How do I inject a custom CSS file into a WebView?
I am using Jsoup to extract the HTML Code, then I remove the existing CSS file. I do not know how to inject my local CSS file to the HTML code properly. I am using Stackoverflow as an example. This is some portion of my code. My test.css file is in the assets folder.
Document doc;
String htmlcode = "";
web = (WebView) findViewById(R.id.webView1);
try {
doc = Jsoup.connect("http://stackoverflow.com/users").get();
doc.head().getElementsByTag("link").remove();
doc.head().appendElement("link").attr("rel", "stylesheet")
.attr("type", "text/css").attr("href", "test.css");
htmlcode = doc.html();
web = (WebView) findViewById(R.id.webView1);
web.loadDataWithBaseURL("file:///android_asset/test.css",
htmlcode, "text/html", "UTF-8", null);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
This is what's inside my test.css file, it's the same CSS file being used by Stackoverflow.
Here's a link!
Thank you and I appreciate your time!
Instead of loadDataWithBaseURL try
web.loadUrl("file:///android_asset/test.css");
Related
I can show up HTML file content in android webview well.Now how could i pass parameter into HTML file.For ex.my HTML content has an video player
i need to pass dynamic values(URL) into HTML file for playing dynamic video.My HTML file is located on asset folder.How could i do this?
Thanks.
I came upon this problem today, however I needed this to work with UTF-8 encoding, so this was my approach, hopefully it will help someone and clarify some of the previous answers to this question.
HTML:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<h1>%ERR_TITLE%</h1>
<h2>%ERR_DESC%</h2>
</body>
</html>
Java:
String content = IOUtils.toString(getAssets().open("error.html"))
.replaceAll("%ERR_TITLE%", getString(R.string.error_title))
.replaceAll("%ERR_DESC%", getString(R.string.error_desc))
mWebView.loadDataWithBaseURL("file:///android_asset/error.html", content, "text/html", "UTF-8", null);
As for IOUtils:
http://commons.apache.org/proper/commons-io/download_io.cgi
Instead of passing directly the video URL (following you example), i would have used tokens in the Html file. For example:
<embed src="$VIDEO_URL$" autostart="false" />
where the $VIDEO_URL$ will be the token wich will be replaced during the runtime with a real video URL.
Also, since you cannot change the contents of your asset folder during runtime you should load the html file contents into a String variable and use the replace method to replace the token with a real URL and, finally, pass that string to your webview. Something like this:
//The html variable has the html contents of the file stored in the assets folder
//and real_video_url string variable has the correct video url
html = html.replace("$VIDEO_URL$", real_video_url);
webview.loadData(html, "text/html", "utf-8");
If i would like to have something dynamic in my HTML i would have an html with dynamic parts written like this:
<B>%NAME%</B>
Then i would load my HTML:
String template = Utils.inputStreamToString(assets.open("html/template.html"));
then
Then i would replace all dynamics parts with what i want like this:
String data = template.replaceAll("%NAME%", "Alice McGee");
then i would pass it to my webView!
WebView webView = new WebView(this);
webView.loadDataWithBaseURL("file:///android_asset/html/", data, "text/html", "utf-8", null);
I managed to pass variables in a different way.
My problem was that everytime I switched to another app, when coming to the webapp, the webview kept reloading. I guess that's because of the following line in my onCreate() method: myWebView.loadUrl(url); I had the idea to pass these state variables in the url, but as you know it is not possible yet.
What I did was to save the state of some variables using onSaveInstanceState(Bundle outState) {...} and restore them with onRestoreInstanceState(Bundle savedInstanceState){...}.
In onCreate method after setting up myWebView I did the following:
myWebView.setWebViewClient(new WebViewClient() {
#Override
public void onPageFinished(WebView view, String urlString)
{
Log.i("onPageFinished", "loadVariables("+newURL+")");
if(newURL!="")
myWebView.loadUrl("javascript:loadVariables("+"\""+newURL+"\")");
}
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
});
jsInterface = new JSInterface(this,myWebView);
myWebView.addJavascriptInterface(jsInterface, "Android");
if (savedInstanceState != null)
{
// retrieve saved variables and build a new URL
newURL = "www.yoururl.com";
newURL +="?var1=" + savedInstanceState.getInt("key1");
newURL +="?var2=" + savedInstanceState.getInt("key2");
Log.i("myWebApp","NEW URL = " + newURL);
}
myWebView.loadUrl("www.yoururl.com");
So, what it happens is that first I load the page with the default URL (www.yoururl.com) and onPageFinished I call a new javascript method where I pass the variables.
In javascript loadVariables function looks like this:
function loadVariables(urlString){
// if it is not the default URL
if(urlString!="www.yoururl.com")
{
console.log("loadVariables: " + urlString);
// parse the URL using a javascript url parser (here I use purl.js)
var source = $.url(urlString).attr('source');
var query = $.url(urlString).attr('query');
console.log("URL SOURCE = "+source + " URL QUERY = "+query);
//do something with the variables
}
}
here assets means what?
String template = Utils.inputStreamToString(assets.open("html/template.html"));
I'm making an Android app for my board community. The board provider gives me RSS feeds from general categories but don't generate feeds from topics. So I retreive topics URLs from these feeds and want to parse HTML with Jsoup and give it to a WebView.
It works nice except with the select() function which returns nothing.
The "HTML RETREIVED" log gives me : <html><head><title>The topic title</title></head><body></body></html>
h1 tags are in the code on test purpose : it displays well on WebView and the title of the parsed webpage too.
I also putted the log line right after the select() line. It returns nothing too.
I've tried in a pure Java project to parse with Jsoup only and it goes well.
So I assumed something's wrong with Android.
PS : Internet permission is active in the manifest.
Did I miss something ?
Here is the code :
String html;
Bundle param = this.getIntent().getExtras();
String url = param.getString("url");
try {
Document doc = Jsoup.connect(url).get();
doc.select(".topic .clear").remove();
String title = doc.title().toString();
html = doc.select(".username strong, .entry-content").toString();
html = "<html><head><title>"+title+"</title></head><body><h1>"+title+"</h1>"+html+"</body></html>";
WebView webview = new WebView(this);
getWindow().requestFeature(Window.FEATURE_PROGRESS);
setContentView(webview);
webview.getSettings().setJavaScriptEnabled(true);
final Activity activity = this;
webview.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress) {
activity.setProgress(progress * 1000);
Log.d("LOADING",""+ progress);
}
});
webview.loadData(html, "text/html", "UTF-8");
//webview.loadUrl(url);
Log.i("HTML RETREIVED", ""+html);
} catch (IOException e) {
Log.e("ERROR", "Error while generate topic");
}
Ok I've found out something interesting.
The class I wanted to select was not here because I'm getting the mobile version of the webpage. It appears Android App use a mobile user-agent, which is quite normal but not said anywhere.
Anyway I know what thinking about now.
I created a simple html file that loads some images from my local hard-drive (ubuntu).
It is enough to put
<img src=/home/user/directory/image.jpg></img>
Now I need to know if it is the same when Html5 is displayed on a tablet like Android or iOS, or Html5 is used in offline app.
I mean, if html5 can load an image from the device's filesystem just like on my computer, without localStorage or sessionStorage.
If you deploy the application as native application it is possible (wrap it with Phonegap).
For saved HTML files it is not possible.
On Android, it can be done even though it looks a bit tricky at first. Say you have defined a WebView in your layout.xml, which you want to fill with an html file shipped with your application, which in turn should import a png also shipped with your application.
The trick is to put the html file into res/raw and the png into assets.
Example.
Say you have hello.html which should include buongiorno.png.
Within your project, say MyProject, place buongiorno.png into MyProject/assets.
The hello.html goes into MyProject/res/raw (because we want to avoid having it 'optimised' by the android resource compiler), and could look like this:
<html>
<head></head>
<body>
<img src="file:///android_asset/buongiorno.png"/>
<p>Hello world.</p>
</body>
</html>
In your java code, you would put this code:
WebView w = (WebView) findViewById(R.id.myWebview);
String html = getResourceAsString(context, R.raw.hello);
if (html != null) {
w.loadDataWithBaseURL(null, html, "text/html", "UTF-8", null);
}
where getResourceAsString() is defined as follows:
public static String getResourceAsString(Context context, int resid) throws NotFoundException {
Resources resources = context.getResources();
InputStream is = resources.openRawResource(resid);
try {
if (is != null && is.available() > 0) {
final byte[] data = new byte[is.available()];
is.read(data);
return new String(data);
}
} catch (IOException ioe) {
throw new RuntimeException(ioe);
} finally {
try {
is.close();
} catch (IOException ioe) {
// ignore
}
}
return null;
}
I am trying to show an html file in my assets folder but in web view i am seeing white blank page. I got similar example from stackflow only.
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final String mimeType="text/html";
final String encoding="UTF-8";
String htmlString="<html><body>";
Document doc;
WebView wv= new WebView(this);
Elements link = null;
setContentView(wv);
try{
InputStream in=getAssets().open("myweb.html");
byte[] buffer= new byte[in.available()];
in.read(buffer);
in.close();
wv.loadData(new String(buffer), mimeType, encoding);
}
catch(IOException e)
{
Log.d("MyWebView", e.toString());
}
}
you can load the content of the web view using
// add a webview with id #+id/the_webwiev to your main.xml layout file
WebView wv = (WebView)findViewById(R.id.the_webview);
wv.loadUrl("file:///android_asset/myweb.html");
Uhm, did you try following the WebView example from the official webpage? It's really simple.
http://developer.android.com/resources/tutorials/views/hello-webview.html
I followed that and had no trouble implementing a WebView. Your code looks overly complicated for something that is quite simple.
If your file is called pmi_help.html (and located in the /assets/ folder), you load it using:
mWebView.loadUrl("file:///android_asset/pmi_help.html");
Put your html page in asset > www, then load:
mWebView.loadUrl("file:///android_asset/index1.html");
I want to display one static HTML page in my android emulator.
an easier way is described at Android HTML resource with references to other resources. Its working fine for me.
Put the HTML file in the "assets" folder in root, load it using:
webView.loadUrl("file:///android_asset/filename.html");
I'm assuming you want to display your own page in a webview?
Create this as your activity:
public class Test extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
WebView webview = new WebView(this);
setContentView(webview);
try {
InputStream fin = getAssets().open("index.html");
byte[] buffer = new byte[fin.available()];
fin.read(buffer);
fin.close();
webview.loadData(new String(buffer), "text/html", "UTF-8");
} catch (IOException e) {
e.printStackTrace();
}
}
}
This will read the file 'index.html' from your project assets/ folder.
So you can simply use the WebView control to display web content to the screen, which can think of the WebView control as a browser-like view.
You can also dynamically formulate an HTML string and load it into the WebView, using the loadData() method. It takes three arguments. String htmlData, String mimeType and String encoding
First of all you create a “test.html” file and save it into assets folder.
Code:
<html>
<Body bgcolor=“yellow”>
<H1>Hello HTML</H1>
<font color=“red”>WebView Example by Android Devloper</font>
</Body> </html>
if you want see full source code : Display HTML Content in Android