问题描述
我正在使用具有列表视图的Java程序。我想使用自定义列表视图单元格。 到目前为止，这是我的代码：
这是我的部分模型：
public class SectionModel {
String sectionName = new String();
public SectionModel(String sectionName) {
this.sectionName = sectionName;
}
public String getSectionName() {
return sectionName;
}
}
我在这里实现了setCellFactory：
@FXML
private ListView<SectionModel> selectQuizView;
ObservableList<SectionModel> gruppen;
gruppen = FXCollections.observableArrayList(sections);
selectQuizView.setItems(gruppen);
selectQuizView.setCellFactory(sectionCell -> new SectionListViewCellController());
这是我的ListViewCell：
public class SectionListViewCellController extends ListCell<SectionModel> {
public SectionListViewCellController() {
loadFXML();
}
private void loadFXML() {
try {
FXMLLoader loader = new FXMLLoader(getClass().getResource("sectionFXML.fxml"));
loader.setController(this);
loader.setRoot(this);
loader.load();
}
catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
protected void updateItem(SectionModel section,boolean empty) {
super.updateItem(section,empty);
sectionName.setText(section.getSectionName());
System.out.print(section.getSectionName());
}
@FXML
private Label sectionName;
}
错误消息：
Exception in Application start method
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 javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
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 java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)
Caused by: java.lang.RuntimeException: Exception in Application start method
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: java.lang.RuntimeException: javafx.fxml.LoadException: Root value already specified.
/Users/name/Desktop/QuiziApp/QuiziApp/target/classes/com/QuiziApp/sectionFXML.fxml
at com.QuiziApp.SectionListViewCellController.loadFXML(SectionListViewCellController.java:28)
at com.QuiziApp.SectionListViewCellController.<init>(SectionListViewCellController.java:17)
at com.QuiziApp.HomeController.lambda$0(HomeController.java:106)
at javafx.controls/javafx.scene.control.skin.ListViewSkin.createCell(ListViewSkin.java:432)
at javafx.controls/javafx.scene.control.skin.ListViewSkin.lambda$new$9(ListViewSkin.java:207)
at javafx.controls/javafx.scene.control.skin.VirtualFlow.getAvailableCell(VirtualFlow.java:1320)
at javafx.controls/javafx.scene.control.skin.VirtualFlow.addLeadingCells(VirtualFlow.java:2028)
at javafx.controls/javafx.scene.control.skin.VirtualFlow.layoutChildren(VirtualFlow.java:1250)
at javafx.graphics/javafx.scene.Parent.layout(Parent.java:1207)
at javafx.graphics/javafx.scene.Parent.layout(Parent.java:1214)
at javafx.graphics/javafx.scene.Parent.layout(Parent.java:1214)
at javafx.graphics/javafx.scene.Parent.layout(Parent.java:1214)
at javafx.graphics/javafx.scene.Scene.doLayoutPass(Scene.java:576)
at javafx.graphics/javafx.scene.Scene.preferredSize(Scene.java:1784)
at javafx.graphics/javafx.scene.Scene$2.preferredSize(Scene.java:393)
at javafx.graphics/com.sun.javafx.scene.SceneHelper.preferredSize(SceneHelper.java:66)
at javafx.graphics/javafx.stage.Window$12.invalidated(Window.java:1086)
at javafx.base/javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:110)
at javafx.base/javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145)
at javafx.graphics/javafx.stage.Window.setShowing(Window.java:1174)
at javafx.graphics/javafx.stage.Window.show(Window.java:1189)
at javafx.graphics/javafx.stage.Stage.show(Stage.java:273)
at com.QuiziApp.QuiziMain.start(QuiziMain.java:27)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
at javafx.graphics/com.sun.glass.ui.invokelaterdispatcher$Future.run(invokelaterdispatcher.java:96)
Caused by: javafx.fxml.LoadException: Root value already specified.
/Users/name/Desktop/QuiziApp/QuiziApp/target/classes/com/QuiziApp/sectionFXML.fxml
at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2621)
at javafx.fxml/javafx.fxml.FXMLLoader.createElement(FXMLLoader.java:2770)
at javafx.fxml/javafx.fxml.FXMLLoader.processstartElement(FXMLLoader.java:2719)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2552)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:2435)
at com.QuiziApp.SectionListViewCellController.loadFXML(SectionListViewCellController.java:25)
... 28 more
Exception running application com.QuiziApp.QuiziMain
解决方法
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