Develop Reference

How to get javafx webview url

I am trying to make a web browser with javafx, but I need to get the url of the website that the user is on. I tryed using getDocument(), but that didn't work, and there's no getUrl() method. Will you tell me how I can accomplish this.

Just to add onto Zephyr's answer I would like to give you the code you need:
browserName.getEngine().load("https://www." + urlFieldName.getText());
urlFieldName.setText(browserName.getEngine().getLocation());

IndexedDB work in Android native app

We've got application to view some specific materials. Among material types there is HTML5 presentation that is shown in WebView widget inside app. And now we need to get detailed information about this view (for example slide show duration, list element pick where it is available, etc).
It is what customer wants - we can't change it.
We decided to use IndexedDB inside HTML5 to store information locally. Now storing works (as I know :) ). Next problem is to get this information by app and it is not solved yet. Unfortunately google didn't help me.
How to get information from IndexedDB file if I know its path? Or do you know another way to transfer data from html to native app?
P.S. Writing custom browser could not be solution.
Update
Found solution to load file from JS. In chrome browser it automatically saves in downloads. In android app I'm setting to WebView object DownloadListener to listen file save event.
Catching save file works perfect. But the url path is looks like blob:file/... and I can't get info from it. Tried using ContentResolver, create File object, replace blob: string with nothing, start ACTION_VIEW intent - nothing helped.
Update
Tried to use DownloadManager and DownloadManager.Request - it throws following exception
java.lang.IllegalArgumentException: Can only download HTTP/HTTPS URIs: file:///fa4857ad-0e86-454a-a341-123729e9ece0
Same with blob:file uri.

Is it a requirement to use IndexedDB for communication?
If not, you could add a javascript interface. Simply pass on the data as JSON string and then decode it on the java side.
https://developer.android.com/guide/webapps/webview.html#BindingJavaScript
Mind security (don't allow the user to browse to different pages, sanitize incoming data, ...) ;-)

You can solve the problem by hack by calling the JavaScript function from Java and returning the required attributes in specific pattern. To implement this
Create the javascript function which will return the attributes in
specific pattern.
Create the WebChromClient and override onJsAlert() method. message
parameter of onJsAlert has the returned string of message. Parse the
message string to get the required attributes.
Call the JavaScript function from Java code to get the value.
final class MyWebChromeClient extends WebChromeClient {
#Override
public boolean onJsAlert(WebView view, String url, String message, JsResult result) {
result.confirm();
// Parse the message to get the required attributes
Toast.makeText(MainActivity.this, message, Toast.LENGTH_LONG).show();
return true;
}
}
To call the JavaScript function to get the data use the below code. Here testFunction() is the fucntion which will return the data in string format.
webView.loadUrl("javascript:alert(testFunction())");
Create the instance of WebChromeClient and set in webview and also don't forget to enable the JavaScript.
WebView webView = (WebView)findViewById(R.id.web_view);
webView.getSettings().setJavaScriptEnabled(true);
webView.setWebChromeClient(new MyWebChromeClient());

We decided to use ServerSocket for localhost as web server on device. And then Html sends to it http responce. May be using java script binding as wrote #Michael2 whould be better, but our solution was realized before his post. :-)

Android - Get a contact's Facebook picture

Android platform is really fun to work with especially when it comes to resolving issues. Indeed, there is possibly everything there is to know about Android development on the internet.
Alright, I've been searching for about a week and haven't found anything that was close from working. Let's dive into it.
We are building an Android Application that requires a read/write access to existing Contacts on a device. It has become really easy to read a contact's set photo using this method :
// Returns a stream reading a contact thumbnail
public InputStream getContactThumbnail(int id) {
// Stream reading contact image
InputStream stream = ContactsContract.Contacts.openContactPhotoInputStream(
context.getContentResolver(),
ContentUris.withAppendedId(
ContactsContract.Contacts.CONTENT_URI, id
)
);
// If image is null, try to read Facebook image
if (stream == null) {
stream = new ByteArrayInputStream(getFacebookPhoto(id));
}
return stream;
}
Now, the previous method receives an id as a parameter and returns a Stream making it possible to read the contact's thumbnail. It is needed to be a stream because the phone acts like a web server and has multiple threads running. If a thumbnail is requested several times in the same short time lapse, an OutOfMemoryException will be thrown for sure.
I need to correctly implement the getFacebookPhoto(int) method so that it returns whatever stream reading the Facebook profile picture of a contact that has his or her contact linked with his or her respective Facebook profile. I've tried and failed so many times.
Hypothesis #1
If a contact is linked with a Facebook profile, it has to have the Facebook ID saved somewhere. If this information is accessible, it would make it easy to get a Facebook profile picture using graph. Problem is an internet connection is needed to do so.
Hypothesis #2
Facebook thumbnails are saved somewhere on the SD card. Maybe there's a link between a Contact and those files that can be found through an SQLite request?
Hypothesis #3
sigh, I look desperate. Okay, if I understood correctly, a phone Contact and a Facebook Contact are not the same things in the database. If you query all the contacts from the following URI :
*ContactsContract.Contacts.CONTENT_URI*
you only get contacts that you created and nothing regarding Facebook links. Is there a way to find all linked contacts and get their respective photos?
Conclusion
Yeah, that's about is. To sum it up, I need to read all contacts information. For each contact, I have to find its photo. If the user has not set a picture to a contact that is linked to a Facebook profile, the profile picture which it was linked too must be read.
Up until now, the StackOverflow community has been of a great help and saved my life and job countless times. It is possible, I've seen it in other apps.
Thank you for spending of your time, it is truly appreciated.
EDIT
Let's not give up! I will start a 100pts bounty as soon as I can.

Your hypothesises are right to a certain extend. In contact application this things are handled as folows -
Device's Contact & its Facebook account are mapped by Contact's _ID & Facebook's id, this is one-to-one mapping. So from this mapping first you have to find out the Facebook id
of the conserned contact. But in which table this info is stored & wheather that table is eposed to you or not, URL to that table completely dependent on vendors.
From Facebook Id we can get corresponding profile image either from Facebook's server or from Media DB, if it is also cached in.
But this is not supported by all OEMs. And implementation varies from OEM to OEM as Google don't enforce for any common standard implementation of it.
So there is no garantee that a single implementation will work for all devices from different OEMs.

You should really go and play around with Graph Explorer on the Facebook Developers site it will help you a lot in figuring out what you need to do to get certain things. In order to get the picture for an person you just have to do is do a simple GET HTTPRequest with the graph path of /ID?fields=picture (where ID is the facebook id of the contact) which will return a JSON object that contains the link to that person's profile picture. From there it should be fairly simple for you to get the image.
You can also do the same thing to get all of a person's friends with the picture information by sending a GET request to /me/friends?fields=picture. It seems like you are trying to avoid a web connection but if the android contacts do not store the facebook id then you will have to get the ids yourself I'm afraid.
Hope that helps.

Why don't you use FQL, for Android you can use -
String query = "SELECT uid, name, pic, pic_small, pic_big FROM user WHERE uid IN (SELECT uid2 FROM friend WHERE uid1 = me())";
Bundle params = new Bundle();
params.putString("method", "fql.query");
params.putString("query", query);
mAsyncFacebookRunner.request(null, params, new CustomRequestListener());
where CustomRequestListener() extends RequestListener in the Facebook Android SDK.

YouTubeEmbededPlayer GWT HowTo stop videos?

I am trying to use the youtube video gwt api.
The youtube-player works but how can I stop videos? I didnt find a command for that...
I created my player following:
protected YouTubeEmbeddedPlayer _youTubeEmbeddedPlayer;
_youTubeEmbeddedPlayer = new YouTubeEmbeddedPlayer(youTubeVideoID);
That´s the YouTube Player:
https://code.google.com/p/gwt-youtube-api/wiki/EmbededPlayer

By using YouTubePlayerWrapper.
You can stop video by calling the method
youTubePlayerWrapper.stopVideo();

This answer may not resolve the problem mentioned with the same library. In fact I tried multiple different library with every library having some issues. So end up creating my own wrapper. I have made it public check it if you can use it https://github.com/pandurangpatil/gwt-youtube

Android: custom Facebook integration

I need some advice for this matter...
I used the facebook android sdk to create an integration with facebook from my application...I followed this tutorial:
http://www.integratingstuff.com/2010/10/14/integrating-facebook-into-an-android-application/
I would need to implement authentication in one activity and the function postToWall in another.... after authentication i want to send post simply by pressing a button but in other activity, different from that where i do authentication.
is it possible? or with the SDK I'm forced to do everything together in the same activity?
thanks in advance

Yes it is possible. You will get a access token which you can send to the next activity. Use getAccessToken() and setAccessToken().
Here is an example that even saves the needed data: Contact-Picture-Sync

you need to install an extension, similar to the core Android SDK, but no, here is what you need to do:
1.) go to github.com/facebook/facebook-android-sdk
2.) download the facebook directory ONLY! The other directories are only examples.
3.) Put the files from the src (you can copy the drawables too, if you want to) in the package, you are currently working with
4.) You are good to go, you can use the facebook "SDK"
see also this example https://github.com/facebook/facebook-android-sdk/tree/master/examples/Hackbook download it , it is working example provided by facebook

just to provide an alternative answer, there's other ways of implementing sharing on Android.
It allows for more sharing options (like Twitter, QR-Barcodes, blogging and whatnot) without having to deal with the facebook android sdk.
What you would use is a "share" intent, like so:
String title = "My thing"; // used if you share through email or channels that require a headline for the content, always include this or some apps might not parse the content right
String wallPost = "Hey - check out this stuff: http://link.com "; // the content of your wallpost
String shareVia = "Share this stuff via"; // the headline for your chooser, where the phones avaliable sharing mechanisms are offered.
Intent shareIntent = new Intent(android.content.Intent.ACTION_SEND);
shareIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
shareIntent.setType("text/plain");
shareIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, title);
shareIntent.putExtra(android.content.Intent.EXTRA_TEXT, wallPost);
startActivity(Intent.createChooser(shareIntent, shareVia));
This is by far the preferred solution on Android if you're looking for simple sharing, as it makes your app future-compatible with new services. And more lean and flexible for the user too, as there's little to no friction from hitting the share button to posting content.
It can also be seen in this blog post: http://android-developers.blogspot.com/2012/02/share-with-intents.html
I hope you can use this for your project.