Update FXML Screen

Question

I want to update a Screen, which i created with a FXML-file.

I though this: Link was the solution, but i dont get the code to run. I found some other parts of code but no one worked for me. I am not shure if i use a different version (see Link) or maybe i am just an idot... but we will see...

I made a very simple exampel to show my problem, so that hopefully someone can show me on this simple example how it works.

JavaFXApplication.java

package javafxapplication;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class JavaFXApplication extends Application {

    @Override
    public void start(Stage stage) throws Exception {
        Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
        Scene scene = new Scene(root);
        stage.setScene(scene);
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }

}

FXMLDocumentController.java

package javafxapplication;

import java.net.URL;
import java.util.ResourceBundle;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;

public class FXMLDocumentController implements Initializable {

    @FXML
    private Label label;

    @Override
    public void initialize(URL url, ResourceBundle rb) {
        label.setText("This Label was initialized.");
    }    

    public void update(){
        label.setText("This Label was updated :)"); //Just4Example... normaly here is some SQL-Stuff...
    }

}

FXMLDocument.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>

<AnchorPane id="AnchorPane" prefHeight="200" prefWidth="320" xmlns:fx="http://javafx.com/fxml" fx:controller="javafxapplication.FXMLDocumentController">
    <children>
        <Label layoutX="100" layoutY="100" minHeight="16" minWidth="69" fx:id="label" />
    </children>
</AnchorPane>

I want to start the "update"-Methode in the controller every 5 seconds. But when i use a Timer to do this... the Controller is gone. So when the Timer starts the Methode there are no @FXML connections... Maybe the Controller should created manualy... or linke the second linke... but i dont get the code to run... confused... frustrated...

Thank you very much

Uluk Biy · Accepted Answer · 2013-09-27T16:32:23.577

2

Try this

@Override
public void initialize(URL url, ResourceBundle rb) {
    label.setText("This Label was initialized.");
    Timeline timeline = new Timeline(
            new KeyFrame(Duration.seconds(2),
            new EventHandler<ActionEvent>() {
        @Override
        public void handle(ActionEvent actionEvent) {
            // Call update method for every 2 sec.
            update();
        }
    }));
    timeline.setCycleCount(Animation.INDEFINITE);
    timeline.play();
}

However using timeline in SQL query task will block UI JavaFX thread, causing the screen to freeze while querying. So use ScheduledService (introduced in JavaFX 8) instead.

edited Sep 27 '13 at 16:32

answered Sep 27 '13 at 15:15

Uluk Biy

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I got an Error at "new EventHandler – user2111880 Sep 30 '13 at 08:01
@user2111880, did you import javafx.event.EventHandler and javafx.event.ActionEvent? Check it. – Uluk Biy Sep 30 '13 at 08:29
I had a diffrent EventHandler import... but i still got errors... these are my import: import java.awt.event.ActionEvent; import javafx.event.EventHandler; import java.net.URL; import java.util.ResourceBundle; import javafx.animation.Animation; import javafx.animation.KeyFrame; import javafx.animation.Timeline; import javafx.fxml.FXML; import javafx.fxml.Initializable; import javafx.scene.control.Label; import javafx.util.Duration; are they correct? – user2111880 Oct 01 '13 at 08:24
sorry... sometimes writing a problem solves it ;) i chancent also import javafx.event.ActionEvent;... now it works - thank you very much – user2111880 Oct 01 '13 at 08:32

Update FXML Screen

1 Answers1