系统托盘中的 JavaFX 应用 [英] JavaFX app in System Tray

问题描述

我正在使用 JavaFX UI 制作一个简单的应用程序，该应用程序只是这样做:

I am Making a Simple App using JavaFX UI, The app simply just do that:

• 有一个系统托盘图标，单击时显示一个窗口，再次单击时隐藏它，右键单击时显示一个带有 1 个退出"项的菜单

我已经制作了 UI 并将应用程序放入系统托盘中，但我无法使用普通 Actionlistener 方法显示/隐藏它，但出现此错误:

I already Made the UI and put the App in the Sys Tray, but i can't show/hide it using Normal Actionlistener method, but i got this error:

Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Not on FX application thread; currentThread = AWT-EventQueue-0

这是代码:

import java.awt.Image;
import java.awt.MenuItem;
import java.awt.PopupMenu;
import java.awt.SystemTray;
import java.awt.Toolkit;
import java.awt.TrayIcon;
import java.awt.event.ActionListener;


import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class Main extends Application{
    public static void main(String[] args) { 
        launch(args);       
    }

    @Override
    public void start(final Stage primaryStage) {
        primaryStage.setTitle("Hello World!");
        Button btn = new Button();
        btn.setText("Say 'Hello World'");
        btn.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent event) {
                System.out.println("Hello World!");            }
        });

        StackPane root = new StackPane();
        root.getChildren().add(btn);
        primaryStage.setScene(new Scene(root, 300, 250));
        primaryStage.show();

        if (SystemTray.isSupported()) {         
            SystemTray tray = SystemTray.getSystemTray();
            Image image = Toolkit.getDefaultToolkit().getImage("Germany-politcal-map.jpg");
            PopupMenu popup = new PopupMenu();
            MenuItem item = new MenuItem("Exit");

            popup.add(item);

            TrayIcon trayIcon = new TrayIcon(image, "Amr_Trial", popup);

            ActionListener listener = new ActionListener() {                
                @Override
                public void actionPerformed(java.awt.event.ActionEvent arg0) {
                    // TODO Auto-generated method stub
                    System.exit(0);                 
                }               
            };                       

            ActionListener listenerTray = new ActionListener() {                
                @Override
                public void actionPerformed(java.awt.event.ActionEvent arg0) {
                    // TODO Auto-generated method stub                  
                    primaryStage.hide();
                }                   
            };            

            trayIcon.addActionListener(listenerTray);
            item.addActionListener(listener);

            try{
              tray.add(trayIcon);
            }catch (Exception e) {
              System.err.println("Can't add to tray");
            }
          } else {
            System.err.println("Tray unavailable");
          } 
        //
    }
}

推荐答案

将代码包装在 actionListener 中，它在 Platform.runLater.这将在 JavaFX 应用程序线程上执行与 JavaFX 系统接口的代码，而不是尝试在 Swing 事件线程上执行此操作(这就是导致您出现问题的原因).

Wrap the code in the actionListener which calls back to JavaFX in Platform.runLater. This will execute the code which interfaces with the JavaFX system on the JavaFX application thread rather than trying to do it on the Swing event thread (which is what is causing you issues).

例如:

ActionListener listenerTray = new ActionListener() {                
  @Override public void actionPerformed(java.awt.event.ActionEvent event) {
    Platform.runLater(new Runnable() {
      @Override public void run() {
        primaryStage.hide();
      }
    });
  }                   
};            

默认情况下，应用程序将 当它的最后一个窗口被隐藏时关闭.要覆盖此默认行为，请调用 Platform.setImplicitExit(false) 在显示第一个应用程序阶段之前.然后，您需要显式调用 Platform.exit() 当您需要应用程序真正关闭时.

By default the application will shutdown when it's last window is hidden. To override this default behaviour, invoke Platform.setImplicitExit(false) before you show the first application Stage. You will then need to explicitly call Platform.exit() when you need the application to really shutdown.

我创建了一个演示，用于在 JavaFX 应用程序中使用 AWT 系统托盘.

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