

edited May 23 '17 at 12:10

Community

1
1

answered Nov 20 '11 at 11:41

Sephy

50,022
30
123
131

when execute this line `webview.loadUrl("javascript:window.HtmlViewer.showHTML" + "(''+document.getElementsByTagName('html')[0].innerHTML+'');");` the program act like function finish(),and stop that activity.why?how to solve it? – Nov 20 '11 at 13:44
any idea about this?alternative methods? – Jan 11 '12 at 08:03
7

webview.addJavascriptInterface Only works on Jelly Beans and lower version. – xtr Mar 20 '13 at 03:40
34

Two important changes to the above code for Jellybean and later: 1. Remove "window." from the webview.loadUrl line - the javascript interface is attached differently when targeting Jellybean. 2. Put @JavascriptInterface before "public void showHTML" - this is necessary since it's a security risk not to only allow certain methods to be called. – karlbecker_com May 28 '13 at 16:55
And if I would like to use this in a widget? Somebody can help me? http://stackoverflow.com/questions/20826704/widget-that-retrieve-data-from-several-html-pages – Accollativo Feb 04 '14 at 09:05
1

Still doesn't work for me (5.1.1).. When I'm adding MyJavaScriptInterface (with @karlbecker_com hints) when I'm clicking something on loaded page system asks me to choose browser. When I remove this, it won't ask me again. – Makalele Oct 03 '15 at 21:57
this works for me, the web view was hiding the html, now solve it, thanks – Carlos Carrizales Mar 10 '16 at 15:11
I used this on Android 6.0. Furthermore I added @JavascriptInterface in front of showHTML as already mentioned. Works like a charm! – Cédric Portmann Nov 16 '16 at 18:55
Is there any way to get this HTML formated properly? (not in one line) – shurrok Sep 12 '17 at 12:39
This solution is not deterministic. On webpages with own js code executing javascript wigh loadUrl might not work. On andorid 4.4.2 loadUrl with javascript is not working even if web page is pure html. My final solution was load web page with OkHttp and then pass it to WebView.loadDataWithBaseURL(...). Setting valid url WebView will download all dependencies linked in html. – marioc64 Nov 03 '17 at 12:19
2

Here I enabled the remote debugging, it showed `Uncaught ReferenceError: HtmlViewer is not defined`, no matter with or without `@JavascriptInterface` – MewX Dec 13 '17 at 12:31
Don't forget to add INTERNET permission (I did)! – Benur21 May 14 '21 at 14:46
why not use: document.documentElement instead of document.getElementsByTagName('html')[0] – J Davies Jan 19 '22 at 12:50

score 86 · Answer 2 · edited May 23 '17 at 12:18

86

In KitKat and above, you could use evaluateJavascript method on webview

wvbrowser.evaluateJavascript(
        "(function() { return ('<html>'+document.getElementsByTagName('html')[0].innerHTML+'</html>'); })();",
         new ValueCallback<String>() {
            @Override
            public void onReceiveValue(String html) {
                Log.d("HTML", html); 
                // code here
            }
    });

See this answer for more examples

edited May 23 '17 at 12:18

Community

1
1

answered Aug 16 '15 at 22:30

Akash

13,107
1
25
19

1

this is by far the easiest solution to use here – Billy Nov 23 '15 at 11:48
9

FYI - Requires API 19. – Joel Oct 27 '16 at 13:46
10

Remember to put this into the onPageFinished method. – Cédric Portmann Nov 16 '16 at 19:06
@Joel How to achieve this below API 19? – Pratik Saluja Jun 01 '20 at 12:48
@PratikSaluja Look at other answers too. This is just a concise way to do it in API 19 and up. There are other ways to do it. – Akash Jun 04 '20 at 15:54
@AkashKurianJose That doesn't answer my problem. In fact, that's the indirect diversion to another topic. It's common we are here always looking for answers and questions that need not to remind. Anyways, thanks, I got the answer from some other post. – Pratik Saluja Jun 08 '20 at 06:00
1

@PratikSaluja extremely sorry if my comment conveyed the wrong idea. The answer with most upvotes here is much older than my own answer and would probably work for you. Didn't mean anything beyond that. Very glad that you found the answer by looking elsewhere BTW. – Akash Jun 09 '20 at 23:39

score 43 · Answer 3 · edited Mar 27 '21 at 17:34

43

For android 4.2, dont forget to add @JavascriptInterface to all javascript functions

edited Mar 27 '21 at 17:34

danronmoon

3,814
5
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answered Mar 27 '13 at 15:35

user1842354

571
4
5

1

Works for android 4.2 and ABOVE. – Cédric Portmann Nov 16 '16 at 18:55

yorkw · Answer 4 · 2012-03-07T21:51:49.897

Android WebView is just another render engine that render HTML contents downloaded from a HTTP server, much like Chrome or FireFox. I don't know the reason why you need get the rendered page (or screenshot) from WebView. For most of situation, this is not necessary. You can always get the raw HTML content from HTTP server directly.

There are already answers posted talking about getting the raw stream using HttpUrlConnection or HttpClient. Alternatively, there is a very handy library when dealing with HTML content parse/process on Android: JSoup, it provide very simple API to get HTML contents form HTTP server, and provide an abstract representation of HTML document to help us manage HTML parsing not only in a more OO style but also much easily:

// Single line of statement to get HTML document from HTTP server.
Document doc = Jsoup.connect("http://en.wikipedia.org/").get();

It is handy when, for example, you want to download HTML document first then add some custom css or javascript to it before passing it to WebView for rendering. Much more on their official web site, worth to check it out.

Not usefull when you need javascript enabled browser to get HTML . e.g twitter.com — ashwath hegde, Feb 01 '22 at 11:23
In my case, I use WebView to let users edit the HTML page and then need to get result of the editing. — Bratyslav Morhunov, Nov 18 '22 at 12:17

score 6 · Answer 5 · answered Jan 13 '13 at 19:17

One touch point I found that needs to be put in place is "hidden" away in the Proguard configuration. While the HTML reader invokes through the javascript interface just fine when debugging the app, this works no longer as soon as the app was run through Proguard, unless the HTML reader function is declared in the Proguard config file, like so:

-keepclassmembers class <your.fully.qualified.HTML.reader.classname.here> {
    public *; 
}

Tested and confirmed on Android 2.3.6, 4.1.1 and 4.2.1.

score 6 · Answer 6 · answered May 25 '22 at 14:49

with(webView) {
    settings.javaScriptEnabled = true
    webViewClient = object : WebViewClient() {
        override fun onPageFinished(view: WebView?, url: String?) {
            view?.evaluateJavascript("document.documentElement.outerHTML") {
                val html = it.replace("\\u003C", "<")
            }
        }
    }
}

score 4 · Answer 7 · edited May 23 '17 at 12:02

Android will not let you do this for security concerns. An evil developer could very easily steal user-entered login information.

Instead, you have to catch the text being displayed in the webview before it is displayed. If you don't want to set up a response handler (as per the other answers), I found this fix with some googling:

URL url = new URL("https://stackoverflow.com/questions/1381617");
URLConnection con = url.openConnection();
Pattern p = Pattern.compile("text/html;\\s+charset=([^\\s]+)\\s*");
Matcher m = p.matcher(con.getContentType());
/* If Content-Type doesn't match this pre-conception, choose default and 
 * hope for the best. */
String charset = m.matches() ? m.group(1) : "ISO-8859-1";
Reader r = new InputStreamReader(con.getInputStream(), charset);
StringBuilder buf = new StringBuilder();
while (true) {
  int ch = r.read();
  if (ch < 0)
    break;
  buf.append((char) ch);
}
String str = buf.toString();

This is a lot of code, and you should be able to copy/paster it, and at the end of it str will contain the same html drawn in the webview. This answer is from Simplest way to correctly load html from web page into a string in Java and it should work on Android as well. I have not tested this and did not write it myself, but it might help you out.

Also, the URL this is pulling is hardcoded, so you'll have to change that.

score 1 · Answer 8 · edited May 23 '17 at 12:26

Why not get the html first then pass it to the web view?

private String getHtml(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();
    }

    return pageHTML;
}

@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);

            //Do what you want to with the html
            String html = getHTML(url);

            if( html!=null && !url.equals(lastLoadedURL)){
                lastLoadedURL = url;
                webview.loadDataWithBaseURL(url, html, null, "utf-8", url);
            }
}

This should roughly do what you want to do. It is adapted from Is it possible to get the HTML code from WebView and shout out to https://stackoverflow.com/users/325081/aymon-fournier for his answer.

HttpClient was deprecated in API Level 22 and removed in API Level 23. So the classes mentioned in your code cannot be imported in the java files. — Dhananjay M, Oct 16 '17 at 10:21

score 1 · Answer 9 · answered Mar 17 '12 at 18:34

I would suggest instead of trying to extract the HTML from the WebView, you extract the HTML from the URL. By this, I mean using a third party library such as JSoup to traverse the HTML for you. The following code will get the HTML from a specific URL for you

public static String getHtml(String url) throws ClientProtocolException, IOException {
        HttpClient httpClient = new DefaultHttpClient();
        HttpContext localContext = new BasicHttpContext();
        HttpGet httpGet = new HttpGet(url);
        HttpResponse response = httpClient.execute(httpGet, localContext);
        String result = "";

        BufferedReader reader = new BufferedReader(
            new InputStreamReader(
                response.getEntity().getContent()
            )
        );

        String line = null;
        while ((line = reader.readLine()) != null){
            result += line + "\n";
        }
        return result;
    }

suppose the url obtain is reached by posting data . this method will fail. — Jafar Ali, Dec 05 '14 at 12:34

score 0 · Answer 10 · answered Feb 13 '12 at 02:47

0

try using HttpClient as Sephy said:

public String getHtml(String url) {
    HttpClient vClient = new DefaultHttpClient();
    HttpGet vGet = new HttpGet(url);
    String response = "";    

    try {
        ResponseHandler<String> vHandler = new BasicResponseHandler();
        response = vClient.execute(vGet, vHandler);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return response;
}

answered Feb 13 '12 at 02:47

Christoper Hans

625
4
19

can you show a simple working example.i cannot implement your code in sephy's example – KIRAN K J Feb 18 '12 at 10:41
this method will get the html source of the given url. i.e. getHtml(http://www.google.com); will get you the source of google main page – Christoper Hans Feb 20 '12 at 01:39
its ok.is there any option to get webview source. `THANKS` – KIRAN K J Feb 20 '12 at 02:46
This somewhat didn't work for me. I did not get any content from a test site which content had been "hello world". – Momro Mar 06 '13 at 10:28
@ChristoperHans This seems to be an **alternative** to WebView, not really getting the content from WebView? – WebViewer Dec 05 '22 at 15:13

score 0 · Answer 11 · answered Mar 11 '12 at 06:40

Its Simple to implement Just need javasript methods in your html to get value of html content. As Above your code some changes to be need.

  public class htmldecoder extends Activity implements OnClickListener,TextWatcher
    {
    Button btsubmit; // this button in your xml file
    WebView wvbrowser;
    public void onCreate(Bundle savedInstanceState)
    {
                super.onCreate(savedInstanceState);
                    setContentView(R.layout.htmldecoder);



        btsubmit=(Button)findViewById(R.id.btsubmit);
        btsubmit.setOnClickListener(this);

        wvbrowser=(WebView)findViewById(R.id.wvbrowser);
        wvbrowser.setWebViewClient(new HelloWebViewClient());
        wvbrowser.getSettings().setJavaScriptEnabled(true);
        wvbrowser.getSettings().setPluginsEnabled(true);
        wvbrowser.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
        MyJavaScriptInterface myinterface=new MyJavaScriptInterface();
        wvbrowser.addJavascriptInterface(myinterface,"interface");
        webView.loadUrl("file:///android_asset/simple.html");  //use one html file for //testing put your html file in assets. Make sure that you done JavaScript methods to get //values for html content in html file . 
   }
   public void onClick(View v)
{
    if(btsubmit==v)
    {

        webView.loadUrl("javascript:showalert()");// call javascript method.  
        //wvbr
    }
}

final class MyJavaScriptInterface {



        MyJavaScriptInterface() {

        }

        public void sendValueFromHtml(String value) {
           System.out.println("Here is the value from html::"+value);
        }

    }

}

Your Javascript in html

 <script type="text/javascript">
    //<![CDATA[
    var n1;
    function callme(){
    n1=document.getElementById("FacadeAL").value;
    }
    function showalert(){
     window.interface.sendValueFromHtml(n1);// this method calling the method of interface which //you attached to html file in android. // & we called this showalert javasript method on //submmit buttton click of android. 
    }
    //]]>
    </script>

& Make sure you calling callme like below in html

<input name="FacadeAL" id="FacadeAL" type="text" size="5" onblur="callme()"/>
Hope this will help you.

what does this means `& Make sure you calling callme like below in html`.Did you mean to place the input tag below the script in html file ? `Thank You` — , Mar 12 '12 at 11:16
no dude you have to call javasript method callme() onblur of input type text in html tag. — Mr. Sajid Shaikh, Mar 12 '12 at 12:43
this code work like ,when loading activity there is a text box in the webview and the typed text shows at the text box.But i want the html code in the webview. — , Mar 13 '12 at 06:24
can u help me to sort out this problem? `Thank you very much` — , Mar 15 '12 at 05:36

score 0 · Answer 12 · answered Mar 15 '12 at 15:42

I suggest to try out some Reflection approach, if you have time to spend on the debugger (sorry but I didn't have).

Starting from the loadUrl() method of the android.webkit.WebView class:

http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/2.2_r1.1/android/webkit/WebView.java#WebView.loadUrl%28java.lang.String%2Cjava.util.Map%29

You should arrive on the android.webkit.BrowserFrame that call the nativeLoadUrl() native method:

http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/2.2_r1.1/android/webkit/BrowserFrame.java#BrowserFrame.nativeLoadUrl%28java.lang.String%2Cjava.util.Map%29

The implementation of the native method should be here:

http://gitorious.org/0xdroid/external_webkit/blobs/a538f34148bb04aa6ccfbb89dfd5fd784a4208b1/WebKit/android/jni/WebCoreFrameBridge.cpp

Wish you good luck!

score -3 · Answer 13 · answered Feb 15 '12 at 06:00

above given methods are for if you have an web url ,but if you have an local html then you can have also html by this code

AssetManager mgr = mContext.getAssets();
             try {
InputStream in = null;              
if(condition)//you have a local html saved in assets
                            {
                            in = mgr.open(mFileName,AssetManager.ACCESS_BUFFER);
                           }
                            else if(condition)//you have an url
                            {
                            URL feedURL = new URL(sURL);
                  in = feedURL.openConnection().getInputStream();}

                            // here you will get your html
                 String sHTML = streamToString(in);
                 in.close();

                 //display this html in the browser or web view              


             } catch (IOException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
             }
        public static String streamToString(InputStream in) throws IOException {
            if(in == null) {
                return "";
            }

            Writer writer = new StringWriter();
            char[] buffer = new char[1024];

            try {
                Reader reader = new BufferedReader(new InputStreamReader(in, "UTF-8"));

                int n;
                while ((n = reader.read(buffer)) != -1) {
                    writer.write(buffer, 0, n);
                }

            } finally {

            }

            return writer.toString();
        }

how to get html content from a webview?

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