Monday Aug 03, 2009

JavaFX - YouTube


In previous blog I gave a simple example for JavaFX - JavaScript communication. Here we will see how to utilize this feature so as to integrate YouTube with JavaFX browser deployment. YouTube provides Data and Player APIs. We can utilize them to integrate YouTube presentation layer to JavaFX.

Given below is JavaFX app which uses YouTube Data APIs to search for videos with specified tag and displays the thumbnail images. User can click on thumbnail to view the video. The video can be controlled from JavaFX using JavaScript APIs. I'm sure a good designer can provide a much better seamless integration

<script src="http://dl.javafx.com/1.2/dtfx.js"></script> <script src="/rakeshmenonp/resource/JavaFXYT/JavaFXYT.js"></script>

Click on above image to launch the applet.
Note: Require JavaSE 6 Update 10 or above.
I'm not responsible for content shown in video

I have used YouTube Search APIs. It provides output in various formats - atom, rss, json and json-in-script. I have used the default ATOM format. Even though its using ATOM format, most of required attributes are provided in custom tags as shown below. Hence even though I used AtomTask to parse the feed, I still had to parse the custom tags in onForeignEvent : function(:Event):Void method. Details of parser is available in YTDataTask.fx.

<media:group>
    <media:category label='Science &amp; Technology' scheme='.../categories.cat'>Tech</media:category>
    <media:content url='http://...app=youtube_gdata' type='application/x-shockwave-flash' yt:format='5'/>
    <media:content url='rtsp://rtsp2.youtube.com/.../video.3gp' type='video/3gpp' yt:format='1'/>
    <media:content url='rtsp://rtsp2.youtube.com/.../video.3gp' type='video/3gpp' yt:format='6'/>
    <media:credit role='uploader' scheme='urn:youtube'>terrencebarr</media:credit>
    <media:description type='plain'>Terrence Barr...</media:description>
    <media:keywords>JavaFX, JavaFX Mobile</media:keywords>
    <media:player url='http://www.youtube.com/watch?v=6LdFq8T0Uys'/>
    <media:thumbnail url='http://i.ytimg.com/.../default.jpg' height='90' width='120' time='00:04:25.500'/>
    <media:thumbnail url='http://i.ytimg.com/.../2.jpg' height='90' width='120' time='00:04:25.500'/>
    <media:thumbnail url='http://i.ytimg.com/.../1.jpg' height='90' width='120' time='00:02:12.750'/>
    <media:thumbnail url='http://i.ytimg.com/.../3.jpg' height='90' width='120' time='00:06:38.250'/>
    <media:thumbnail url='http://i.ytimg.com/.../hqdefault.jpg' height='360' width='480'/>
    <media:title type='plain'>Getting Started with JavaFX Mobile...</media:title>
    <yt:aspectRatio>widescreen</yt:aspectRatio>
    <yt:duration seconds='531'/>
    <yt:uploaded>2009-07-28T21:45:00.000Z</yt:uploaded>
    <yt:videoid>6LdFq8T0Uys</yt:videoid>
</media:group>

YouTube provides "Chromeless Player" with JavaScript API support. We can obtain the videoid using above Data APIs and pass this to player using JavaScript APIs. We can perform operations such as - load video, play, pause, stop, seek, mute/un-mute - on video. Refer to JavaScript API documentation for more information.

All these APIs are encapsulated in a file - JavaYT.js. A Java wrapper for this javascript file is provided so as to invoke these APIs from Java - JavaYTUtil.java. This in turn uses JavaScriptUtil.java as shown in previous post.

Both YouTube player and JavaFX is added to a Table so as to render them together. Please refer to JavaFXYT.html for more information.

Try it out and let me know feedback


<script type="text/javascript">var dzone_style = '2';</script> <script language="javascript" src="/rakeshmenonp/resource/JavaFXYT/zoneit.js"></script>

Tuesday Jul 28, 2009

JavaFX - JavaScript Communication


There is a tutorial on JavaFX Script - JavaScript Bridge, JavaFX Sample, Plug-In Live Connect and Carl's blog to list a few.. But still see questions about this (JavaSE Plug-In) feature. Hence just thought about writing a blog to demonstrate this..

I think the question primarily arise because, people have tried it but it doesn't seem to work. The feature is stable only with JavaSE 6 Update 10 and above. So if you are using older JRE (as in default settings of Mac) the feature will not work as expected.

In below example, I have two user interface. One with HTML and another in JavaFX. When I click on HTML buttons it will invoke Java API and show message box using javax.swing.JOptionPane. When I click on JavaFX buttons, it will call JavaScript method such as alert, confirm, prompt to show message box.

<script src="http://dl.javafx.com/1.2/dtfx.js"></script> <script src="/rakeshmenonp/resource/JavaFXJavaScript/JavaFXJavaScript.js"></script>

Click on above image to launch the applet

JavaScript methods are invoked from Java or JavaFX using netscape.javascript.JSObject. An instance of JSObject can be obtained using static method JSObject.getWindow(< applet >) by passing the current applet instance as argument.

Applet instance can be obtained from JavaFX as shown below:

var applet = FX.getArgument("javafx.applet"as Applet;

Next we need to get instance of JSObject. These classes are available in plugin.jar. So we need to include explicitly plugin.jar in classpath. Instead we can also use reflection to invoke these methods. I have used reflection and created a wrapper - JavaScriptUtil. This can be instantiated by passing above applet instance.

A series of method to show message box is added both JavaScript and JavaFX as shown below.

JavaScript:

function show_alert() {
    alert("JS: I am an alert box!");
}

JavaFX:

public function showAlert() : Void {
    JOptionPane.showMessageDialog(null, "FX: I am an alert box!");
}

I have prefixed the message with "FX" and "JS" so as to identify the origin of message box.

Invoke JavaFX method from JavaScript:

var applet = document.getElementById('JavaFXJavaScript');
// Invoke JavaFX method from JavaScript
applet.script.showAlert();

The applet element is obtained using its id

<script>
    javafx(
       {
           codebase: "dist",
           archive: "JavaFXJavaScript.jar",
           draggable: true,
           width: 250,
           height: 120,
           code: "javafxjavascript.Main",
           name: "JavaFXJavaScript",
           id: 'JavaFXJavaScript'
       }
    );
</script>

Invoke JavaScript method from JavaFX:

var jsObject = netscape.javascript.JSObject.getWindow(applet);
jsObject.call("show_alert"[]);

Since we have wrapped all JSObject methods in JavaScriptUtil we may invoke JavaScript method as shown below.

var applet: Applet = FX.getArgument("javafx.applet"as Applet;
var jsObject = new JavaScriptUtil(applet);
jsObject.call("show_alert"[]);

Please refer to JavaFXJavaScript.html and Main.fx for more details.

Java Plug-In LiveConnect API Documentation:

Try it out and let me know feedback


<script type="text/javascript">var dzone_style = '2';</script> <script language="javascript" src="/rakeshmenonp/resource/JavaFXJavaScript/zoneit.js"></script>

About


The views expressed on this blog are my own and do not necessarily reflect that of my organization

Search

Categories
Archives
« April 2014
SunMonTueWedThuFriSat
  
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
   
       
Today