How to initialize variables when instanciating new interface fxml

Good afternoon

I have a small javaFX application,
during the passage of the authentication of the welcome interface interface I want to transfer user connection and other attributes and their use in the initialize method of the fxml welcome but I get them null?


This is the main class
the initialization of the variables is in the function loginOK()
public class MainGeoTrack extends Application{

    /**
     * @param args the command line arguments
     */
    private Stage stage;
    private Controller loggedController;
    private final double MINIMUM_WINDOW_WIDTH = 390.0;
    private final double MINIMUM_WINDOW_HEIGHT = 500.0;
    private String addIP;
    private String portService;
    private String portGPS;

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Application.launch(MainGeoTrack.class, (java.lang.String[])null);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
            stage = primaryStage;
            stage.setMinWidth(MINIMUM_WINDOW_WIDTH);
            stage.setMinHeight(MINIMUM_WINDOW_HEIGHT);
            gotoLogin();
            primaryStage.show();
    }

    public void setAddIP(String addIP) {
        this.addIP = addIP;
    }

    public void setPortService(String portService) {
        this.portService = portService;
    }


    public String getAddIP() {
        return addIP;
    }

    public String getPortService() {
        return portService;
    }


    
    
    
      private void gotoLogin() {
        try {
            LoginController login = (LoginController) replaceSceneContent("Login.fxml");
          login.setApp(this);
        } catch (Exception ex) {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
      
      public void loginOK(String loginController, String addIP, String portService, String portGPS) {
        try {
            WelcomeController welcome = (WelcomeController) replaceSceneContent("welcome.fxml");
            stage.setMinHeight(768);
            stage.setMinWidth(1024);
            stage.centerOnScreen();
            welcome.setControllerLogin(loginController);
            this.setAddIP(addIP);
            this.setPortService(portService);
      
          welcome.setApp(this);
        } catch (Exception ex) {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
      
      
      
    private Initializable replaceSceneContent(String fxml) throws Exception {
        FXMLLoader loader = new FXMLLoader();
        InputStream in = Main.class.getResourceAsStream(fxml);
        loader.setBuilderFactory(new JavaFXBuilderFactory());
        loader.setLocation(Main.class.getResource(fxml));
        AnchorPane page;
        try {
            page = (AnchorPane) loader.load(in);
        } finally {
            in.close();
        }
        
        // Store the stage width and height in case the user has resized the window
        double stageWidth = stage.getWidth();
        if (!Double.isNaN(stageWidth)) {
            stageWidth -= (stage.getWidth() - stage.getScene().getWidth());
        }
        
        double stageHeight = stage.getHeight();
        if (!Double.isNaN(stageHeight)) {
            stageHeight -= (stage.getHeight() - stage.getScene().getHeight());
        }
        
        Scene scene = new Scene(page);
        if (!Double.isNaN(stageWidth)) {
            page.setPrefWidth(stageWidth);
        }
        if (!Double.isNaN(stageHeight)) {
            page.setPrefHeight(stageHeight);
        }
        
        stage.setScene(scene);
        stage.sizeToScene();
        return (Initializable) loader.getController();
    }
}
and I'm getting these vars on this interface but traore are null
public class WelcomeController implements Initializable {
    @FXML
    private AnchorPane principalAnchor;

    MainGeoTrack app;
    
    public String controllerLogin;
    @FXML
    private TreeView treeViewCar;
    
    private Client client;
    private Service service;
    
    private List<CheckBoxTreeItem<String>> treeItems;
    private int controllerId;
    @FXML
    private Button buttonGeolocalisation;
    
    String addIP;
    String portService;

  

    public void setAddIP(String addIP) {
        this.addIP = addIP;
    }

    public void setPortService(String portService) {
        this.portService = portService;
    }


    public void setApp(MainGeoTrack app) {
        this.app = app;
    }

    public void setControllerLogin(String controllerLogin) {
        this.controllerLogin = controllerLogin;
    }
    
    
    /**
     * Initializes the controller class.
     */
    @Override
    public void initialize(URL url, ResourceBundle rb) {
        //this var is null
     System.out.println("login" + controllerLogin);
      
    }

    @FXML
    private void buttonGeolocalisationOnAction(ActionEvent event) {
        //System.out.println("add ip : " + app.getAddIP());
    }
    
}
Can anyone give a solution

Thank you

I think the problem is that the initialize (...) method in your controller welcome is called during FXMLLoader.load (...) method. before setting the value of the variable that you want to access there is.

When I need to share data between the controllers like that, I usually create a class that encapsulates the shared data and pass the same instance of it to the constructor of each controller. You must either set the controller in the Java code (and not specify it in the FXML), or define a custom for the FXML charger controller factory that instantiates the controllers with a reference to the shared data. The first way is usually more convenient, unless for some reason you cannot change the fx:controller attribute in your file FXML.

The basic structure looks like this:

public class GeoTrackDataModel {
  private final StringProperty addIP ;
  private final StringProperty portService ;
  private final StringProperty portGPS ;

  private final BooleanProperty loggedIn ;

  public GeoTrackDataModel() {
    addIP = new SimpleStringProperty(this, "addIP", "");
   // etc
  }

  // usual getXXX/setXXX/xxxProperty methods
}

public class WelcomeController {
  private final GeoTrackDataModel model ;
  public WelcomeController(GeoTrackDataModel model) {
    this.model = model ;
  }

  ... 

  public void setPortService(String portService) {
    model.setPortService(portService);
  }
 ...
}

// Similarly for LoginController

public class MainGeoTrack extends Application {
  private GeoTrackDataModel model ;

  ...

  @Override
  public void start(final Stage primaryStage) {
    model = new GeoTrackDataModel();
    // load welcome page when logged in:
    model.loggedInProperty().addListener(new ChangeListener() {
      @Override
      public void changed(ObservableValue obs, Boolean oldValue, Boolean newValue) {
        if (newValue) {
         loginOK(primaryStage) ;
        }
      }
    });
    gotoLogin(primaryStage);
    primaryStage.show();
  }

  private void gotoLogin(Stage stage) {
    LoginController loginController = new LoginController(model);
    FXMLLoader loader = new FXMLLoader();
    loader.setController(loginController);
    loader.setLocation(getClass().getResource("Login.fxml"));
    Parent page = (Parent) loader.load();
    stage.setScene(new Scene(page));
  }

  private void loginOK(Stage stage) {
    WelcomeController welcomeController = new WelcomeController(model);
    FXMLLoader loader = new FXMLLoader();
    loader.setController(welcomeController);
    loader.setLocation(getClass().getResource("Welcome.fxml"));
    Parent page = (Parent) loader.load();
    // your stage size preserving trick here, if needed.
    stage.setScene(new Scene(page));
  }
}

Update your LoginController so it sets the values of data in the model rather than directly in the controller class itself. Now your welcome controller can retrieve these values from the model. Don't forget to update Login.fxml and Welcome.fxml to remove the attributes of fx:controller (otherwise you will get a nice runtime error saying that the control is already set).

Notice that the I put in a property for 'connected' in the data model. The intention is that your connection controller must set it to true when the user is connected (instead of hanging at the main application and call the loginOK() method directly). Your main application class can listen to this and load the home page when it changes. This means that your connection controller does not need a reference to the application class, making separation much more own responsibility (you can now use your connection controller and the controller welcome in another application if necessary).

Edited by: James_D 26 May 2013 12:10

Tags: Java

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