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How to open a JavaFX Window only once time

I have a JavaFX application and I need simple to avoid user from opening the same window inside the application more than once.
I tried to find some solution, but nothing get applicable.
As a sample... I have a window that give me payments options, its not a modal, it's a new stage. While I click the button to open that window, it's open, doesn't matter if there is another instance of this same stage running, simple open new windows every click. I want to avoid this. Like switch to the already opened stage window when click the button, or simply miss the click if that window is already opened.

You just need to keep track of the stage and only open a new one if its not already shown. You could also choose to disable the Button if the new window is showing, but I prefer to have the new window simply brought back in front so the user knows it's there.
You can do this by creating a reference to your Stage and then checking if it is null or showing within the button's event handler.
Here is an MCVE to demonstrate:
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class Main extends Application {
/**
* Reference to the new Window that will allow only one instance at a time.
*/
private Stage newWindowStage;
public static void main(String[] args) {
launch(args);
}
#Override
public void start(Stage primaryStage) {
VBox root = new VBox(5);
root.setAlignment(Pos.CENTER);
root.setPadding(new Insets(10));
Button openWindow = new Button("Open Window");
// **********************************************************************************************
// Set the button to open the new Window Stage
// **********************************************************************************************
openWindow.setOnAction(event -> {
// **********************************************************************************************
// Check if the Stage is already showing.
// **********************************************************************************************
if (newWindowStage == null || !newWindowStage.isShowing()) {
// **********************************************************************************************
// The new window is not currently open, so create/show it
// **********************************************************************************************
newWindowStage = new Stage();
newWindowStage.setWidth(300);
newWindowStage.setHeight(300);
newWindowStage.setScene(new Scene(
new VBox(
new Label("New Window!")
)
));
newWindowStage.show();
} else {
// **********************************************************************************************
// The window is already open, so bring it to the front of focus
// **********************************************************************************************
newWindowStage.toFront();
}
});
root.getChildren().add(openWindow);
primaryStage.setScene(new Scene(root));
primaryStage.setWidth(200);
primaryStage.setHeight(200);
primaryStage.setTitle("Test Application");
primaryStage.show();
}
}

JavaFX equivalent of Taskbar in Swing [duplicate]

I am Making a Simple App using JavaFX UI, The app simply just do that:
has a systray icon, which when clicked shows a window, when clicked again hides it, on rightclick shows a menu with 1 "exit" item
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
here is the Code:
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");
}
//
}
}

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).
For example:
ActionListener listenerTray = new ActionListener() {
#Override public void actionPerformed(java.awt.event.ActionEvent event) {
Platform.runLater(new Runnable() {
#Override public void run() {
primaryStage.hide();
}
});
}
};
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.
I created a demo for using the AWT system tray within a JavaFX application.

You should only modify the javafx classes on the javafx thread, the listeners on the tray icon are likely to be running on the swing thread. You can do this by posting a runnable to Platform#runLater like so:
Platform.runLater(new Runnable() {
public void run() {
primaryStage.hide();
}
});

The system tray is not supported in JavaFX yet. You could track the progress on this task under the following JIRA issue: https://bugs.openjdk.java.net/browse/JDK-8090475
The issue also provides a workaround, which could be used in JavaFX 8 to get the basic support.
The feature is not planned for JavaFX 8, so it might be released in one of the following updates or even in JavaFX 9.

Shameless self-plug, but I developed a small wrapper library for JavaFX icons that use the SystemTray called FXTrayIcon.
It abstracts away all of the nasty AWT bits and eliminates having to guess which thread you should be running code on. It's available as a dependency on Maven Central.

I resolved your issue. JavaFX with AWT. I have one example of a application that shows and hides when you make left clic. i really hope works for you
import java.awt.AWTException;
import java.awt.Image;
import java.awt.SystemTray;
import java.awt.Toolkit;
import java.awt.TrayIcon;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.net.URL;
import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.application.Platform;
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 MainApp2 extends Application {
int stateWindow = 1;
#Override
public void start(final Stage stage) throws Exception {
//Check the SystemTray is supported
if (!SystemTray.isSupported()) {
System.out.println("SystemTray is not supported");
return;
}
URL url = System.class.getResource("/image/yourImage.png");
Image image = Toolkit.getDefaultToolkit().getImage(url);
//image dimensions must be 16x16 on windows, works for me
final TrayIcon trayIcon = new TrayIcon(image, "application name");
final SystemTray tray = SystemTray.getSystemTray();
//Listener left clic XD
trayIcon.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent event) {
if (event.getButton() == MouseEvent.BUTTON1) {
Platform.runLater(new Runnable() {
#Override
public void run() {
if (stateWindow == 1) {
stage.hide();
stateWindow = 0;
} else if (stateWindow == 0) {
stage.show();
stateWindow = 1;
}
}
});
}
}
});
try {
tray.add(trayIcon);
} catch (AWTException e) {
System.out.println("TrayIcon could not be added.");
}
stage.setTitle("Hello man!");
Button btn = new Button();
btn.setText("Say 'Hello man'");
btn.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent event) {
System.out.println("Hello man!");
}
});
StackPane root = new StackPane();
root.getChildren().add(btn);
stage.setScene(new Scene(root, 300, 250));
Platform.setImplicitExit(false);
stage.show();
}
/**
* The main() method is ignored in correctly deployed JavaFX application.
* main() serves only as fallback in case the application can not be
* launched through deployment artifacts, e.g., in IDEs with limited FX
* support. NetBeans ignores main().
*
* #param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}

Creating tray icon using JavaFX

I want to write a tray icon via JavaFx, but I only find that can write by awt.
Is there any way that can write it use JavaFx?
It will look like these tray icons from Windows 10:

If this is to be believed, JavaFX will feature tray icons in a future update. Till then stick to AWT. Keep track of the development using this thread on the JDK bug system. Hope this helps.

If you'd prefer to not use AWT directly, I've created a small project FXTrayIcon which translates JavaFX MenuItems to AWT MenuItems and abstracts away all of the ugly AWT bits. It's at least a small help until JavaFX supports this natively.
See it on my GitHub page

You can't with pure JavaFX, but you can use AWT with JavaFX:
import javafx.application.*;
import javafx.geometry.Pos;
import javafx.scene.*;
import javafx.scene.control.Label;
import javafx.scene.layout.*;
import javafx.scene.paint.Color;
import javafx.stage.*;
import javax.imageio.ImageIO;
import java.io.IOException;
import java.net.URL;
import java.text.*;
import java.util.*;
// Java 8 code
public class JavaFXTrayIconSample extends Application {
// one icon location is shared between the application tray icon and task bar icon.
// you could also use multiple icons to allow for clean display of tray icons on hi-dpi devices.
private static final String iconImageLoc =
"http://icons.iconarchive.com/icons/scafer31000/bubble-circle-3/16/GameCenter-icon.png";
// application stage is stored so that it can be shown and hidden based on system tray icon operations.
private Stage stage;
// a timer allowing the tray icon to provide a periodic notification event.
private Timer notificationTimer = new Timer();
// format used to display the current time in a tray icon notification.
private DateFormat timeFormat = SimpleDateFormat.getTimeInstance();
// sets up the javafx application.
// a tray icon is setup for the icon, but the main stage remains invisible until the user
// interacts with the tray icon.
#Override public void start(final Stage stage) {
// stores a reference to the stage.
this.stage = stage;
// instructs the javafx system not to exit implicitly when the last application window is shut.
Platform.setImplicitExit(false);
// sets up the tray icon (using awt code run on the swing thread).
javax.swing.SwingUtilities.invokeLater(this::addAppToTray);
// out stage will be translucent, so give it a transparent style.
stage.initStyle(StageStyle.TRANSPARENT);
// create the layout for the javafx stage.
StackPane layout = new StackPane(createContent());
layout.setStyle(
"-fx-background-color: rgba(255, 255, 255, 0.5);"
);
layout.setPrefSize(300, 200);
// this dummy app just hides itself when the app screen is clicked.
// a real app might have some interactive UI and a separate icon which hides the app window.
layout.setOnMouseClicked(event -> stage.hide());
// a scene with a transparent fill is necessary to implement the translucent app window.
Scene scene = new Scene(layout);
scene.setFill(Color.TRANSPARENT);
stage.setScene(scene);
}
/**
* For this dummy app, the (JavaFX scenegraph) content, just says "hello, world".
* A real app, might load an FXML or something like that.
*
* #return the main window application content.
*/
private Node createContent() {
Label hello = new Label("hello, world");
hello.setStyle("-fx-font-size: 40px; -fx-text-fill: forestgreen;");
Label instructions = new Label("(click to hide)");
instructions.setStyle("-fx-font-size: 12px; -fx-text-fill: orange;");
VBox content = new VBox(10, hello, instructions);
content.setAlignment(Pos.CENTER);
return content;
}
/**
* Sets up a system tray icon for the application.
*/
private void addAppToTray() {
try {
// ensure awt toolkit is initialized.
java.awt.Toolkit.getDefaultToolkit();
// app requires system tray support, just exit if there is no support.
if (!java.awt.SystemTray.isSupported()) {
System.out.println("No system tray support, application exiting.");
Platform.exit();
}
// set up a system tray icon.
java.awt.SystemTray tray = java.awt.SystemTray.getSystemTray();
URL imageLoc = new URL(
iconImageLoc
);
java.awt.Image image = ImageIO.read(imageLoc);
java.awt.TrayIcon trayIcon = new java.awt.TrayIcon(image);
// if the user double-clicks on the tray icon, show the main app stage.
trayIcon.addActionListener(event -> Platform.runLater(this::showStage));
// if the user selects the default menu item (which includes the app name),
// show the main app stage.
java.awt.MenuItem openItem = new java.awt.MenuItem("hello, world");
openItem.addActionListener(event -> Platform.runLater(this::showStage));
// the convention for tray icons seems to be to set the default icon for opening
// the application stage in a bold font.
java.awt.Font defaultFont = java.awt.Font.decode(null);
java.awt.Font boldFont = defaultFont.deriveFont(java.awt.Font.BOLD);
openItem.setFont(boldFont);
// to really exit the application, the user must go to the system tray icon
// and select the exit option, this will shutdown JavaFX and remove the
// tray icon (removing the tray icon will also shut down AWT).
java.awt.MenuItem exitItem = new java.awt.MenuItem("Exit");
exitItem.addActionListener(event -> {
notificationTimer.cancel();
Platform.exit();
tray.remove(trayIcon);
});
// setup the popup menu for the application.
final java.awt.PopupMenu popup = new java.awt.PopupMenu();
popup.add(openItem);
popup.addSeparator();
popup.add(exitItem);
trayIcon.setPopupMenu(popup);
// create a timer which periodically displays a notification message.
notificationTimer.schedule(
new TimerTask() {
#Override
public void run() {
javax.swing.SwingUtilities.invokeLater(() ->
trayIcon.displayMessage(
"hello",
"The time is now " + timeFormat.format(new Date()),
java.awt.TrayIcon.MessageType.INFO
)
);
}
},
5_000,
60_000
);
// add the application tray icon to the system tray.
tray.add(trayIcon);
} catch (java.awt.AWTException | IOException e) {
System.out.println("Unable to init system tray");
e.printStackTrace();
}
}
/**
* Shows the application stage and ensures that it is brought ot the front of all stages.
*/
private void showStage() {
if (stage != null) {
stage.show();
stage.toFront();
}
}
public static void main(String[] args) throws IOException, java.awt.AWTException {
// Just launches the JavaFX application.
// Due to way the application is coded, the application will remain running
// until the user selects the Exit menu option from the tray icon.
launch(args);
}
}
code source

To make a system tray try following code:
Original document link: https://docs.oracle.com/javase/tutorial/uiswing/misc/systemtray.html
//Check the SystemTray is supported
if (!SystemTray.isSupported()) {
System.out.println("SystemTray is not supported");
return;
}
final PopupMenu popup = new PopupMenu();
URL url = System.class.getResource("/images/new.png");
Image image = Toolkit.getDefaultToolkit().getImage(url);
final TrayIcon trayIcon = new TrayIcon(image);
final SystemTray tray = SystemTray.getSystemTray();
// Create a pop-up menu components
MenuItem aboutItem = new MenuItem("About");
CheckboxMenuItem cb1 = new CheckboxMenuItem("Set auto size");
CheckboxMenuItem cb2 = new CheckboxMenuItem("Set tooltip");
Menu displayMenu = new Menu("Display");
MenuItem errorItem = new MenuItem("Error");
MenuItem warningItem = new MenuItem("Warning");
MenuItem infoItem = new MenuItem("Info");
MenuItem noneItem = new MenuItem("None");
MenuItem exitItem = new MenuItem("Exit");
//Add components to pop-up menu
popup.add(aboutItem);
popup.addSeparator();
popup.add(cb1);
popup.add(cb2);
popup.addSeparator();
popup.add(displayMenu);
displayMenu.add(errorItem);
displayMenu.add(warningItem);
displayMenu.add(infoItem);
displayMenu.add(noneItem);
popup.add(exitItem);
trayIcon.setPopupMenu(popup);
try {
tray.add(trayIcon);
} catch (AWTException e) {
System.out.println("TrayIcon could not be added.");
}
Example system tray image in Windows 10
To invoke method of Javafx from awt event handler you may follw the following way:
yourAwtObject.addActionListener(e -> {
Platform.runLater(() -> primaryStage.show());
});

i made it. JavaFX with AWT. I have one example of a application that shows and hides when you make left clic. i really hope works for you
import java.awt.AWTException;
import java.awt.Image;
import java.awt.SystemTray;
import java.awt.Toolkit;
import java.awt.TrayIcon;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.net.URL;
import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.application.Platform;
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 MainApp2 extends Application {
int stateWindow = 1;
#Override
public void start(final Stage stage) throws Exception {
//Check the SystemTray is supported
if (!SystemTray.isSupported()) {
System.out.println("SystemTray is not supported");
return;
}
URL url = System.class.getResource("/image/yourImage.png");
Image image = Toolkit.getDefaultToolkit().getImage(url);
//image dimensions must be 16x16 on windows, works for me
final TrayIcon trayIcon = new TrayIcon(image, "application name");
final SystemTray tray = SystemTray.getSystemTray();
//Listener left clic XD
trayIcon.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent event) {
if (event.getButton() == MouseEvent.BUTTON1) {
Platform.runLater(new Runnable() {
#Override
public void run() {
if (stateWindow == 1) {
stage.hide();
stateWindow = 0;
} else if (stateWindow == 0) {
stage.show();
stateWindow = 1;
}
}
});
}
}
});
try {
tray.add(trayIcon);
} catch (AWTException e) {
System.out.println("TrayIcon could not be added.");
}
stage.setTitle("Hello man!");
Button btn = new Button();
btn.setText("Say 'Hello man'");
btn.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent event) {
System.out.println("Hello man!");
}
});
StackPane root = new StackPane();
root.getChildren().add(btn);
stage.setScene(new Scene(root, 300, 250));
Platform.setImplicitExit(false);
stage.show();
}
/**
* The main() method is ignored in correctly deployed JavaFX application.
* main() serves only as fallback in case the application can not be
* launched through deployment artifacts, e.g., in IDEs with limited FX
* support. NetBeans ignores main().
*
* #param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}

Popup Window gets stuck behind the main Window - JavaFX

So this problem is a bit of a tricky one. This class is for when, in my main program, I can produce a warning window for potentially dangerous actions that the user might do. The nice thing about this window is that if the user clicks OK, then it will return true to my main class. This is done through the following:
private boolean showWarningWindow(String message)
{
ConfirmationBox warning = new ConfirmationBox(message);
warning.showAndWait();
if (warning.isSelected())
{
return true;
}
return false;
}
This method is in my main GUI class. The problem is below, within ConfirmationBox. The line initModality(Modality.APPLICATION_MODAL); doesn't work properly. If you accidentally click back to your original GUI window, you're screwed, because now your ConfirmationBox window is trapped under your main window AND because of Modality.APPLICATION_MODAL, you won't be able to click anything to get the window back. There isn't a separate application on your taskbar to get the window back in focus and you can't even alt-tab to try and fix it.
Clearly the Modality.APPLICATION_MODAL works but somehow it doesn't make the connection that it needs to interrupt the main window.
Try it in your own applications. Add the showWarningWindow method to your application and add the ConfirmationWindow class and you will see what I mean. I'm not quite sure how to solve this.
package application;
import javafx.beans.property.*;
import javafx.geometry.*;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.stage.*;
public class ConfirmationBox extends Stage
{
private VBox layout = new VBox();
private ReadOnlyBooleanWrapper selected = new ReadOnlyBooleanWrapper();
public boolean isSelected()
{
return selected.get();
}
public ReadOnlyBooleanProperty selectedProperty()
{
return selected.getReadOnlyProperty();
}
public ConfirmationBox(String question)
{
// Core functionality of the ConfirmationBox.
setTitle("Warning");
initStyle(StageStyle.UTILITY);
initModality(Modality.APPLICATION_MODAL);
setResizable(false);
layout.setSpacing(10);
layout.setPadding(new Insets(10));
createControls();
// Add the Label and Buttons to the Confirmation Box.
layout.getChildren().addAll(new Label(question + "\n\n\n"), createControls());
java.awt.Toolkit.getDefaultToolkit().beep();
setScene(new Scene(layout));
sizeToScene(); // workaround because utility stages aren't automatically sized correctly to their scene.
}
private HBox createControls()
{
final Button ok = new Button("OK");
ok.setOnAction(e -> {
selected.set(true);
close();
});
final Button cancel = new Button("Cancel");
cancel.setOnAction(e -> {
selected.set(false);
close();
});
final HBox controls = new HBox(10, ok, cancel);
controls.setAlignment(Pos.CENTER_RIGHT);
return controls;
}
}

Creating an NSStatusItem/Menubar App in Java

I'm trying to emulate Objective C's NSStatusItem functionality in Java. That is, I'm trying to write a Java app that will sit in the Mac's menubar, like this. Here's a link to Apple's documentation on StatusBar.
Any way to do this in Java?

Use java.awt.SystemTray. I've confirmed it works on OS X Lion. According to this question, it's also possible to do with SWT.
Example:
import java.awt.AWTException;
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.ActionEvent;
import java.awt.event.ActionListener;
import java.net.MalformedURLException;
import java.net.URL;
public class MenuBarIconTest {
public static void main(String[] args) throws MalformedURLException {
TrayIcon trayIcon = null;
if (SystemTray.isSupported()) {
// get the SystemTray instance
SystemTray tray = SystemTray.getSystemTray();
// load an image
Image image = Toolkit.getDefaultToolkit().getImage(new URL("http://cdn1.iconfinder.com/data/icons/Hypic_Icon_Pack_by_shlyapnikova/16/forum_16.png"));
// create a action listener to listen for default action executed on the tray icon
ActionListener listener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println("action");
// execute default action of the application
// ...
}
};
// create a popup menu
PopupMenu popup = new PopupMenu();
// create menu item for the default action
MenuItem defaultItem = new MenuItem("Do the action");
defaultItem.addActionListener(listener);
popup.add(defaultItem);
/// ... add other items
// construct a TrayIcon
trayIcon = new TrayIcon(image, "Tray Demo", popup);
// set the TrayIcon properties
trayIcon.addActionListener(listener);
// ...
// add the tray image
try {
tray.add(trayIcon);
} catch (AWTException e) {
System.err.println(e);
}
// ...
} else {
// disable tray option in your application or
// perform other actions
//...
}
// ...
// some time later
// the application state has changed - update the image
if (trayIcon != null) {
//trayIcon.setImage(updatedImage);
}
}
}

There is a NICE library for doing this ... best one I've seen that integrates the SWIFT ability for menubar access with JavaFX ... since FX has no native way to work out of the menubar.
Here is the link if you're interested.