具有不同消息的 Java Swing 工具提示

Question

java

swing 中有什么方法可以显示带有不同消息的工具提示，实际上我正在开发一个应用程序，我必须在系统任务托盘中的工具提示上更新应用程序的当前状态。提前谢谢。

Answer 1

+1 给 Dan 和 Guillaume Polet。只需在trayIcon组件上使用setToolTipText()即可。

我为你做了一个简短的例子。

它将创建一个TrayIcon并将其添加到SystemTray .在ToolTip后TrayIcon将每 5 秒更新一次：

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.MalformedURLException;
import java.net.URL;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
public class SystemTrayExample {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new SystemTrayExample().createAndAddTrayIcon();
            }
        });
    }
    private void createAndAddTrayIcon() {
        try {
            initComponents();
        } catch (MalformedURLException ex) {
            ex.printStackTrace();
        }
    }
    private void initComponents() throws MalformedURLException {
        //Check the SystemTray is supported
        if (!SystemTray.isSupported()) {
            System.out.println("SystemTray is not supported");
            return;
        }
        final PopupMenu popup = new PopupMenu();
        final TrayIcon trayIcon = new TrayIcon(Toolkit.getDefaultToolkit().createImage(new URL("http://docs.oracle.com/javase/tutorial/uiswing/examples/misc/TrayIconDemoProject/src/misc/images/bulb.gif")));
        trayIcon.setToolTip("I am the initial message");
        final SystemTray tray = SystemTray.getSystemTray();
        // Create a pop-up menu components
        MenuItem exitItem = new MenuItem("Exit");
        exitItem.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        });
        //Add components to pop-up menu
        popup.add(exitItem);
        //set popmenu
        trayIcon.setPopupMenu(popup);
        try {
            tray.add(trayIcon);
        } catch (AWTException e) {
            System.out.println("TrayIcon could not be added.");
        }
        int delay = 5000; //milliseconds
        final Timer timer = new Timer(delay, new ActionListener() {
            int count = 1;
            @Override
            public void actionPerformed(ActionEvent evt) {
                System.out.println("Updating on EDT " + (SwingUtilities.isEventDispatchThread() ? "Yes" : "No"));
                if (count == 3) {
                    trayIcon.setToolTip("I am the last message");
                    ((Timer) evt.getSource()).stop();//stop timer
                }
                if (count == 2) {//check if we should change tooltip
                    trayIcon.setToolTip("I am the second message");
                }
                if (count == 1) {
                    trayIcon.setToolTip("I am the  first message");
                }
                count++;
            }
        });
        timer.start();//start timer to change tooltip
    }
}

Answer 2

可以通过调用 setToolTipText() 方法在运行时更改任何JComponent的工具提示。

Answer 3

对于TrayIcon，你有方法trayIcon.setToolTip 。您可以随时调用它，即使在将托盘图标添加到系统托盘后，它也会立即更新。