我有一个 ChatServer 应用程序，当 ChatServer 启动时，系统托盘中将显示一个 TrayIcon，当我右键单击该 Trayicon 时，有一个名为 who's online 的菜单，我想在客户端连接聊天服务器时将 MenuItem 添加到此菜单，问题是如何动态添加 MenuItem？我用过
onlineMenu.add(next);
我的 TrayIcon 类如下，（不是整个代码）
public class TrayIconDemo {
private TrayIcon trayIcon ;
private Menu onlineMenu = new Menu("Who's Online(?)");
public void startUp() {
/* Use an appropriate Look and Feel */
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
//UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
} catch (UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
} catch (IllegalAccessException ex) {
ex.printStackTrace();
} catch (InstantiationException ex) {
ex.printStackTrace();
} catch (ClassNotFoundException ex) {
ex.printStackTrace();
}
/* Turn off metal's use of bold fonts */
UIManager.put("swing.boldMetal", Boolean.FALSE);
//Schedule a job for the event-dispatching thread:
//adding TrayIcon.
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
private void createAndShowGUI() {
//Check the SystemTray support
if (!SystemTray.isSupported()) {
System.out.println("SystemTray is not supported");
return;
}
final PopupMenu popup = new PopupMenu();
trayIcon = new TrayIcon(createImage("images/bulb.gif", "tray icon"));
final SystemTray tray = SystemTray.getSystemTray();
// Create a popup menu components
MenuItem aboutItem = new MenuItem("About");
//CheckboxMenuItem cb1 = new CheckboxMenuItem("Set auto size");
//CheckboxMenuItem cb2 = new CheckboxMenuItem("Set tooltip");
// MenuItem errorItem = new MenuItem("Error");
// MenuItem warningItem = new MenuItem("Warning");
MenuItem infoItem = new MenuItem("Info");
// MenuItem noneItem = new MenuItem("None");
MenuItem exitItem = new MenuItem("Exit");
//Add components to popup menu
popup.add(aboutItem);
popup.addSeparator();
// popup.add(cb1);
// popup.add(cb2);
popup.addSeparator();
popup.add(onlineMenu);
//onlineMenu.add("Hi...");
//displayMenu.add(errorItem);
//displayMenu.add(warningItem);
//displayMenu.add(infoItem);
//displayMenu.add(noneItem);
popup.add(exitItem);
trayIcon.setPopupMenu(popup);
trayIcon.setImageAutoSize(true);
trayIcon.setToolTip("Chat Server "+serverIpAddress+"");
try {
tray.add(trayIcon);
} catch (AWTException e) {
System.out.println("TrayIcon could not be added.");
return;
}
//Default Tray notification
trayIcon.displayMessage("Server", "Server Started! server IP is "+serverIpAddress+"",
TrayIcon.MessageType.NONE);
trayIcon.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(null,
"Chat Server Started and Running succesfully.");
}
});
aboutItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(null,
"Chat server version 1.01.Developed by Roshan.");
}
});
/* cb1.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
int cb1Id = e.getStateChange();
if (cb1Id == ItemEvent.SELECTED){
trayIcon.setImageAutoSize(true);
} else {
trayIcon.setImageAutoSize(false);
}
}
});*/
/*cb2.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
int cb2Id = e.getStateChange();
if (cb2Id == ItemEvent.SELECTED){
trayIcon.setToolTip("Chat Server");
} else {
trayIcon.setToolTip(null);
}
}
});*/
ActionListener listener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
MenuItem item = (MenuItem)e.getSource();
//TrayIcon.MessageType type = null;
System.out.println(item.getLabel());
if ("Error".equals(item.getLabel())) {
//type = TrayIcon.MessageType.ERROR;
trayIcon.displayMessage("Chat Server",
"This is an error message", TrayIcon.MessageType.ERROR);
} else if ("Warning".equals(item.getLabel())) {
//type = TrayIcon.MessageType.WARNING;
trayIcon.displayMessage("Sun TrayIcon Demo",
"This is a warning message", TrayIcon.MessageType.WARNING);
} else if ("Info".equals(item.getLabel())) {
//type = TrayIcon.MessageType.INFO;
trayIcon.displayMessage("Sun TrayIcon Demo",
"This is an info message", TrayIcon.MessageType.INFO);
} else if ("None".equals(item.getLabel())) {
//type = TrayIcon.MessageType.NONE;
trayIcon.displayMessage("Sun TrayIcon Demo",
"This is an ordinary message", TrayIcon.MessageType.NONE);
}
}
};
//errorItem.addActionListener(listener);
//warningItem.addActionListener(listener);
infoItem.addActionListener(listener);
//noneItem.addActionListener(listener);
exitItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
tray.remove(trayIcon);
System.exit(0);
}
});
}
现在在这里我想向 onlineMenu 添加一个 menuItem 当客户端连接到服务器时将调用此方法
public void setClientIpName(String ipNameClient){//receiving ipNameClient veriable inside ip+com_name
String[] token =ipNameClient.split("/"); //token[1]=ip , token[2]=computer name
this.addClient(token[2]);//send name nad return treeset
if(!clients.isEmpty()){
JOptionPane.showMessageDialog(null,clients.size()+"");
Iterator iterator;
iterator = clients.iterator();
while (iterator.hasNext()){
String next = iterator.next()+"";
onlineMenu.add(next);
}
}
}
但它想将任何 MenuItem 添加到 onlineMenu ，有人可以帮忙吗？