我创建了一个名为的类NavButton。我希望能够将其用于.fxml文件。
问题是---“我创建了一个带有.fxml文件SceneBuilder包含一些按钮，然后更换标签Button带NavButton，但它不工作。
我可以找到有关如何使用SceneBuilder在.fxml中添加服装项的教程，但没有我可以手动进行的操作。
该NavButton类：
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.BooleanPropertyBase;
import javafx.css.PseudoClass;
import javafx.scene.control.Button;
public class NavButton extends Button {
/** Define a pseudo class */
private PseudoClass MARKED_PSEUDO_CLASS = PseudoClass.getPseudoClass("marked");
BooleanProperty marked = new BooleanPropertyBase(false) {
public void invalidated() {
pseudoClassStateChanged(MARKED_PSEUDO_CLASS, marked.get());
}
@Override
public Object getBean() {
return NavButton.this;
}
@Override
public String getName() {
return "marked";
}
};
public void setMarked(boolean m) {
marked.set(m);
}
}
有问题的.fxml文件：
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.RowConstraints?>
<fx:root prefHeight="44.0" prefWidth="626.0" style="-fx-border-color: white;" type="BorderPane" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1">
<center>
<GridPane prefHeight="32.0" prefWidth="514.0" BorderPane.alignment="CENTER">
<columnConstraints>
<ColumnConstraints />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<NavButton id="navigationBarButton" fx:id="djMode" mnemonicParsing="false" prefHeight="40.0" prefWidth="150.0" text="DJMode" GridPane.columnIndex="1" GridPane.halignment="CENTER" GridPane.rowIndex="1" />
<NavButton id="navigationBarButton" fx:id="simpleMode" mnemonicParsing="false" prefHeight="40.0" prefWidth="150.0" text="SimpleMode" GridPane.columnIndex="2" GridPane.halignment="CENTER" GridPane.rowIndex="1" />
<NavButton id="navigationBarButton" fx:id="librariesMode" mnemonicParsing="false" prefHeight="40.0" prefWidth="170.0" text="LibrariesMode" GridPane.columnIndex="3" GridPane.halignment="CENTER" GridPane.rowIndex="1" />
</children>
</GridPane>
</center>
<padding>
<Insets bottom="10.0" left="5.0" right="5.0" top="5.0" />
</padding>
<left>
<Button fx:id="settings" mnemonicParsing="false" BorderPane.alignment="CENTER" />
</left>
<right>
<HBox prefHeight="32.0" prefWidth="94.0" BorderPane.alignment="CENTER">
<children>
<Button fx:id="minimize" mnemonicParsing="false" styleClass="specialButton" />
<Button fx:id="maximize_normalize" mnemonicParsing="false" styleClass="specialButton" />
<Button fx:id="close" mnemonicParsing="false" styleClass="specialButton" />
</children>
</HBox>
</right>
</fx:root>
该错误是：
javafx.fxml.LoadException: NavButton is not a valid type.
/C:/eclipse/Building%20The%20XRPlayer/builder/bin/fxmls/NavigationBar.fxml:25
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2597)
at javafx.fxml.FXMLLoader.createElement(FXMLLoader.java:2774)
at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2704)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2527)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2409)
at windows.MainWindow$NavigationBar.<init>(MainWindow.java:533)
..........
似乎您更改的类时没有更新导入Button。
首先-由于FXML确实不能很好地与默认包配合使用（无论如何强烈建议不要这样做），因此您需要将NavButton类放在一个包中：
package com.mycompany.mydepartment.myproject ;
// imports ...
public class NavButton extends Button {
// code ...
}
然后将导入添加到FXML文件：
<?xml version="1.0" encoding="UTF-8"?>
<?import com.mycompany.mydepartment.myproject.NavButton?>
<!-- existing code... -->
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我来说两句