Develop Reference

system tray icon not displaying on startup of program

I used following code for display system tray icon and message. Startup message and tooltip message is displayed well. But tray icon is not displaying. The icon is in images folder. How can i solve this problem ?
public void systemTray() {
try {
SystemTray tray = SystemTray.getSystemTray();
ImageIcon icon=new ImageIcon(getClass().getResource("/images/Reg Member MO.png"));
Image image = icon.getImage();
TrayIcon icn = new TrayIcon(image, "This is demonstration system tray");
icn.setToolTip("Now you can see system tray\ntooltip here\nThis is demonstration system tray ToolTip");
tray.add(icn);
icn.displayMessage("This is demonstration System Tray message", "You can add some text to\ndisplay here as System Tray Message", TrayIcon.MessageType.INFO);
} catch (AWTException ex) {
Logger.getLogger(StartupSystemTray.class.getName()).log(Level.SEVERE, null, ex);
}
}

May be your icon image is too large than allocated space. Try using public void setImageAutoSize(boolean autosize) method as icn.setImageAutoSize(true). This will re-size the image.

How to set system-tray icon using only AWT

I've created a calculator using AWT Frames. I wanna know how to add a tray-icon to my Cal. I can only use AWT not Swing.

final TrayIcon trayIcon = new TrayIcon(Toolkit.getDefaultToolkit().createImage("pathToImage"));
final SystemTray tray = SystemTray.getSystemTray();
try {
tray.add(trayIcon);
} catch (AWTException e) {
System.out.println("TrayIcon could not be added.");
}
Found at this page http://docs.oracle.com/javase/tutorial/uiswing/misc/systemtray.html
You should also check if SystemTray is supported before using the following snippet
if (!SystemTray.isSupported()) {
System.out.println("SystemTray is not supported");
//..
}
Note that SystemTray is from package java.awt as per your request.

Loading images from jar files (Using Eclipse IDE)

I've got a simple swing application with a JFrame that holds various components. On the JFrame I have a custom toolbar class that extends JPanel. On the JPanel I plan on adding buttons with image icons. My directory structure is as follows:
Project/src/gui (Package holds source files for application)
Project/src/images (Package holds a jar file jlfgr-1_0.jar with button icons and /or individual images files)
The issue is that I want to avoid copying the individual image files to the images package. I'd rather somewhow just load the images directly from the jar file. I've got private method that returns the appropriate icon. This method works, for example if I drag an image file to the images package and call:
button.setIcon(createIcon("/images/Save16.gif"));
private ImageIcon createIcon(String path) {
URL url = getClass().getResource(path);
ImageIcon icon = new ImageIcon(url);
if(url == null) {
System.err.println("Unable to load image: " + path);
}
return icon;
I know this is basic, but how can I get my images directly from the jar file in my current setup?
Thanks.

You can read the image from the stream, thanks to javax.imageio.ImageIO:
private ImageIcon createIcon(String path) {
BufferedImage image = ImageIO.read(getClass().getResourceAsStream(path));
ImageIcon icon = new ImageIcon(image);
return icon;
}

This is another way. The images are at location src/images
BufferedImage myPicture = null;
try {
myPicture = ImageIO.read(this.getClass().getResource("images/Picture2.png"));
} catch (IOException e) {
// TODO Auto-generated catch block
try {
myPicture = ImageIO.read(this.getClass().getResource("images/broken_image.jpg"));
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
JLabel picLabel = new JLabel(new ImageIcon(myPicture));
panel.add(picLabel);

Change System tray Icon in java

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/Graph.png", "tray icon"));
Second try -
Image img = Toolkit.getDefaultToolkit().getImage("images/Graph.png");
final TrayIcon trayIcon = new TrayIcon(img, "Application Name", popup);
The application launches in both cases but no image is shown. Its a blank placeholder. What am i doing wrong ?

images/Graph.png is not a valid URL for an image located in your jar. Hence, I guess that img is null on your second try.
I suggest you this way :
//Get the URL with method class.getResource("/path/to/image.png")
URL url = System.class.getResource("/images/Graph.png");
//Use it to get the image
Image img = Toolkit.getDefaultToolkit().getImage(url);
final TrayIcon trayIcon = new TrayIcon(img, "Application Name", popup);
You shall also ensure that images/ is in your classpath.

The problem is the way you include the image file as the image is inside your . jar, use getResource() or getResourceAsStream, try this:
try {
InputStream inputStream= ClassLoader.getSystemClassLoader().getResourceAsStream("/images/Graph.png");
//or getResourceAsStream("/images/Graph.png"); also returns inputstream
BufferedImage img = ImageIO.read(inputStream);
final TrayIcon trayIcon = new TrayIcon(img, "Application Name", popup);
}
catch (IOException e) {}

For me works in the next way:
// URL: MyProject/src/MyGUI/check.png
// Small icon on secondary taskbar
Image image= ImageIO.read(getClass().getResource("/MyGUI/check.png"));
trayIcon = new TrayIcon(image, "App name", popup);
trayIcon.setImageAutoSize(true);
Results

SystemTray based application without window on Mac OS X

How do I do an application that runs only as a SystemTray TrayIcon on mac os x, (without an awt window and dock icon)?
The code I'm using is this:
public class App
{
public static void main( String[] args )
{
final TrayIcon trayIcon;
if (SystemTray.isSupported()) {
SystemTray tray = SystemTray.getSystemTray();
Image image = Toolkit.getDefaultToolkit().getImage("tray.gif");
trayIcon = new TrayIcon(image, "Tray Demo");
trayIcon.setImageAutoSize(true);
try {
tray.add(trayIcon);
} catch (AWTException e) {
System.err.println("TrayIcon could not be added.");
}
} else {
System.out.println("Tray is not supported");
// System Tray is not supported
}
}
}
The problem is I'm getting a dock icon with title com.cc.ew.App

To prevent icon in dock, you must in <your-app>-Info.plist file add boolean key LSUIElement and set it to YES.
<key>LSUIElement</key>
<true/>