How to refresh JavaFX screen twice after sleep? - javafx

Question

I am using JavaFX to show images on the screen. My FxScreenController code concept is like:
package my.image.concept;
import java.util.function.Consumer;
import javafx.application.Platform;
import javafx.fxml.FXML;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import org.springframework.stereotype.Component;
#Component
public class FxScreenController {
private ImageSenderClient imageClient;
#FXML
private ImageView imageView;
private Image image;
public FxScreenController(Image image) {
this.image = image;
}
#FXML
public void initialize(){
final ImageSubscriber imageSubscriber = new ImageSubscriber(image);
imageClient.GetImageFrom().subscribe(imageSubscriber);
}
private static class ImageSubscriber implements Consumer<Image> {
private ImageView imageFile;
public ImageSubscriber(Image newImage) {
this.imageFile.setImage(newImage);
}
#Override
public void accept(Image newImage) {
Platform.runLater(() -> imageFile.setImage(newImage));
}
}
}
I am displaying an image that comes from the Subscriber method.
In order to show image on JavaFX Screen, I am calling Platform.runLater(). The image is shown properly.
I would like to show my previous image back after a 2-seconds pause like this:
#Override
public void accept(Image newImage) {
Platform.runLater(() -> imageFile.setImage(newImage));
try {
Thread.sleep(2000); // Wait for 2 sec before updating back to prev image
} catch (InterruptedException ignored) {
//
}
Platform.runLater(() -> imageFile.setImage(prewImage));
}
However, here it doesn't show my newImage because it doesn't refresh the screen.
How can I can refresh the FX screen before calling Thread.sleep, so that I can show my newImage for 2 seconds on the FX screen?

Answer 1

Creating new Thread solved my problem.
#Override
public void accept(Image newImage) {
Thread timerThread = new Thread(() -> displayImage(newImage));
timerThread.start();
}
private void displayImage(Image newImage) {
Platform.runLater(() ->
imageBg.setImage(newImage)
);
try {
Thread.sleep(2000); // Wait for 2 sec before updating back to main
}
catch (InterruptedException ignored) {
}
imageBg.setImage(prevImage);
}