![]() I'd like my program to display an icon in the TaskBar Status Area near the clock in Windows and found a way to do so. The thing is, I'd like my program to stay open in the Status Area if the 'X' is. I just want to change the system tray Icon image for my application. I did 2 things - Just changed the URL in the default program - final TrayIcon trayIcon = new TrayIcon(createImage('images/Gr. The system tray contains one or more tray icons which are added to the tray using the add(java.awt.TrayIcon) method. Adds a tray icon to the system tray. The tray icon becomes visible in the system tray once it is added. Source code, import java.awt.AWTException; import java.awt.Image; import java.awt.SystemTray; import java.awt.Toolkit; import java.awt.TrayIcon; import java.awt.e, JDK 6 And 7, sample, tutorial. C# Application System Tray Icon. Java system tray application with. The following tutorial covers the basics on creating System Tray application in java with an example program. Download Minimize Java Application To System Tray at Minimize Informer: LightScribe System Software, AllToTray, PS Tray Factory. How to Use Icons (The Java. An icon is an object that adheres to the. Icon interface. Swing provides a particularly useful implementation of the Icon interface. Image. Icon, which paints an icon from a GIF, JPEG, or PNG image. Here's a snapshot of an application with three labels, two decorated with an icon: The program uses one image icon to contain and paint the yellow splats. One statement creates the image icon and two more statements include the image icon on each of the two labels. Image. Icon icon = create. Image. Icon(. It finds the specified file and returns an Image. Icon for that file, or null if that file couldn't be found. Here is a typical implementation. Returns an Image. Icon, or null if the path was invalid. The description argument is a string that allows assistive technologies to help a visually impaired user understand what information the icon conveys. Generally, applications provide their own set of images used as part of the application, as is the case with the images used by many of our demos. You should use the Classget. Resource method to obtain the path to the image. This allows the application to verify that the image is available and to provide sensible error handling if it is not. When the image is not part of the application, get. Resource should not be used and the Image. Icon constructor is used directly. With Ubuntu 13.04 the possibility to whitelist (and consequentely blacklist) certain applications from creating a tray icon is gone. Since then the tray icons of Java applications and Wine icons are. For example. Image. Icon icon = new Image. Icon(. If the data location is invalid (but non- null), an Image. Icon is still successfully created; it just has no size and, therefore, paints nothing. As shown in the create. Image. Icon method, it is advisable to first verify that the URL points to an existing file before passing it to the Image. Icon constructor. This allows graceful error handling when the file isn't present. If you want more information while the image is loading, you can register an observer on an image icon by calling its set. Image. Observer method. Under the covers, each image icon uses an. Image object to hold the image data. The rest of this section covers the following topics: Here's an application that uses six image icons. Five of them display thumbnail images and the sixth diplays the full size the photograph. Try this: Click the Launch button to run Icon. Demo using. Java. Or, to compile and run the example yourself, consult the example index. Click any of the thumbnail images to view the full size photographs. Hold the mouse over a photograph. A tool tip appears that displays the photograph caption. Icon. Demo. App demonstrates icons used in the following ways: As a GUI element attached to a button (the thumbnail images on the buttons). To display an image (the five photographs). The photographs are loaded in a separate thread by loadimages. The loadimages code is shown a little later in this section. The Thumbnail. Action class, an inner class in. Icon. Demo. App. java, is a descendant of Abstract. Action that manages our full size image icon, a thumbnail version, and its description. When the action. Performed method is called the full size image is loaded into the main display area. Each button has its own instance of Thumbnail. Action which specifies a different image to show. You might have your class files in a JAR file, or your image files in a JAR file; they might be in the same JAR file, or they might be in different JAR files. The following figures illustrate a few of the ways these files can be configured: If you are writing a real- world application, it is likely (and recommended) that you put your files into a package. For more information on packages, see. Creating and Using Packages in the. Learning the Java Language trail. Here are some possible configurations using a package named . In the example the My. Demo program attempts to load the images/my. Image. png file from the omega class. The class loader looks through the directories and JAR files in the program's class path for /omega/images/my. Image. png. If the class loader finds the file, it returns the URL of the JAR file or directory that contained the file. If another JAR file or directory in the class path contains the images/my. Image. png file, the class loader returns the first instance that contains the file. Here are three ways to specify the class path: Using the - cp or - classpath command- line argument. For example, in the case where the images are in a JAR file named images. My. Demo . For example, here is the JNLP file used by Drag. Picture. Demo. < ? The JAR files are specified using the XML jar tag. Setting the CLASSPATH environment variable. This last approach is not recommended. If CLASSPATH is not set, the current directory (. When we create JAR files for the examples, we keep the same relative locations, although often we put the class files in a different JAR file than the image JAR file. No matter where the class and image files are in the file system — in one JAR file, or in multiple JAR files, in a named package, or in the default package — the same code finds the image files using get. Resource. For more information, see. Accessing Resources in a Location- Independent Manner and the. Application Development Considerations. Applets generally load image data from the computer that served up the applet. The APPLET tag is where you specify information about the images used in the applet. For more information on the APPLET tag see. Using the APPLET Tag. Because the photograph images can be slow to access. Icon. Demo. App. java uses a Swing. Worker to improve the performance of the program as perceived by the user. Background image loading — the program uses a. Swing. Worker object to load each photograph image and compute it's thumbnail in a background thread. Using a Swing. Worker prevents the program from appearing to freeze up while loading and scaling the images. Here's the code to process each image. Swing. Worker class that loads the images a background thread and calls publish. The method places a full size image, thumbnail size image and caption into a Thumbnail. Action object. The Swing. Worker then delivers the Thumbnail. Action to the process method. The process method executes on the event dispatch thread and updates the GUI by adding a button to the toolbar. JButton has a constructor that takes an action object. The action object determines a number of the button's properties. In our case the button icon, the caption and the action to be performed when the button is pressed is all determined by the Thumbnail. Action. Overhead — this program eventually loads all the source images into memory. This may not be desirable in all situations. Loading a number of very large files could cause the program to allocate a very large amount or memory. Care should be taken to manage the number and size of images that are loaded. As with all performance- related issues, this technique is applicable in some situations and not others. Also the technique described here is designed to improve the program's perceived performance, but does not necessarily impact its real performance. The create. Image. Icon method returns null when it cannot find an image, but what should the program do then? One possibility would be to ignore that image and move on. Another option would be to provide some sort of default icon to display when the real one cannot be loaded. Making another call to create. Image. Icon might result in another null so using that is not a good idea. Instead lets create a custom Icon implementation. You can find the implementation of the custom icon class in. Missing. Icon. java. Here are the interesting parts of its code. The . The Graphics object gives the paint. Icon method access to the entire Java. D API. For more information about painting and Java. D, see. Performing Custom Painting. The following code demonstrates how the Missing. Icon class is used in the Swing. Workerdo. In. Background method. Note that Image. Icon is not a descendent of JComponent or even of Component. The API for using image icons falls into these categories: Method or Constructor. Purpose. Image. Icon()Image. Icon(byte. The first argument indicates the source — image, byte array, filename, or URL — from which the image icon's image should be loaded. The source must be in a format supported by the java. Image class: namely GIF, JPEG, or PNG. The second argument, when present, provides a description for the image. The description may also be set via set. Description and provides useful textual information for assistive technologies. Image(Image)Image get. Image()Set or get the image displayed by the image icon. Icon(Component, Graphics, int, int)Paint the image icon's image in the specified graphics context. You would override this only if you're implementing a custom icon that performs its own painting. The Component object is used as an image observer. You can rely on the default behavior provided by Component class, and pass in any component. The two int arguments specify the top- left corner where the icon is painted. URL get. Resource(String)in (java. Class. Loader)Find the resource with the given name. For more information, see Loading Images Using get. Resource. Input. Stream get. Resource. As. Stream(String)in (java. Class. Loader)Find the resource with the given name and return an input stream for reading the resource. For more information, see the Loading Images Into Applets discussion. The following table lists just a few of the many examples that use Image.
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