I have been researching all morning about integrating an android barcode scanner app into a web page, but haven't found exactly what I need to know. I want to have a web page that the user can fill in text fields by using an android barcode scanner. So the user would be on a web page and would either click inside the text field or click a button next to the text field that would start the android barcode scanner. They would then scan the barcode and the text field would be filled in.
I have found solutions on how to do this and then go to a different page, but it is important that the user stays on the same page. I have seen the zxing project and thought that might be able to be used, but I'm not sure if it allows for the page to stay the same.
I'm pretty sure this is possible and is wondering if any one could give me a high level overview on how they would do it. I was thinking it might be able to be done with an ajax request that gets submitted on a button click. The ajax request would get sent to my server, the server would send something to the android device that would start the scanner and return the data which in turn gets sent back in the ajax response. Is there any way to cut out the server though and just have the android browser starting the barcode scanner? Thank you for your time and I appreciate any discussion on it.
ZXing (zebra crossing) provides the capability to initiate the bar code scanner via a webpage through a button click event, anchor tag, or other action that could call a URL on a mobile device.
When the barcode scanner application is installed on an android device, a URL call to:
zxing://scan/?ret=http://foo.com/products/{CODE}/description&SCAN_FORMATS=UPC_A,EAN_13
Will bring up the device bar code reader, the user scans the code, and the code is returned via the callback URL parameter supplied in the zxing URL.
You can view an example (works on android) here: http://zxing.appspot.com/scan
You can try this for Android:
You can use Zxing library for barcode scan for webpages
<!DOCTYPE html>
<script type="text/javascript">
//This entire block of script should be in a separate file, and included in each doc in which you want scanner capabilities
function zxinglistener(e){
localStorage["zxingbarcode"] = "";
if(e.url.split("\#")[0] == window.location.href){
window.focus();
processBarcode(decodeURIComponent(e.newValue));
}
window.removeEventListener("storage", zxinglistener, false);
}
if(window.location.hash != ""){
localStorage["zxingbarcode"] = window.location.hash.substr(1);
self.close();
window.location.href="about:blank";//In case self.close is disabled
}else{
window.addEventListener("hashchange", function(e){
window.removeEventListener("storage", zxinglistener, false);
var hash = window.location.hash.substr(1);
if (hash != "") {
window.location.hash = "";
processBarcode(decodeURIComponent(hash));
}
}, false);
}
function getScan(){
var href = window.location.href.split("\#")[0];
window.addEventListener("storage", zxinglistener, false);
zxingWindow = window.open("zxing://scan/?ret=" + encodeURIComponent(href + "#{CODE}"),'_self');
}
</script>
<html>
<head>
<script type="text/javascript">
function processBarcode(b){
var d = document.createElement("div");
d.innerHTML = b;
document.body.appendChild(d);
}
</script>
</head>
<body>
<button onclick="getScan()">get Scan</button>
</body>
</html>
For reference: Read link
Using a javascript interface and loadurl(javascript...) you can communicate with your webpage from Android
public void loadScript(String script){
webview.loadUrl("javascript:(function() { " + script + "})()");
}
private class JavaScriptInterface {
public void startQRScan() {
...
}
}
There are plenty of examples on google.
Related
I'm using the following html code. I'm able to get a video stream on my desktop, but I'm getting a grey play button in the android webView app. I'm serving this over a https connection.
Please guide me as Im new to both of these code snippets.
HTML
<div id="video-container">
<video id="camera-stream" width="500" autoplay></video>
</div>
Script.js
window.onload = function() {
navigator.getUserMedia = (navigator.getUserMedia ||
navigator.webkitGetUserMedia ||
navigator.mozGetUserMedia ||
navigator.msGetUserMedia);
if (navigator.getUserMedia) {
navigator.getUserMedia({ video: true },
function(localMediaStream) {
var vid = document.getElementById('camera-stream');
vid.srcObject = localMediaStream;
},
function(err) {
console.log('The following error occurred when trying to use getUserMedia: ' + err);
}
);
} else { alert('Sorry, your browser does not support getUserMedia'); }
}
This screenshot is taken from my desktop chrome browser.
and this is taken from my phone webView.
I know this is an old thread but I recently run into the same issue and only after a lot of tries I finally found the solution.
If you see this play button all the permission should be set correctly.
It seems that the webview is waiting for an user interaction to start the stream but tapping on the icon does not starts the video (idk how the user should "approve" the streaming)
The solution is to change the setting of the webview in you webapp:
webView.settings.mediaPlaybackRequiresUserGesture = false;
In this way the stream starts correctly without any user interaction
I'm new at android/java language. I have a web service that requests 2 params and returns a state (estado).
Every time i try to login with wrong user name and password the stop.
JSONObject obj = new JSONObject(response);
if( "ERRO".equals(obj.getString("estado"))) {
errorMsg.setText(obj.getString("info"));
Toast.makeText(getApplicationContext(), obj.getString("info"), Toast.LENGTH_LONG).show();
return;
}
I want to if have a wrong login to return to main activity. Can anyone help?
<body onload="init()">
<img src="loading.gif" id="loading_gif">
<script>
function init(){
window.location = "your website location";
//But if you're planning to not redirect, but on the same website...
document.getElementById("loading_gif").style.display = "none";
//And then load your page here.
}
</script>
</body>
However, if you're asking to check whether another website is loading, you can't do that, because you haven't even started loading the website, and even if you had, I think security would prevent that. You can also use window.onload, which is called when the page loads (you also need to delete the onload="init()" if you are going to use that).
I have three buttons on my website, that link to Facebook, Twitter & vk.com pages. I want to open native app, if it is installed on user device. Otherwise, I want URL fallback to be opened.
First of all, I tried to use native app schemes directly with deep-link.js plugin. But, when I tried to open native app URL scheme, when native app was not installed, Safari has shown an error, but opened URL fallback page finally. Default Android browser said that he does not know how to handle such URL scheme:
<a class="btn btn-primary" href="https://www.facebook.com/warpcompany" data-app-ios="fb://profile/838619192839881" data-app-android="fb://page/838619192839881">Facebook</a>
Then I tried to use App Links "standard", that that has so much promotion from Facebook. I even tried to use their hosted app links, to make sure I've generated everything right way. It does not work, it always redirect to website fallback. You can easily test it by yourself from https://fb.me/746134728830806
Is it possible to provide deep link on website, that will open native app without errors at least in default os browsers, or fallback silently to URL?
It is still possible, but on newer versions of the Android default browser you have to use intents instead of just trying to open the deep link. For example replace your fb://page/838619192839881 with
intent://page/838619192839881#Intent;scheme=fb;package=com.facebook.katana;end
This will fallback to Google play by default, but you can override the fallback adding a S.browser_fallback_url:
intent://page/838619192839881#Intent;scheme=fb;package=com.facebook.katana;S.browser_fallback_url=http%3A%2F%2Fwww.facebook.com%2F;end
The fallback should be url encoded.
Of course you'll have issues if the user is not on an Android phone or with an old version of the default browser (or strange browser). You can setup a bunch of conditions and replace your HTML with the correct code for each case.
The accepted answer will only work on Chrome v28 and default browsers for Android 5.0. If you want this to work on other browser like Facebook/Twitter webviews, Firefox, UC and older default browsers than 5.0, you'll need to use some code that's a little more complicated.
Add this function to your JS snippet:
var openSesame = function() {
var method = 'iframe';
var fallbackFunction = function() {
if (method == 'iframe') {
window.location = "market://details?id=com.facebook.katana";
}
};
var addIFrame = function() {
var iframe = document.createElement("iframe");
iframe.style.border = "none";
iframe.style.width = "1px";
iframe.style.height = "1px";
iframe.src = "fb://page/838619192839881";
document.body.appendChild(iframe);
};
var loadChromeIntent = function() {
method = 'intent';
document.location = "intent://page/838619192839881#Intent;scheme=fb;package=com.facebook.katana;end";
};
if (navigator.userAgent.match(/Chrome/) && !navigator.userAgent.match("Version/")) {
loadChromeIntent();
}
else if (navigator.userAgent.match(/Firefox/)) {
window.location = "fb://page/838619192839881";
}
else {
addIFrame();
}
setTimeout(fallbackFunction, 750);
};
Then your button will look like this:
Open the App
Or you can use a service like branch.io which does exactly what you're looking for automatically.
Yes it is! Have a look to this training:
https://developer.android.com/training/app-indexing/deep-linking.html
Is this the information you needed? lmk
Good day! I am developing a simple mobile app using jQuery Mobile with InAppBrowser plugin on IntelXDK. The purpose of the InAppBrowser is to let users view external web pages within the app. On IntelXDK emulator, the browser closes when I click on "Return to App" button and then it returns to the app. However, I encountered a problem on an Android build when I clicked on the "Done" button I received the message:
Webpage not available
The webpage at file:///android_asset/www/[object%20Event] might be temporarily down...
I have used the following so users can click and view external web pages:
Opening links in external device browser with Cordova/jQuery-mobile
I have modified the above to be used on my app:
$(document).on('click', '.link', function (e) {
var elem = $(this);
var url = elem.attr('href');
if (url.indexOf('http://') !== -1) {
e.preventDefault();
document.addEventListener("deviceready", onDeviceReady, false);
onDeviceReady(url);
//return false;
}
});
function onDeviceReady(url) {
var ref = window.open(url, '_blank', 'location=yes');
}
Thank you for your time and help. I really appreciate it.
The reason why it was displaying an error message because the test file was calling another onDeviceReady function. Problem solved!
I wanted to know the answer to a simple question but i have'nt found a good one
(i've google it for hours :) )
I'm playing with the sl4a with python and i can send events from js to the python script, but the js is not catching the eventPost i put in the code below from python to js.
Anyone knows how is this been done or if there is another way without the registerCallback?
HTML CODE :
<html>
<head>
<script>
var droid = new Android();
function doit(){
droid.makeToast("Text send :=>"+document.getElementById("msg").value);
droid.eventPost("doit",document.getElementById("msg").value);
}
function alert_me(data){
droid.makeToast("All done!");
document.getElementById("msg").value = '';
}
droid.registerCallback("done",alert_me);
</script>
</head>
<body>
<input type="text" name="boton" id="msg" value="" />
<input type="button" name="boton" value="Go!" onclick="javascript:doit()" />
</body>
</html>
PYTHON CODE:
import android,time
if __name__ == '__main__' :
droid = android.Android()
droid.webViewShow("file:///sdcard/sl4a/scripts/sample.html")
while True:
event = droid.eventWait().result
if event["name"] == 'doit':
droid.makeToast("Event catched! %s" % event['data'])
droid.eventPost("done","Done message")
time.sleep(2)
droid.exit()
This is simple to get working, but isn't obvious or well documented.
First you want to get a hook to the Android object inside the webview. Then you can use it to register one or more callbacks. For a simple example, we'll just do one that pops an alert with a message from Python.
var droid = new Android();
droid.registerCallback("echo", function(msg) {
alert(msg.data)
});
In this case, echo is the name of the event type you want this callback to handle. So this will handle 'echo events'. The event names are arbitrary strings, just call them whatever makes sense.
In the Python script that launched the webview, you can now post events to the registered handler whenever you like.
droid.eventPost("echo", "hello world")
The second argument here is the message you want to pass to the JavaScript callback.
Note that although you pass the message back as a string, it arrives in the JavaScript function as an object. That object, we're calling it msg above, has an attribute called data which contains the string you passed from the Python side.
Unfortunately I have never personally been able to get this working, using both registerCallback() and eventWaitFor(). However, if you are still keen on getting this working, I strongly recommend you head on over and download sl4a_r5x – an unofficial but newer and updated release of SL4A. In it is support for using FullScreenUi's based off the same xml code that native Android apps use. With this you can do what you're after and examples can be found on the page.Hopefully this has been helpful and you're still interested in SL4A!