在系统托盘中添加 JFar，单击十字而不是在最小化按钮的情况下

Question

frame.addWindowStateListener(new WindowStateListener() {
    @Override
    public void windowStateChanged(WindowEvent e) {
        if (e.getNewState() == ICONIFIED) {
            try {
                tray.add(trayIcon);
                frameLogin.setVisible(false);
            } catch (AWTException ex) {
            }
        }
    }
});

这将在系统托盘中添加我的应用程序，

但我想在用户单击十字而不是最小化的情况下将我的应用程序添加到系统托盘中

Answer 1

正如@mKorbel所说，WindowListener + DefaultCloseOperation对我来说很好用：

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
public final class SystemTrayTest {
  public static void main(String... args) {
    EventQueue.invokeLater(new Runnable() {
      @Override public void run() {
        createAndShowGUI();
      }
    });
  }
  public static void createAndShowGUI() {
    final JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(WindowConstants.HIDE_ON_CLOSE);
    frame.setResizable(false);
    frame.setSize(320, 240);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
    if (!SystemTray.isSupported()) {
      frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
      return;
    }
    final SystemTray tray = SystemTray.getSystemTray();
    BufferedImage i= new BufferedImage(16, 16, BufferedImage.TYPE_INT_ARGB);
    Graphics2D g = i.createGraphics();
    g.setColor(Color.RED);
    g.fillRect(2, 2, 12, 12);
    g.dispose();
    final PopupMenu popup = new PopupMenu();
    final TrayIcon icon   = new TrayIcon(i, "TRAY", popup);
    Handler h = new Handler(tray, icon);
    frame.addWindowStateListener(h);
    frame.addWindowListener(h);
    MenuItem item1 = new MenuItem("OPEN");
    item1.addActionListener(new ActionListener() {
      @Override public void actionPerformed(ActionEvent e) {
        frame.setVisible(true);
        tray.remove(icon);
      }
    });
    MenuItem item2 = new MenuItem("EXIT");
    item2.addActionListener(new ActionListener() {
      @Override public void actionPerformed(ActionEvent e) {
        tray.remove(icon);
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.dispose();
        //System.exit(0);
      }
    });
    popup.add(item1);
    popup.add(item2);
  }
}
class Handler extends WindowAdapter {
  private final SystemTray tray;
  private final TrayIcon icon;
  public Handler(SystemTray tray, TrayIcon icon) {
    super();
    this.tray = tray;
    this.icon = icon;
  }
  private void addTrayIconDisposeFrame(JFrame frame) {
    try {
      tray.add(icon);
      frame.dispose();
      //frame.setVisible(false);
    } catch (AWTException ex) {
      ex.printStackTrace();
    }
  }
  @Override public void windowStateChanged(WindowEvent e) {
    System.out.println("ICONIFIED");
    if (e.getNewState() == Frame.ICONIFIED) {
      addTrayIconDisposeFrame((JFrame) e.getSource());
    }
  }
  @Override public void windowClosing(WindowEvent e) {
    System.out.println("windowClosing");
    addTrayIconDisposeFrame((JFrame) e.getSource());
  }
}