单击Java FXML的调用方法

Question

I am creating a basic game launcher in JavaFX with SceneBuilder. Since SceneBuilder works in FXML, my launcher layout is in FXML. I have a method in my main class that I want to call on a button click. I read that you could use

#methodName

In the button's

onAction

property, but this does not work.

My main Java class:

@FXML
private void launchGame(ActionEvent e) {
    System.out.println("Launching...");
}

@Override
public void start(Stage primaryStage) throws IOException {
    Parent root = FXMLLoader.load(Main.class.getResource("launcher.fxml"));
    Scene scene = new Scene(root);
    primaryStage.setScene(scene);

    primaryStage.setTitle("First Week Login");
    primaryStage.setResizable(false);
    primaryStage.sizeToScene();

    primaryStage.show();
}

My FXML file:

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

<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.text.Text?>
<?import javafx.scene.web.WebView?>


<AnchorPane xmlns:fx="http://javafx.com/fxml/1" 
xmlns="http://javafx.com/javafx/8.0.102">
<children>
  <BorderPane prefHeight="493.0" prefWidth="664.0" styleClass="background" 
stylesheets="@launcher.css">
     <bottom>
        <HBox alignment="CENTER" prefHeight="100.0" prefWidth="200.0" 
BorderPane.alignment="CENTER">
           <children>
              <Button alignment="CENTER" mnemonicParsing="false" 
text="Launch Game" onAction="#launchGame" />
           </children>
        </HBox>
     </bottom>
     <top>
        <HBox alignment="CENTER" prefHeight="100.0" prefWidth="200.0" 
BorderPane.alignment="CENTER">
           <children>
              <Text strokeType="OUTSIDE" strokeWidth="0.0" 
styleClass="title" text="First Week" />
           </children>
        </HBox>
     </top>
     <center>
        <WebView prefHeight="200.0" prefWidth="200.0" 
BorderPane.alignment="CENTER" />
     </center>
  </BorderPane>
</children>
</AnchorPane>

Answer 1

You need to create a separate Controller class and specify it in top AnchorPane tag with fx:controller="packageName.Classname"

Like this:

<AnchorPane xmlns:fx="http://javafx.com/fxml/1"
 xmlns="http://javafx.com/javafx/8.0.102"
 fx:controller="com.packageName.Controller">

The called method should be inside the specified Controller class.

com.packageName is just an example, you should use the name of the package where you put the Controller class or no package name if it's not in any package.