Develop Reference

Windows disappearing behind a full screen undecorated JFrame

I have a JFrame which I am setting to be full screen like so:
JFrame frame = new JFrame();
frame.setSize(1920, 1080); // Resolution of the monitor
frame.setUndecorated(true);
frame.setVisible(true);
Problem is, any popups (e.g. JDialogs) spawned from this frame open up behind the frame and I can only access them by alt-tabbing to them.
Furthermore, I am running a two monitor setup with each monitor treated as a separate display. If any windows are opened on top of the JFrame, and I move my mouse cursor to the second monitor, the windows disappear behind the JFrame. This is on RHEL 6.4, so perhaps it's a Linux window management issue? It should also be noted that I am running without gnome-panel, so it's a completely bare Linux desktop (no menu bar, no task bar).
Things behave normally when my JFrame is decorated. That is, pop ups open on top of it and windows no longer disappear behind it when I move my mouse cursor to the second monitor.
It's only when I set the JFrame to be undecorated and full screen that windows start getting lost behind it. It's like Linux is "locking" the undecorated JFrame to the monitor. I can't alt-drag it in this state either.
If I set the JFrame to be slightly smaller than the monitor resolution (e.g. 1 pixel smaller), then it is no longer "locked". I can alt-drag it and windows no longer get lost behind it.
Is there any way to prevent windows from getting lost behind the full screen, undecorated JFrame?
I've tried all solutions listed here, but none of them work:
JFrame full screen focusing .
EDIT
The above problem happens when running under Java 7. Running under Java 8 fixes the dialog issue, but the screen crossing issue is still there.

Use the below code to solve the above mentioned issue
public static void setfullscreen(final JFrame frm)
{
frm.dispose();
/**`enter code here`
* Set the Frame as Undecorated
*/
frm.setUndecorated(true);
/**
* set the Frame's resize property as false
*/
frm.setResizable(false);
frm.requestFocus();
/**
* sets the frame as visible
*/
SwingUtilities.invokeLater(new Runnable()
{
#Override
public void run()
{
frm.setVisible(true);
}
}
);
Dimension screenSize =
Toolkit.getDefaultToolkit().getScreenSize();
frm.setBounds(0,0,screenSize.width, screenSize.height);
}
/**
* Close the Full Screen Mode
* #param frm
*/
public static void closeFullScreen(final JFrame frm)
{
frm.dispose();
frm.setUndecorated(false);
/**
* sets the frame as resize
*/
frm.setResizable(true);
/**
* sets the frame as visible
*/
SwingUtilities.invokeLater(new Runnable()
{
#Override
public void run()
{
frm.setVisible(true);
}
}
);
}
</i>

How to control volume in vlcj?

I am creating a project for my college using vlcj. this is my code
public class MediaPlayerUI extends JFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
public static EmbeddedMediaPlayer mediaPlayer;
public static FullScreenStrategy fullScreenStrategy;
public MediaPlayerUI(String title) {
super(title);
// finding native library of vlc player
new NativeDiscovery().discover();
//setting a layout
setLayout(new BorderLayout());
//setting up mediaplayer components
String[] libvlcArgs = {};
MediaPlayerFactory mediaPlayerFactory = new MediaPlayerFactory(libvlcArgs);
mediaPlayer = mediaPlayerFactory.newEmbeddedMediaPlayer(fullScreenStrategy);
//creating swing Components
Canvas canvas = new Canvas();
//setting up the video surface
CanvasVideoSurface videoSurface = mediaPlayerFactory.newVideoSurface(canvas);
mediaPlayer.setVideoSurface(videoSurface);
//adding swing components to contant pane
Container UIContainer = getContentPane();
UIContainer.add(canvas,BorderLayout.CENTER);
}
}
and this
package andromedia;
import javax.swing.JFrame;
import uk.co.caprica.vlcj.player.embedded.DefaultFullScreenStrategy;
public class MainPlayer {
public static void main(String args[])
{
JFrame mainFrame = new MediaPlayerUI("AndroMedia");
mainFrame.setVisible(true);
mainFrame.setSize(500,500);
mainFrame.setDefaultCloseOperation(3);
MediaPlayerUI.fullScreenStrategy = new DefaultFullScreenStrategy(mainFrame);
MediaPlayerUI.mediaPlayer.playMedia("E:\\Media\\flash.mp4","Volume=0");
MediaPlayerUI.mediaPlayer.setVolume(0);
System.out.println(MediaPlayerUI.mediaPlayer.getVolume());
}
}
I cant control the volume
when I print the current volume I get the value "-1"
and am getting the following runtime errors
-1
[000000000d670bd0] main vout display error: Failed to set on top
[000000000d670bd0] main vout display error: Failed to resize display
any help would be greatly appreciated
thank you .

Volume is a bit problematic with recent versions of VLC. In older versions of VLC there was not a problem.
In 2.1, it is simply not possible to set/get the volume before media playback has actually begun. As you have described, you get a value of "-1".
So you have to find some other way, like using a MediaPlayerEventListener and waiting for a media player "playing" event and even then you may need to wait for a little bit longer using e.g. by sleeping for 500ms or so before setting/getting the volume.
Clearly that's a pretty bad solution, but unfortunately that's just the way it is.
With VLC 2.2+, the situation is a little bit better. You can now set/get the volume before playback has actually begun, but if you stop the media player (pause is OK, but not stop) then you can no longer set/get the volume until you play media again.
There is a thread at the VLC forums here with the same conclusions:
https://forum.videolan.org/viewtopic.php?f=32&t=104345
So because of this issue in LibVLC, the same issue appears in vlcj with no perfectly satisfactory solution (at the moment).
In your code, you do this:
mediaPlayer.playMedia(...);
mediaPlayer.setVolume(0);
mediaPlayer.getVolume();
You need to be aware that playMedia actually starts media player asynchronously, so at the point that function returns, and you try to set the volume immediately after, the media is absolutely not guaranteed to have actually started yet and because of this issue you can't set/get the volume yet.
To summarise, there is no ideal solution available to this right now, and it will likely require a change to LibVLC unless you are prepared to live with sub-optimal workarounds.
By the way, those "main vout display error" messages are irrelevant.

Making a custom icon for a JFrame

Well I was wondering if I could make an icon image for a JFrame. I do know its posible, because, let me say, I am NOT digging the java logo.
Well if I just hava to use a Frame object I will.
Can someone tell me, I know its possible!

Use an ImageIcon.
ImageIcon icon = new ImageIcon( pathToIcon );
yourFrame.setIconImage(icon.getImage());
Good Luck!

First, you have to have an image file on your computer. It can be named anything. For this example, we will call this one "pic.jpg".
Next, you need to include it in the files that your application is using. For example, if you're using NetBeans, you simply click on "Files" in the left hand side of the IDE (not File as in the menu, mind you). Drag the picture's file over to the folder that houses the main package. This will include it for available use in the code.
Inside the method where you define the JFrame, you can create an image like this:
Image frameImage = new ImageIcon("pic.jpg").getImage();
You can now set it as the IconImage for the frame like this:
JFrame frame = new JFrame("Title");
frame.setIconImage(frameImage);
Hope that's helpful.
Note: the reason that the Image object has to be created like this is because Image is abstract and cannot be instantiated by saying new Image();
Props to you, btw, kid. I wish I would have started learning programming when I was your age. Keep at it!

You can do the following.
public Test {
public static void main(String[] args) {
JFrame frame = new JFrame("My Frame");
frame.setIconImage(new ImageIcon(Test.class.getResource("image.png"));
frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
frame.setVisible(true);
frame.setSize(100, 100);
//other stuffs....
}
}

Set icon in JFrame

I want to change the icon of the project instead of java icon. When the program icon is being displayed in status bar, it should be displaying the customized icon instead of default java icon.
I am using the following code. Please suggest me what's wrong in this code.
class newframe extends JFrame
{
Container cp;
newframe()
{
cp=this.getContentPane();
cp.setLayout(null);
}
public static void main(String args[])
{
newframe frm= new newframe();
frm.setbounds(0,0,1000,800);
frm.setVisible(true);
ImageIcon im1= new ImageIcon("path upto image");
frm.setIconImage(im1.getImage());
}
}

..new ImageIcon("path upto image");
A frame icon will typically be an embedded-resource, so must be accessed by URL rather than (a String representing a path to) a File.

There are a couple of things that would be keeping it from compiling. First:
frm.setbounds(0,0,1000,800);
Your "setbounds" should have a capital B. Typically, functions will be cased such that the first letter of the first word is lowercased, and subsequent words are upper-cased. See this link for the doc on setBounds: setBounds
There's a second issue in your ImageIcon path. Its hard to say if that came right from your code or if you removed the path for the sake of the example, but Andrew Thompson has addressed that adequately.

I think the problem is the decleration of the imageicon. What you should do is instead of getting the direct path, do something like this:
ImageIcon im1= new ImageIcon("Toolkit.getDefaultToolkit().
getImage(getClass().getResource("path upto image"))");
I do this with all of my applications, and it works every time.

How does NetBeans' Splash Screen feature work?

New to NetBeans and just noticed that in the File >> Project Properties >> Application dialog there is a text field labeled Splash Screen that allows you to specify a path to an image that you would like displayed when your program is launching.
I want to customize the way my splash screen works (adding a progress bar, etc.) and would like to code it from the ground up but don't know where to start. What are the best practices for Java/Swing-based splash screens?
Thanks for any and all input!

The project properties -> Application -> Splash Screen allows you to add an image to an application. This property sets a value in the MANIFEST.MF called SplashScreen-Image: e.g. SplashScreen-Image: META-INF/GlassFish316x159.jpg This property will automatically cause the image to display as a splash screen. It does not work inside NetBeans, and must be run outside the IDE.
There is a tutorial Splash Screen Beginner Tutorial that details how to use it more detail. The tutorial was done for NetBeans 6.8, but will work on 7.2.1 which is the latest at the time of this post.

I'm not sure how NetBeans does it, but Splash Screens are supported by the JRE since version 6. See http://java.sun.com/developer/technicalArticles/J2SE/Desktop/javase6/splashscreen/

Splash screen is just a instance of java.awt.Window or undecorated javax.swing.JFrame.
To create window just say new Window(null), then set size and position (using tookit you can calculate where the screen center is) and then say window.setVisible(true)
Due to this is your own window you can do what you want: set layout, image, add process bar to the SOUTH etc.
You can also use JFrame: new JFrame().setUndecorated(true)`

There are a couple of ways to do this.
To do a simple splash screen (an image) you can specify this in the command line of you java application.
Here is a simple example
java -splash:<file name> <class name>
However, if you want a progress bar, you are going to have to do something a little more complicated, and write some code yourself. This is done in the following way.
Create a JWindow (or Window or undecorated JFrame) component with your splash screen elements
Set it to visible
Do the rest of your Swing GUI startup code
Set your JFrame to visible, then immediately follow with setting the JWindow to visible(false)
This should show the splash almost immediately, and then hide once the your application is fully loaded.
To see some splash screen code, take a look here. The implementation in the link only shows how to achieve what you can with the -splash command, but it will give you a good start to also include the progress bar that you requested.

I hope this helps you, it is a small example of how to create yourself a simple splash screen using a dummy Progress Bar:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class SplashScreen extends JWindow
{
private static JProgressBar progressBar = new JProgressBar();
private static SplashScreen execute;
private static int count;
private static Timer timer1;
public SplashScreen()
{
Container container = getContentPane();
container.setLayout(null);
JPanel panel = new JPanel();
panel.setBorder(new javax.swing.border.EtchedBorder());
panel.setBackground(new Color(255,255,255));
panel.setBounds(10,10,348,150);
panel.setLayout(null);
container.add(panel);
JLabel label = new JLabel("Hello World!");
label.setFont(new Font("Verdana",Font.BOLD,14));
label.setBounds(85,25,280,30);
panel.add(label);
progressBar.setMaximum(50);
progressBar.setBounds(55, 180, 250, 15);
container.add(progressBar);
loadProgressBar();
setSize(370,215);
setLocationRelativeTo(null);
setVisible(true);
}
public void loadProgressBar()
{
ActionListener al = new ActionListener()
{
public void actionPerformed(java.awt.event.ActionEvent evt)
{
count++;
progressBar.setValue(count);
if (count == 50){
timer1.stop();
execute.setVisible(false);
//load the rest of your application
}
}};
timer1 = new Timer(50, al);
timer1.start();
}
public static void main (String args[]){
execute = new SplashScreen();
}
}
Cheers!

Also consider to build your application on top of the NetBeans Platform (a Swing-based RCP). One of the many benefits: it comes with a customizable splash screen with progress bar.
Sample progress bar:
http://platform.netbeans.org/tutorials/nbm-paintapp.html#wrappingUp
Port a Swing application to the NetBeans Platform:
http://platform.netbeans.org/tutorials/60/nbm-porting-basic.html
Further links:
http://netbeans.org/features/platform/index.html
http://netbeans.org/features/platform/all-docs.html

If your application is build using NetBeans Platform, then here's a tutorial about splash screen customisation: http://wiki.netbeans.org/Splash_Screen_Beginner_Tutorial

There is a sample Javafx equivalent of Splash screen. However this splash screen is basically a java swing applet that is called from javafx to be displayed to the user and simulates more or less eclipse and netbeans splash screen using progress bar and titles for the loaded contents. This is the link.
You must be able to get the code and separate out the splash screen code written in java swings and use it for yourself.
This is a custom java swings splash screen. and hence to center the splash screen it uses the traditional
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Dimension labelSize = l.getPreferredSize();
setLocation(screenSize.width / 2 - (labelSize.width / 2),
screenSize.height / 2 - (labelSize.height / 2));