I am developing a Java Desktop application.
Whenever I launch a Java app from command prompt It launches from Left Top corner of the windows screen.
I want to determine like to launch the application from center of the screen like.
How to do this.
If you're using Swing, on your JFrame containing your code use
Note that this will also work on anything else extending from java.awt.Window
JFrame.setLocationRelativeTo(null);
This will set your JFrame relative to nothing, and it appears in the center of the main monitor
Check the documentation on java.awt.Window HERE
Related
Multi-window applications often have a main-window, and all other windows are kind of 'parented' to it. Minimizing such a sub-window will hide its content and show the title-bar at the bottom-left of the screen. Also, these windows do not have their own Icon in the Task-bar, only the main-window does.
How can I make a window being attached this way to another window?
If that is possible, is it also possible without a referenfe to the actual main window?
#2: I'm embedding Java into such an application and I would like to be able to use awt or swing additionally to the native dialogs, which have this behavior by default.
See How to Use Internal Frames.
have look at JInternalFrames for MDI application
read Oracle tutorial, try code example
Summary: make invisible app visible again by clicking desktop icon.
I have created a java desktop application and used Launch4j to create the executable. My application needs to run as a single instance. I have achieved this my checking that option in the Launch4j configuration GUI. When the user clicks the x button on my window (I'm using a JFrame) the window is made invisible. It is NOT disposed. When the user double clicks the system tray icon, the application window is made visible again. When the user double clicks the application desktop icon, and the application is already running, I need my main window to become visible again just like the behavior with the system tray icon.
Launch4j provides an option for a window title under the Single instance tab. I think that this option may be intended for what I need. However, when I set a window title and carry out the steps described above, I get a blank white window. With the blank white window displayed, double clicking my system tray icon will cause my app to appear in the white window. This behavior suggests that maybe changing my code relating to the top level container (Window,Frame,JFrame) might have an effect.
Do you have any ideas on how to incorporate this behavior while still using Launch4j? (it's convenient).
edit:
The core of my question is how do I define what happens when the user double clicks my executable desktop icon? If I could check for an existing instance and redirect the double click to the associated system tray icon, that would be fantastic.
I was able to accomplish my goal. In the Single Instance tab I gave the title of my main JFrame in the field for "Window title". I then added a WindowFocusListener to my main JFrame. When my JFrame receives focus, I check to see if it is already visible. If it is not, I call the appropriate method for displaying my JFrame.
The key observation is that double clicking the exe icon generated by Launch4j fires a window focus event when a window title is given in the setup. I am not sure if that is the only event that is fired, but by listening for that event, I can take whatever actions are necessary from within my java code when the user double clicks the desktop icon.
I have written a swing application in Java and want to display the logo of the application at program start-up for a couple of seconds before the actual program GUI appears. How do you think I can do this in swing?
A built-in Splash-Screen Functionality was added in Java SE 6, take a look here .
You can use SplashScreen: SplashScreen.getSplashScreen().setImageURL(imageURL)
If it does not meet your requirements for some reason you can either create instance of java.awt.Window or javax.swing.JWindow and put image at the middle of the window. Use Timer to disappear this window after specific timeout.
You can also use Frame or JFrame and call its f.setUndecorated(false)
I have specified splash picture in jnlp application
<icon href="starter.png" kind="splash"/>
When I use IE to run the jnlp, the splash window showed up, but my application can't access the splash. I have used the static variable to obtain the instance:
private static SplashScreen splash = SplashScreen.getSplashScreen();
in main(), I first check whether splash is null, and unfortunately, it is null. Then why can I see it for a few seconds? Did Java Web Start window closed it?
If I run application (not jnlp) in Eclipse with vm arguments then I can access the splash screen and update my slow loading process.
How do I access the splash screen using jnlp?
The splash screen as used by web start predates the AWT SplashScreen API & is not compatible with it.
How do I access the splash screen using jnlp?
It cannot be accessed.
..it looks like I have to pop up a window to show the picture.
I'd say that is the only option.
..But that way there is no way to show transparency with the splash screen at least before Java 7, right?
Correct. Given that..
..I mean, I don't want to use the reflection either.
..well, reaching into Sun(/Oracle) private classes is not necessarily 'reflection', I guess that is your worry, and that worry is well founded. Either give up on a partially transparent splash, or wait for Java 7.
But then, gotta' comment, I've never before seen a semi-transparent splash. If a splash is worth showing, why not show it at full opacity?
I Have Create a One Swing Application and I Want To Run My Swing Application In To My Local Web Browser So Plz Tell Me How Can I Do This Because For Applet Program There Is No Any Longer Process For This.
Browsers do not know to run applications. They run applets.
There are 2 ways to refactor you application.
if you wish the application to run in its own window, just write applet that calls YourApplication.main() from its method start()
If you wish to see your application into the browser's window (as a part of your web page) you have to create applet (that extends Pannel), set its layout to BorderLayout and then put the main panel of your application into center of applet. That's it.
If you do not have one panel that contains all elements, e.g. you are adding all elements directly to JFrame you have to fix your application. Create one main panel, add all elements there and put this panel to the center of your JFrame.