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

问题描述

我正在使用JavaFX UI创建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，点击时显示一个窗口，当再次点击时隐藏它，在右键单击显示一个菜单，其中包含1个退出项目

我已经制作了用户界面和把应用程序放在Sys托盘中，但是我无法使用Normal Actionlistener方法显示/隐藏它，但是我收到了这个错误：

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

这里是代码：

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，该代码在 Platform.runLater 。这将执行在JavaFX应用程序线程上与JavaFX系统连接的代码，而不是尝试在Swing事件线程上执行此操作（导致问题的原因）。

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，应用程序将当隐藏最后一个窗口时关闭。要覆盖此默认行为，请调用平台。显示第一个应用程序阶段之前的setImplicitExit（false）。然后，您需要显式调用平台。当你需要应用程序真正关闭时退出（）。

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.

我创建了一个在JavaFX应用程序中使用AWT系统托盘的演示。

这篇关于系统托盘中的JavaFX应用程序的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！