问题
I'm trying to add a TrayIcon inside a Tray that already appears. I'm new in Java so i can be calling wrong methods. Could someone help me please? The code i use is:
if (!SystemTray.isSupported()) {
System.out.println("SystemTray is not supported");
return;
}
final SystemTray tray = SystemTray.getSystemTray();
Image image = Toolkit.getDefaultToolkit().getImage("systemtray.png");
PopupMenu popup = new PopupMenu();
final TrayIcon trayIcon = new TrayIcon(image, "The Tip Text", popup);
trayIcon.setImageAutoSize(true);
try {
tray.add(trayIcon);
} catch (AWTException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ps.: image is in the same package of code.
回答1:
Here's an example. Look to see where you may be going wrong.
Get Image
Image image= ImageIO.read(getClass().getResource("/resources/stackoverflow1.png"));
- File structure
- Complete running program
Here
import java.awt.*;
import java.awt.event.*;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.UIManager;
public class HideToSystemTray extends JFrame {
TrayIcon trayIcon;
SystemTray tray;
HideToSystemTray() throws IOException {
super("SystemTray test");
System.out.println("creating instance");
try {
System.out.println("setting look and feel");
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
System.out.println("Unable to set LookAndFeel");
}
if (SystemTray.isSupported()) {
System.out.println("system tray supported");
tray = SystemTray.getSystemTray();
Image image = ImageIO.read(getClass().getResource("/resources/stackoverflow1.png"));
ActionListener exitListener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println("Exiting....");
System.exit(0);
}
};
PopupMenu popup = new PopupMenu();
MenuItem defaultItem = new MenuItem("Exit");
defaultItem.addActionListener(exitListener);
popup.add(defaultItem);
defaultItem = new MenuItem("Open");
defaultItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setVisible(true);
setExtendedState(JFrame.NORMAL);
}
});
popup.add(defaultItem);
trayIcon = new TrayIcon(image, "SystemTray Demo", popup);
trayIcon.setImageAutoSize(true);
} else {
System.out.println("system tray not supported");
}
addWindowStateListener(new WindowStateListener() {
public void windowStateChanged(WindowEvent e) {
if (e.getNewState() == ICONIFIED) {
try {
tray.add(trayIcon);
setVisible(false);
System.out.println("added to SystemTray");
} catch (AWTException ex) {
System.out.println("unable to add to tray");
}
}
if (e.getNewState() == 7) {
try {
tray.add(trayIcon);
setVisible(false);
System.out.println("added to SystemTray");
} catch (AWTException ex) {
System.out.println("unable to add to system tray");
}
}
if (e.getNewState() == MAXIMIZED_BOTH) {
tray.remove(trayIcon);
setVisible(true);
System.out.println("Tray icon removed");
}
if (e.getNewState() == NORMAL) {
tray.remove(trayIcon);
setVisible(true);
System.out.println("Tray icon removed");
}
}
});
setIconImage(ImageIO.read(getClass().getResource("/resources/stackoverflow1.png")));
setVisible(true);
setSize(300, 200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) throws IOException {
new HideToSystemTray();
}
}
- Result
回答2:
Your code is absolutely fine, probably your Image can't be found. If you're using eclipse it should be located in your project folder.
回答3:
If image cannot be found (as @Leo Pflug noticed your code seems fine), try this little trick I've been using:
// place this class in the same directory as your image
public class Resources {
private Resources() {}
}
// then to obtain Image
Image image = javax.imageio.ImageIO.read(
Resources.class.getResourceAsStream("systemtray.png"));
It will guarantee that Java would search for a systemtray.png
in EXACTLY the same directory as Resources.java
(Resoures.class
) file.
I suspect that Toolkit
searches for it in its own directoery while you placed image in the same directory as your code, and thus the problem.
来源:https://stackoverflow.com/questions/21753252/why-trayicon-doesnt-appear