我在另一个线程中再打开一个阶段时遇到问题。如果我在同一个帖子中打开这个阶段,就不会出现异常。
void hashMapDeclaration(){
actions2methods.put("NEW", new Runnable() {@Override public void run() { newNetCreation(); }});
actions2methods.put("LOAD", new Runnable() {@Override public void run() { loadNetState(); }});
...... //other hashes
}
HBox buttonBuilder(double spacing,double layoutX,String... bNames){
HBox lBar = new HBox(10);
.... //some code
for(final String text : bNames){ //in my case text variable value is "NEW" so it should run method newNetCreation
Button newButton = new Button();
newButton.setText(text);
.... //code
newButton.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent paramT) {
Thread t;
EventQueue.isDispatchThread();
t = new Thread(actions2methods.get(text));
t.start(); // Start the thread
System.out.println("button pressed");
}
});
lBar.getChildren().add(newButton);
}
return lBar;
}
void newNetCreation(){
final Stage dialogStage = new Stage();
final TextField textField;
dialogStage.initOwner(stage);
dialogStage.initModality(Modality.WINDOW_MODAL);
dialogStage.setFullScreen(false);
dialogStage.setResizable(false);
dialogStage.setScene(SceneBuilder
.create()
.fill(Color.web("#dddddd"))
.root(textField = TextFieldBuilder
.create()
.promptText("Enter user name")
.prefColumnCount(16)
.build()
)
.build()
);
textField.textProperty().addListener(new ChangeListener() {
public void changed(ObservableValue ov, Object oldValue, Object newValue) {
System.out.println("TextField text is: " + textField.getText());
}
});
dialogStage.show();
System.out.println("new net");
}
方法newNetCreation是导致问题的方法。我程序中的所有操作都存储在HashMap中。方法buttonBuilder创建新线程并应根据变量值启动方法,在我的情况下,他必须调用newNetCreation方法,但是当他尝试时,会发生以下异常:
Exception in thread "Thread-3" java.lang.IllegalStateException: Not on FX application thread; currentThread = Thread-3
at com.sun.javafx.tk.Toolkit.checkFxUserThread(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumToolkit.checkFxUserThread(Unknown Source)
at javafx.stage.Stage.<init>(Unknown Source)
at javafx.stage.Stage.<init>(Unknown Source)
at projavafx.starterapp.ui.StarterAppMain.newNetCreation(StarterAppMain.java:400)
at projavafx.starterapp.ui.StarterAppMain$7.run(StarterAppMain.java:354)
at java.lang.Thread.run(Thread.java:722)
答案 0 :(得分:8)
应该在FX应用程序线程上执行JavaFX的所有UI操作。
这是你的代码:
Thread t;
t = new Thread(actions2methods.get(text));
t.start(); // Start the thread
t
是您运行方法的线程。显然不是所提供的日志中所述的FX线程:java.lang.IllegalStateException: Not on FX application thread; currentThread = Thread-3
如果您想在FX线程上运行Runnable
,请使用下一个代码:
Platform.runLater(actions2methods.get(text));