I have a project in school, where I need to do a 15 puzzle game in javaFX using the Controller and scene builder. I have a problem beacause I want to use a grid pane to put my picture in it and using the index to change position. Here is my code :
@FXML
private Button ouvrirTaquin;
@FXML
private GridPane gridPane;
@FXML
private ImageView c1;
@FXML
private ImageView c2;
@FXML
private ImageView c3;
@FXML
private ImageView c4;
@FXML
private ImageView c5;
@FXML
private ImageView c6;
@FXML
private ImageView c7;
@FXML
private ImageView c8;
@FXML
private ImageView c0;
Node[][] imageViewsTab = {{c1, c2, c3}, {c4, c5, c6}, {c7, c8, c0}};
Node[] imageViews = {c1,c2,c3,c4,c5,c6,c7,c8,c0};
Taquin taquin = new Taquin(imageViewsTab);
public void ouvrirTaquin(MouseEvent mouseEvent){
gridPane.add(imageViews[0], 0, 0); //(imageView, colonne, ligne)
gridPane.add(c2, 1, 0);
gridPane.add(c3, 2, 0);
gridPane.add(c4, 0, 1);
gridPane.add(c5, 1, 1);
gridPane.add(c6,2 , 1);
gridPane.add(c7, 0, 2);
gridPane.add(c8, 1, 2);
gridPane.add(c0, 2, 2);
if(mouseEvent.getSource() == ouvrirTaquin){
gridPane.toFront();
}
}
This code doesn't work but I don't know why TT but it work when I change this line
gridPane.add(imageViews[0], 0, 0); -> gridPane.add(c1, 0,0);
Here are the errors :
at javafx.fxml/javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1862)
at javafx.fxml/javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1729)
at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:234)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
at javafx.graphics/javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3563)
at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3865)
at javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1851)
at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2584)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:409)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:299)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:447)
at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:412)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:446)
at javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:556)
at javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:942)
at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(GtkApplication.java:277)
at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javafx.reflect.Trampoline.invoke(MethodUtil.java:76)
at jdk.internal.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at javafx.base/com.sun.javafx.reflect.MethodUtil.invoke(MethodUtil.java:273)
at javafx.fxml/com.sun.javafx.fxml.MethodHelper.invoke(MethodHelper.java:83)
at javafx.fxml/javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1857)
... 29 more
Caused by: java.lang.NullPointerException
at javafx.graphics/javafx.scene.layout.Pane.setConstraint(Pane.java:111)
at javafx.graphics/javafx.scene.layout.GridPane.setRowIndex(GridPane.java:299)
at javafx.graphics/javafx.scene.layout.GridPane.setConstraints(GridPane.java:556)
at javafx.graphics/javafx.scene.layout.GridPane.add(GridPane.java:973)
at Stages.Controller.ouvrirTaquin(Controller.java:513)
... 40 more
Thank you for your help ^^ (Sorry for my english hehe)
When this line of your code is executed...
all the
ImageView
variables are still null.You should initialize
imageViews
in theinitialize()
method in your controller class.Refer to this question and answer.