当我在JavaFX

时间：2016-06-20 20:57:52

标签： javafx

我试图在Java程序中为一个TextField实现一个changelistner，我希望该字段监听值的变化并运行另一个方法。我正在尝试使用

text1.textProperty().addListener(
(observable, oldvalue, newvalue) ->
    // code goes here
);

作为包含在内部的格式和initialize（）方法。 我遇到的问题是当我使用initialize方法时，我得到了所有

的空指针异常 
FXMLLoader.load(getClass().getClassLoader().getResource(".fxml"))

行。 这是相关的代码块 主类：

public class Main extends Application {

@Override
public void start(Stage primaryStage) throws Exception{
    Parent root =     FXMLLoader.load(getClass().getResource("MainWindow.fxml"));
    primaryStage.setTitle("Pathfinder Character Builder");
    primaryStage.setScene(new Scene(root, 900, 600));
    primaryStage.show();
}

public static void main(String[] args) {
    launch(args);
}

}

这是控制器类

公共类MainWindowController {

@FXML //  fx:id="myButton"
public Pane statsPane; // Value injected by FXMLLoader
public Pane skillsPane;
public Button statsButton;
public Button skillsButton;
@FXML
private TextField strStatTextBox;
public TextField dexStatTextBox;
public TextField conStatTextBox;
public TextField intStatTextBox;
public TextField wisStatTextBox;
public TextField chaStatTextBox;
public Button createStatsButton;
public Button getSetStrScore;
public BorderPane mainBorderPane;



@FXML
public void pressStatsButton(ActionEvent event) {
    statsPane.setVisible(true);
    skillsPane.setVisible(false);
}

@FXML
public void pressSkillsButton(ActionEvent event) {
    skillsPane.setVisible(true);
    statsPane.setVisible(false);
}

public void pressGetStrScoreButton(ActionEvent event) {
    updateStats();
}

public void updateStats() {
    Character char1 = Character.getInstance();
    strStatTextBox.setText(char1.getStrScore());
    dexStatTextBox.setText(char1.getDexScore());
    conStatTextBox.setText(char1.getConScore());
    intStatTextBox.setText(char1.getIntScore());
    wisStatTextBox.setText(char1.getWisScore());
    chaStatTextBox.setText(char1.getChaScore());
}

@FXML
public void pressCreateStatsButton(ActionEvent event) {
    Parent root;
    try {
        root = FXMLLoader.load(getClass().getClassLoader().getResource("rollStats.fxml"));
        Stage stage = new Stage();
        stage.setTitle("Roll My Stats");
        stage.setScene(new Scene(root, 400, 300));
        stage.showAndWait();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

}

上面的代码工作，除了没有strStatTextBox的更改侦听器。如果我将代码更改为MainController.class。 

public class MainWindowController {

@FXML //  fx:id="myButton"
public Pane statsPane; // Value injected by FXMLLoader
public Pane skillsPane;
public Button statsButton;
public Button skillsButton;
@FXML
private TextField strStatTextBox;
public TextField dexStatTextBox;
public TextField conStatTextBox;
public TextField intStatTextBox;
public TextField wisStatTextBox;
public TextField chaStatTextBox;
public Button createStatsButton;
public Button getSetStrScore;
public BorderPane mainBorderPane;


// Handle TextField text changes.
@FXML
private void initialize() {
    strStatTextBox.textProperty().addListener(
            (observable, oldvalue, newvalue) -> {
                System.out.println("listener works");
            }
    );
}

@FXML
public void pressStatsButton(ActionEvent event) {
    statsPane.setVisible(true);
    skillsPane.setVisible(false);
}

@FXML
public void pressSkillsButton(ActionEvent event) {
    skillsPane.setVisible(true);
    statsPane.setVisible(false);
}

public void pressGetStrScoreButton(ActionEvent event) {
    updateStats();
}

public void updateStats() {
    Character char1 = Character.getInstance();
    strStatTextBox.setText(char1.getStrScore());
    dexStatTextBox.setText(char1.getDexScore());
    conStatTextBox.setText(char1.getConScore());
    intStatTextBox.setText(char1.getIntScore());
    wisStatTextBox.setText(char1.getWisScore());
    chaStatTextBox.setText(char1.getChaScore());
}

@FXML
public void pressCreateStatsButton(ActionEvent event) {
    Parent root;
    try {
        root = FXMLLoader.load(getClass().getClassLoader().getResource("rollStats.fxml"));
        Stage stage = new Stage();
        stage.setTitle("Roll My Stats");
        stage.setScene(new Scene(root, 400, 300));
        stage.showAndWait();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

}

我做错了什么？谢谢你的帮助。

这是StackTrace 

javafx.fxml.LoadException: 
/C:/Users/mlpel/Dropbox/JavaFX%20Char%20Builder/Intellij%20IDEA%20Verson/out/production/Intellij%20IDEA%20Verson/rollStats.fxml

at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2601)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2571)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
**at **MainWindowController.pressCreateStatsButton(MainWindowController.java:83)****
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Node.fireEvent(Node.java:8411)
at javafx.scene.control.Button.fire(Button.java:185)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:380)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:294)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:416)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:415)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2566)
... 66 more
**Caused by: java.lang.NullPointerException
at MainWindowController.initialize(MainWindowController.java:47)**
... 76 more

Process finished with exit code 0

这是文件结构 FileStructure

以下是FXML，每个都有不同的控制器。 

<Pane fx:id="statsPane" prefHeight="300.0" prefWidth="400.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="rollStatsController">

<BorderPane fx:id="mainBorderPane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="600.0" prefWidth="900.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="MainWindowController">

0 个答案:

没有答案
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