Rendering HTML in a WebView with custom CSS
AndroidHtmlCssWebviewAndroid Problem Overview
My app is using JSoup to download the HTML of a message board page (let's say in this case it is a page containing the posts of a given thread). I'd like to take this HTML, strip out unwanted items, and apply custom CSS to style it to be 'mobile' in a WebView.
Should I inject the styles into the HTML as I process it (since I will be processing it anyway) or is there a good way to add a CSS file to my app's assets and simply refer to it. I figure the latter would be ideal, but unsure how to go about it.
I see hints in WebView's loadDataWithBaseURL that you can refer to local assets, but not sure how to utilize it.
Android Solutions
Solution 1 - Android
You could use WebView.loadDataWithBaseURL
htmlData = "<link rel=\"stylesheet\" type=\"text/css\" href=\"style.css\" />" + htmlData;
// lets assume we have /assets/style.css file
webView.loadDataWithBaseURL("file:///android_asset/", htmlData, "text/html", "UTF-8", null);
And only after that WebView will be able to find and use css-files from the assets directory.
ps And, yes, if you load your html-file form the assets folder, you don't need to specify a base url.
Solution 2 - Android
I assume that your style-sheet "style.css" is already located in the assets-folder
-
load the web-page with jsoup:
doc = Jsoup.connect("http://....").get(); -
remove links to external style-sheets:
// remove links to external style-sheets doc.head().getElementsByTag("link").remove(); -
set link to local style-sheet:
// set link to local stylesheet // <link rel="stylesheet" type="text/css" href="style.css" /> doc.head().appendElement("link").attr("rel", "stylesheet").attr("type", "text/css").attr("href", "style.css"); -
make string from jsoup-doc/web-page:
String htmldata = doc.outerHtml(); -
display web-page in webview:
WebView webview = new WebView(this); setContentView(webview); webview.loadDataWithBaseURL("file:///android_asset/.", htmlData, "text/html", "UTF-8", null);
Solution 3 - Android
here is the solution
Put your html and css in your /assets/ folder, then load the html file like so:
WebView wv = new WebView(this);
wv.loadUrl("file:///android_asset/yourHtml.html");
then in your html you can reference your css in the usual way
<link rel="stylesheet" type="text/css" href="main.css" />
Solution 4 - Android
It's as simple as is:
WebView webview = (WebView) findViewById(R.id.webview);
webview.loadUrl("file:///android_asset/some.html");
And your some.html needs to contain something like:
<link rel="stylesheet" type="text/css" href="style.css" />
Solution 5 - Android
If you have your CSS in the internal file storage you can use
//Get a reference to your webview
WebView web = (WebView)findViewById(R.id.webby);
// Prepare some html, it is formated with css loaded from the file style.css
String webContent = "<!DOCTYPE html><html><head><meta charset=\"UTF-8\"><link rel=\"stylesheet\" href=\"style.css\"></head>"
+ "<body><div class=\"running\">I am a text rendered with INDIGO</div></body></html>";
//get and format the path pointing to the internal storage
String internalFilePath = "file://" + getFilesDir().getAbsolutePath() + "/";
//load the html with the baseURL, all files relative to the baseURL will be found
web.loadDataWithBaseURL(internalFilePath, webContent, "text/html", "UTF-8", "");
Solution 6 - Android
Is it possible to have all the content rendered in-page, in a given div? You could then reset the css based on the id, and work on from there.
Say you give your div id="ocon"
In your css, have a definition like:
#ocon *{background:none;padding:0;etc,etc,}
and you can set values to clear all css from applying to the content. After that, you can just use
#ocon ul{}
or whatever, further down the stylesheet, to apply new styles to the content.
Solution 7 - Android
You can Use Online Css link To set Style over existing content.
For That you have to load data in webview and enable JavaScript Support.
See Below Code:
WebSettings webSettings=web_desc.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setDefaultTextEncodingName("utf-8");
webSettings.setTextZoom(55);
StringBuilder sb = new StringBuilder();
sb.append("<HTML><HEAD><LINK href=\" http://yourStyleshitDomain.com/css/mbl-view-content.css\" type=\"text/css\" rel=\"stylesheet\"/></HEAD><body>");
sb.append(currentHomeContent.getDescription());
sb.append("</body></HTML>");
currentWebView.loadDataWithBaseURL("file:///android_asset/", sb.toString(), "text/html", "utf-8", null);
Here Use StringBuilder to append String for Style.
sb.append("<HTML><HEAD><LINK href=\" http://yourStyleshitDomain.com/css/mbl-view-content.css\" type=\"text/css\" rel=\"stylesheet\"/></HEAD><body>");
sb.append(currentHomeContent.getDescription());