这个问题已经在这里有了答案: > Passing Parameters JavaFX FXML 10个
我想问一下是否可以通过JavaFX类传递变量,是什么将Application扩展到JavaFx Controller?我是JavaFx的新手,可能只需要一点踢.
目标是将ID从MyClass传递到MyController.
我的应用程序类:
public class MyClass extends Application {
private String myVariable="Anything";
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) throws Exception {
URL location = getClass().getResource("MyGui.fxml");
FXMLLoader fxmlLoader = new FXMLLoader();
fxmlLoader.setLocation(location);
fxmlLoader.setBuilderFactory(new JavaFXBuilderFactory());
Parent root = FXMLLoader.load(location);
Scene scene = new Scene(root);
stage.setTitle(title);
stage.setScene(scene);
stage.show();
}
}
我的控制器:
public class Controller extends Group implements Binding {
public void initialize(Map<String, Object> namespace, URL location, Resources resources) {
// HERE I'D LIKE TO GET MY VARIABLE LIKE
System.out.println(myVariable);
}
@Override
public List<Handler> getHandlerChain() {
return null;
}
@Override
public void setHandlerChain(List<Handler> chain) {
}
@Override
public String getBindingID() {
return null;
}
}
解决方法:
首先,您将必须在MyClass中添加setter和getter(因为var是私有的)并将其更改为static:
private static String myVariable;
public String getMyVariable() {
return myVariable;
}
public void setMyVariable(String myVariable) {
this.myVariable = myVariable;
}
然后,由于MyClass是静态的,因此可以:
System.out.println(MyClass.getMyVariable());
工作示例:
MyClass.java
import java.net.URL;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.fxml.JavaFXBuilderFactory;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class MyClass extends Application {
private static String myVariable;
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) throws Exception {
setMyVariable("Anything");
URL location = getClass().getResource("MyGui.fxml");
FXMLLoader fxmlLoader = new FXMLLoader();
fxmlLoader.setLocation(location);
fxmlLoader.setBuilderFactory(new JavaFXBuilderFactory());
Parent root = FXMLLoader.load(location);
Scene scene = new Scene(root);
stage.setTitle("Hello Word");
stage.setScene(scene);
stage.show();
}
public static String getMyVariable() {
return myVariable;
}
public static void setMyVariable(String myVariable) {
MyClass.myVariable = myVariable;
}
}
MyController.java
import java.net.URL;
import java.util.ResourceBundle;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;
public class MyController implements Initializable{
@FXML Label labelVar;
@Override
public void initialize(URL arg0, ResourceBundle arg1) {
labelVar.setText(labelVar.getText() + MyClass.getMyVariable());
}
}
MyGui.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<Pane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="110.0" prefWidth="305.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="MyController">
<children>
<Label fx:id="labelVar" layoutX="24.0" layoutY="32.0" prefHeight="17.0" prefWidth="129.0" text="MyVariable = " />
</children>
</Pane>