How to create splash screen as a Preloader in JavaFX standalone application? - javafx

Question

I created a Preloader (based on the following tutorial) that should display a splash screen for the main application.
9.3.4 Using a Preloader to Display the Application Initialization Progress
http://docs.oracle.com/javafx/2/deployment/preloaders.htm
public class SplashScreenLoader extends Preloader {
private Stage splashScreen;
#Override
public void start(Stage stage) throws Exception {
splashScreen = stage;
splashScreen.setScene(createScene());
splashScreen.show();
}
public Scene createScene() {
StackPane root = new StackPane();
Scene scene = new Scene(root, 300, 200);
return scene;
}
#Override
public void handleApplicationNotification(PreloaderNotification notification) {
if (notification instanceof StateChangeNotification) {
splashScreen.hide();
}
}
}
I'd like to run preloader each time I run the main application in my IDE (IntelliJ IDEA).
I also followed the packaging rules for preloaders in IntelliJ:
https://www.jetbrains.com/idea/help/applications-with-a-preloader-project-organization-and-packaging.html
When I run the main application the preloader doesn't start, so I suppose I'm missing something. I'm new to Preloaders and I don't understand what is the mechanism to connect the main app with the preloader in standalone application.

Answer 1

You can run using LauncherImpl like this . . .
public class Main {
public static void main(String[] args) {
LauncherImpl.launchApplication(MyApplication.class, SplashScreenLoader.class, args);
}
}
And the class MyApplication would be like this . . .
public class MyApplication extends Application {
#Override
public void start(Stage primaryStage) {
....
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}

Answer 2

The IDEs aren't great at adding preloaders yet. Take a look at the Manifest in your program's jar file and make sure this line is present:
JavaFX-Preloader-Class: SplashScreenLoader

Answer 3

May be too late, this can also help somebody.
For me, i used JavaFX service and task to create splash screen as a Preloader in JavaFX standalone application. This, because the contexte of my project.
Create the AnchorPane and the progress Pane
#FXML
private AnchorPane anchorPane;
private MaskerPane progressPane;
public static void main(String[] args) {
launch(args);
}
#Override
public void init() throws Exception {
progressPane = new MaskerPane();
progressPane.setText(bundle.getString("root.pleaseWait"));
progressPane.setVisible(false);
AnchorPane.setLeftAnchor(progressPane, 0.0);
AnchorPane.setTopAnchor(progressPane, 0.0);
AnchorPane.setRightAnchor(progressPane, 0.0);
AnchorPane.setBottomAnchor(progressPane, 0.0);
anchorPane.getChildren().add(progressPane);
}
#Override
public void start(Stage initStage) {
//.....
initRoot();
//.....
}
Create the splash screen service as this:
private final Service<Void> splashService = new Service<Void>() {
#Override
protected Task<Void> createTask() {
return new Task<Void>() {
#Override
public Void call() throws Exception {
//main code, the code who take time
//or
//Thread.sleep(10000);
return null;
}
};
}
};
Start service and show/hide the progressPane on initRoot when loading the main screen:
public void initRoot() {
try {
//....
splashService.restart();
//On succeeded, do this
splashService.setOnRunning(new EventHandler<WorkerStateEvent>() {
#Override
public void handle(WorkerStateEvent event) {
//Show mask on succeed
showMask(Boolean.TRUE);
}
});
splashService.setOnSucceeded(new EventHandler<WorkerStateEvent>() {
#Override
public void handle(WorkerStateEvent event) {
splashService.cancel();
//Hide mask on succeed
showMask(Boolean.FALSE);
}
});
//.....
primaryStage.show();
} catch (IOException ex) {
ex.printStackTrace();
}
}
To show/hide the progress...
showMask(boolean value){
progressPane.setVisible(value);
};