[英]Label Binding Exception in Javafx
我在控制器类中:
public void initialize(URL location, ResourceBundle resources) {
//set Properties' values at the beginning
setProperties();
//bind string properties to labels
word.textProperty().bind(wordString);
meaning.textProperty().bind(meaningString);
sentence.textProperty().bind(sentenceString);
//listener to detect change in index and assign strings accordingly
DataHelper.intIndexProperty().addListener(
(v, oldValue, newValue) -> {
wordString.setValue(DataHelper.getListOfWords().get((int) newValue).get("word"));
meaningString.setValue(DataHelper.getListOfWords().get((int) newValue).get("meaning"));
sentenceString.setValue(DataHelper.getListOfWords().get((int) newValue).get("sentence"));
System.out.print("kjbmmj");
}
);
}
我有一个名为TimeChecker
的类,用于实现runanble
,该类在我的Main
Class中的start
方法中实例化并启动。 在TimeChecker类中:
public void run() {
try{
while (!isDone) {
System.out.println("Running!!");
System.out.println();
DataHelper.setCurrentDate(LocalDate.now());
if (!DataHelper.getOldDate().equals(DataHelper.getCurrentDate())) {
DataHelper.setIntIndex(DataHelper.getIntIndex()+1);
DataHelper.setOldDate(DataHelper.getCurrentDate());
DataHelper.saveData();
System.out.println("Saved!");
}
Thread.currentThread().sleep(2000);
}
错误:
Exception in thread "Thread-4" java.lang.IllegalStateException: Not on FX application thread; currentThread = Thread-4
at com.sun.javafx.tk.Toolkit.checkFxUserThread(Toolkit.java:204)
at com.sun.javafx.tk.quantum.QuantumToolkit.checkFxUserThread(QuantumToolkit.java:438)
at javafx.scene.Parent$2.onProposedChange(Parent.java:364)
at com.sun.javafx.collections.VetoableListDecorator.setAll(VetoableListDecorator.java:113)
at com.sun.javafx.collections.VetoableListDecorator.setAll(VetoableListDecorator.java:108)
at com.sun.javafx.scene.control.skin.LabeledSkinBase.updateChildren(LabeledSkinBase.java:575)
at com.sun.javafx.scene.control.skin.LabeledSkinBase.handleControlPropertyChanged(LabeledSkinBase.java:204)
at com.sun.javafx.scene.control.skin.LabelSkin.handleControlPropertyChanged(LabelSkin.java:49)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase.lambda$registerChangeListener$61(BehaviorSkinBase.java:197)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$$Lambda$160/1022376785.call(Unknown Source)
at com.sun.javafx.scene.control.MultiplePropertyChangeListenerHandler$1.changed(MultiplePropertyChangeListenerHandler.java:55)
at javafx.beans.value.WeakChangeListener.changed(WeakChangeListener.java:89)
at com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:182)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
at javafx.beans.property.StringPropertyBase.fireValueChangedEvent(StringPropertyBase.java:103)
at javafx.beans.property.StringPropertyBase.markInvalid(StringPropertyBase.java:110)
at javafx.beans.property.StringPropertyBase.access$000(StringPropertyBase.java:49)
at javafx.beans.property.StringPropertyBase$Listener.invalidated(StringPropertyBase.java:230)
at com.sun.javafx.binding.ExpressionHelper$SingleInvalidation.fireValueChangedEvent(ExpressionHelper.java:137)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
at javafx.beans.property.StringPropertyBase.fireValueChangedEvent(StringPropertyBase.java:103)
at javafx.beans.property.StringPropertyBase.markInvalid(StringPropertyBase.java:110)
at javafx.beans.property.StringPropertyBase.set(StringPropertyBase.java:144)
at javafx.beans.property.StringPropertyBase.set(StringPropertyBase.java:49)
at javafx.beans.property.StringProperty.setValue(StringProperty.java:65)
at sample.Controller.lambda$initialize$0(Controller.java:53)
at sample.Controller$$Lambda$86/694065084.changed(Unknown Source)
at com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:182)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
at javafx.beans.property.IntegerPropertyBase.fireValueChangedEvent(IntegerPropertyBase.java:106)
at javafx.beans.property.IntegerPropertyBase.markInvalid(IntegerPropertyBase.java:113)
at javafx.beans.property.IntegerPropertyBase.set(IntegerPropertyBase.java:147)
at sample.DataHelper.setIntIndex(DataHelper.java:123)
at sample.TimeChecker.run(TimeChecker.java:26)
at java.lang.Thread.run(Thread.java:745)
当intIndexProperty
的listener
启动时,我遇到了这个问题。 我知道这个问题还有其他类似的问题。 但是我听不懂答案。 我对代码违反Java规则的想法只有一个模糊的认识,即主应用程序线程以外的线程在任何情况下都不能更改UI。 任何人都可以正确地解释它,并用所需的代码回答如何解决此问题?
在Platform.runLater()
包装仅影响GUI的行,这样就不会使UI无响应。
喜欢:
public void run() {
try{
while (!isDone) {
System.out.println("Running!!");
System.out.println();
DataHelper.setCurrentDate(LocalDate.now());
if (!DataHelper.getOldDate().equals(DataHelper.getCurrentDate())) {
Platform.runLater(new Runnable(){
@Override
public void run() {
DataHelper.setIntIndex(DataHelper.getIntIndex()+1);
}
});
DataHelper.setOldDate(DataHelper.getCurrentDate());
DataHelper.saveData();
System.out.println("Saved!");
}
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