如何通过 JavaFX 应用程序将变量传递给控制器？
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原文地址: http://stackoverflow.com/questions/24409550/
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How to pass a Variable through JavaFX Application to the Controller?
提问by Artur Rem
I'd like to ask if it is possible to pass a Variable through a JavaFX Class what extends Application to my JavaFx Controller? I am very new to JavaFx and only may need a little kick.
我想问一下是否可以通过 JavaFX 类传递一个变量，什么将应用程序扩展到我的 JavaFx 控制器？我对 JavaFx 很陌生，可能只需要一点点刺激。
The goal is to pass a Id from MyClass to MyController.
目标是将 Id 从 MyClass 传递给 MyController。
My Application class:
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();
}
}
My Controller:
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;
}
}
采纳答案by Mansueli
First you will have to add the setter and getter in the MyClass (as the var is private) and change it to static:
首先，您必须在 MyClass 中添加 setter 和 getter（就像 var 一样private）并将其更改为静态：
private static String myVariable;
public String getMyVariable() {
return myVariable;
}
public void setMyVariable(String myVariable) {
this.myVariable = myVariable;
}
Then, as the MyClass is static can do:
然后，由于 MyClass 是静态的，可以执行以下操作：
System.out.println(MyClass.getMyVariable());
Working example:
工作示例：
MyClass.java
我的类
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
我的控制器
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
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>
