CODEWITHSUNDEEP
javajavafxlabel
Towqir Ahmed Shaem
Towqir Ahmed Shaem

Reputation: 71

My Label sets up any text but I can't see it on screen but it can be seen from console

I was working with the label.But when I used the label.settext("Something"). It was working in the background that means it sets the string but it doesn't show it on the screen. You can ask me how you know this? I checked it on my console by using System.out.println(label.gettext()). It gives the correct output. But the level did not show "Something".

serialPort.addEventListener((SerialPortEvent serialPortEvent) -> {
        try{
            System.out.println("Your selected text for label : "+objectname);
                objectname="Nothing";
            label2.setText(objectname);
            System.out.println("Label gettext : "+label2.getText());    
        }catch(Exception e){
            e.printStackTrace();
        }
}

And it gives -> java.lang.IllegalStateException: Not on FX application thread; currentThread = EventThread COM5

Upvotes: 0

Views: 238

Answers (2)

Towqir Ahmed Shaem
Towqir Ahmed Shaem

Reputation: 71

Finally, This works for me: As I was invoking SerialPortEvent in a separate thread, so it required to use Platform.runLater(() -> { }); Right code is given below:

Platform.runLater(() -> {
                        if(objectname!= null){
                            System.out.println("Previousobject : "+previousobject);
                        label2.setText(previousobject);
                        }
                    });

Upvotes: 0

MBec
MBec

Reputation: 2210

Every change to any JavaFX Node must be invoked in FX application thread. Provided exception explains this. I assume that SerialPortEvent is invoked in separate thread, that is why you get an exception. To fix that set Labeltext in Platform.runLater().

CODE:

serialPort.addEventListener((SerialPortEvent serialPortEvent) -> {
    try {
        System.out.println("Your selected text for label : " + objectname);
        objectname = "Nothing";
        Platform.runLater(() -> {
            label2.setText(objectname);
        });
        System.out.println("Label gettext : " + label2.getText());
    } catch (Exception e) {
        e.printStackTrace();
    }
}

Upvotes: 1

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