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"));
Related
i am trying to load only a specific element in my webview webpage ('contentbody').
but i dont know how to modify my code to load that only. i can block elements in my webview by using this simple javascript.
public void onLoadResource(WebView view, String url) {
super.onLoadResource(view, url);
// Removes element which id = 'mastHead'
view.loadUrl("javascript:(function() { "
+ "(elem = document.getElementById('smsform')).parentNode.removeChild(elem); "
+ "})()");
}
An option might be to use Jsoup, to load the HTML page from the website, extract the desired portion of the HTML, and then load just that into your WebView. A small example of how it could be done:
Document doc = Jsoup.connect("http://example.com/").get();
myWebView.loadDataWithBaseURL("http://example.com/", doc.select(".contentbody").first().outerHtml(), "text/html", "UTF-8", null);
With this, you use Jsoup to extract the first item with contentbody class from the HTML, and then directly load it into your WebView.
I'm developing an application witch uses WebView to render custom html.
But when I call
loadDAtaWithBaseURL(URL, "<html><h1>TEST</h1></html>", "text/html; charset=utf-8;", "utf-8", null);
it shows html itself (not rendered one) on Genymotion emulator.
On my HTC-one, it works fine with rendered html.
Each result is showed as attached.
Does anyone have a same problem or solution?
Thanks.
Don't enter mimeType below KitKat.
fun getMimeType(): String? {
return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
"text/html; charset=utf-8"
} else {
null
}
}
loadDAtaWithBaseURL(URL, "<html><h1>TEST</h1></html>", getMimeType(), "utf-8", null);
Java:
if(Build.VERSION.SDK_INT < 21)
webView.loadDataWithBaseURL("about:blank","<html><h1>TEST</h1></html>","text/html", "UTF-8",null);
else
webView.loadDataWithBaseURL("about:blank","<html><h1>TEST</h1></html>","text/html; charset=utf-8", "UTF-8",null);
Regarding the info you have given, i can not have a clear debug for the issue, but this is how it should be done, just to check if you missed something
First, add this line to your activity in the manifest file
Load your data using
public void loadDataWithBaseURL (String baseUrl, String data, String mimeType, String encoding, String historyUrl);
And this is done this way
loadDataWithBaseURL(Url, data, "text/html", "UTF-8", historyUrl)
Note that
If the base URL uses the data scheme, this method is equivalent to calling loadData() and the historyUrl is ignored, and the data will be treated as part of a data: URL. If the base URL uses any other scheme, then the data will be loaded into the WebView as a plain string (i.e. not part of a data URL) and any URL-encoded entities in the string will not be decoded.
I am working on an app where i need to pass parameters to url while loading html file in webview from assets folder. If I am passing parameters webview was not loading & If not it's working good. The following code is working in 2.1 & 2.3 versions but coming to 4.0 version it's not working.
code:
webview.loadUrl("file:///android_asset/index.html"); //this is working
webview.loadUrl("file:///android_asset/index.html?" + parameters); //this is not working
//to pass parameters I am adding "?" at the end & it's not working.
Can anyone please help me with any alternative code for passing parameters to the following url.
Could you add a JavaScript method to your HTML and pass the parameters in via that function after loading the page? Something like ...
<script type="text/javascript">
function receiveParameters(p) {
// Do something with p
}
</script>
webview.loadUrl("file:///android_asset/index.html");
webview.evaluateJavascript("receiveParameters(" + parameters + ");", null);
I have solved it...
String filePath = "/data/user/0/~/files/public";
//launchUrl = String.format("%s/index.html?id=test", filePath);
//-->
launchUrl = String.format("file://%s/index.html?id=test", filePath);
webview.loadUrl(launchUrl);
You can use shouldInterceptRequest to remove the query before assetLoader seek for the file:
webview.webViewClient = object : WebViewClient() {
override fun shouldInterceptRequest(
view: WebView,
request: WebResourceRequest
): WebResourceResponse? {
if (request.url.host == "appassets.androidplatform.net") {
// Do any logic you want to remove disturb parmeters
var url = request.url
if (request.url.queryParameterNames.contains("yourparam")) {
url = Uri.parse(request.url.toString().split("?")[0])
}
return assetLoader.shouldInterceptRequest(url)
}
}
}
Now your html will be available to handle the parameters. But the assets loader do not care.
I'm loading an html asset page into a WebView using
webMain.loadUrl("file:///android_asset/record.html");
which works fine, but inside the html are a number of places where I'd like to use information from the app. For instance, the HTML may contain text that reads "[Custom]". Is there a way I can replace that word with information passed from the application?
This is an old and already accepted question, however I am sure that the problem can be solved in more elegant way by using javascript.
Keep the html file in your assets folder and surround the text which you want to replace into with div elements with unique id's.
<html>
<head> ... <head>
<body>
Static text
<div id="replace1">replace me</div>
<div id="replace2">replace me too</div>
More static text ...
</body>
</html>
Now create a javascript function which will replace the innerHtml of a div with an id:
function replace(id, newContent)
{
document.getElementById(id).innerHTML = newContent;
}
This function will be best placed directly in the html file, update the <head> section to look like this:
<head>
...
<script type="text/javascript">
function replace(id, newContent)
{
document.getElementById(id).innerHTML = newContent;
}
</script>
</head>
Now we need to call the javascript function from from the WebView Android api:
WebView helpView = (WebView)findViewById(R.id.helpView);
helpView.getSettings().setJavaScriptEnabled(true);
helpView.setWebViewClient(new WebViewClient() {
#Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
view.loadUrl("javascript:replace('replace1', 'new content 1')");
view.loadUrl("javascript:replace('replace2', 'new content 2')");
}
});
helpView.loadUrl("file:///android_asset/help.html");
Using this you will avoid reading potentially large data into memory and running expensive operations on it unnecessarily.
This is worked for me.
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Payment Demo</title>
</head>
<body>
<div>
<input type="text" id="uname " name="uname " value="">
<input type="text" id="pass" name="pass" value="">
</div>
</body>
</html>
This is java code.
WebView wb = (WebView) findViewById(R.id.webView1);
wb.loadUrl("file:///android_asset/web1.html");
wb.getSettings().setJavaScriptEnabled(true);
wb.setWebViewClient(new WebViewClient() {
#Override
public void onPageFinished(WebView web, String url) {
// TODO Auto-generated method stub
String uname = "email#mail.com";
String pass = "******";
web.loadUrl("javascript:(function(){document.getElementById('uname').value = '"+uname+"';})()");
web.loadUrl("javascript:(function(){document.getElementById('pass').value = '"+pass+"';})()");
}
});
Actually I do not understand why the file size of record.html will affect maintainence of the code. Read the html string (using Java reader class or what ever) from the html file in asset, use replaceAll function with Regex to replace all the [Custom] in the html file. How long the html is should not really affect how you maintain the code. It should rather be a performance problem, or the string is really really long that exceeds the java String limit.
some code I have used before :
InputStream is = getApplicationContext().getAssets().open("details/product_jsmodify.html");
Reader r = new InputStreamReader(is);
String details = Utils.readertoString(r);
details = details.replace("%product_name%",productName );
Utils is my class doing the conversion to string. I am not using Regex here as I am only replacing word for once. Then I load the string like Cata does. It is quite clean I suppose.
Yes you can do that by loading your page in a String and then load that string in your WebView.
Eg:
String summary = "<html><body>You scored <b>192</b> points.</body></html>";
webview.loadData(summary, "text/html", null);
Taken from here
This one worked for me, with the html along with the text and images.
InputStream is = getAssets().open(html_name);
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
String str = new String(buffer);
str = str.replace("InitialTextToBeReplaced", "TextAfterReplacement");
//Now instead of webview.loadURL(""), I needed to do something like -
webView.loadDataWithBaseURL("file:///android_asset/", str, "text/html", "UTF-8",null);
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