当我单击“自定义颜色”链接时，我得到了这个可怕的 NullPointerException:
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
at javafx.stage.Window$9.invalidated(Window.java:867)
at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:109)
at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:144)
at javafx.stage.Window.setShowing(Window.java:922)
at javafx.stage.Window.show(Window.java:937)
at javafx.stage.Stage.show(Stage.java:259)
at com.sun.javafx.scene.control.skin.CustomColorDialog.show(CustomColorDialog.java:170)
at com.sun.javafx.scene.control.skin.ColorPalette$1.handle(ColorPalette.java:127)
at com.sun.javafx.scene.control.skin.ColorPalette$1.handle(ColorPalette.java:105)
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.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.Hyperlink.fire(Hyperlink.java:153)
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.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)
它的外观:
有办法修复吗？也许有某种方法可以切断底部的链接？代码:
colorMenu = new Menu("Color");
ColorPicker colorPicker = new ColorPicker();
colorPicker.setValue(Color.FIREBRICK);
m_palette = new MenuItem(null, colorPicker);
m_palette.setOnAction(event -> gameScene.setCellColor(colorPicker.getValue()));
感谢您的建议!
最佳答案
可以从 ColorPicker 中删除有问题的超链接。 在这里，我们用自己的 ColorPickerSkin 制作了一个 ColorPicker。然后我们就可以拦截 在返回之前在皮肤中创建弹出内容，以删除超链接。
public class CustomColorPicker extends ColorPicker {
@Override
protected Skin<?> createDefaultSkin() {
return new CustomColorPickerSkin(this);
}
private class CustomColorPickerSkin extends ColorPickerSkin {
public CustomColorPickerSkin(ColorPicker control) {
super(control);
}
@Override
protected Node getPopupContent() {
Node colorPalette = super.getPopupContent(); // This is an instance of private API ColorPalette which
// extends Region
Region r = (Region) colorPalette;
List<Node> vboxes = r.getChildrenUnmodifiable().stream().filter(e -> {
return e instanceof VBox;
}).collect(Collectors.toList()); // This ColorPalette contains a VBox which contains the Hyperlink we want
// to remove.
for (Node n : vboxes) {
VBox vbox = (VBox) n;
List<Node> hyperlinks = vbox.getChildren().stream().filter(e -> {
return e instanceof Hyperlink;
}).collect(Collectors.toList());
vbox.getChildren().removeAll(hyperlinks); // Remove the hyperlink
}
return colorPalette;
}
}
}
这将查找并删除 ColorPalette 中任何 VBox 内的任何超链接。请记住，如果 ColorPalette 的结构发生更改，它就会崩溃，这是完全有可能的，因为它不是公共(public) API。
它看起来如何:
关于JavaFX ColorPicker NullPointerException，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42812471/