javafx中关闭窗口，不出发窗口关闭事件（Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Not on FX application thread; cur）

1. 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：

• 有一个系统托盘图标，点击后会显示一个窗口，再次点击时会隐藏它，右键单击显示一个菜单，其中包含1＆＃34;退出＆＃34;项目

我已经制作了用户界面并将应用程序放入了Sys托盘，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：

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

代码如下：

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 
                    // 这个地方出问题了
                    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");
          } 
        //
    }
}

2. 解决方法：

将代码包装在actionListener中，该代码在Platform.runLater中回调到JavaFX。这将执行与JavaFX应用程序线程上的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（导致问题的原因）。

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shutdown when it's last window is hidden。要覆盖此默认行为，请在显示第一个应用程序阶段之前调用Platform.setImplicitExit(false)。然后，当您需要应用程序真正关闭时，您需要显式调用Platform.exit()。

3. 完整代码

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 
                    // 解决问题
                    Platform.runLater(new Runnable() {
                       @Override public void run() {
                            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");
          } 
        //
    }
}

注意：本文归作者所有，未经作者允许，不得转载