如何解决JavaFx runlater 方法问题,当尝试访问使用 SceneBuilder
我在尝试使用 runLater() 以异步方式修改使用 SceneBuilder 创建的 JavaFx 标签时遇到问题。
我可以从按钮触发的回调中修改它,但是当我尝试从 runLater 方法访问同一个元素时,我收到一个错误,指出该元素为空。
jun 30,2021 3:42:25 P. M. javafx.fxml.FXMLLoader$ValueElement processValue
WARNING: Loading FXML document with JavaFX API of version 16 by JavaFX runtime of version 11.0.2
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Cannot invoke "javafx.scene.control.Label.setText(String)" because "this.texto" is null
at test.view.GuiApp.lambda$0(GuiApp.java:58)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$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)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
at java.base/java.lang.Thread.run(Thread.java:831)
我的代码:
public class GuiApp extends Application{
private Region rootLayout;
private Stage stage;
@FXML private Pane tankPane;
@FXML public Label texto ;
public static GuiApp main;
@Override
public void start(Stage primaryStage) throws IOException {
main = this;
stage = primaryStage;
stage.setTitle("mainStage");
stage.setResizable(false);
// Load root layout from fxml file.
FXMLLoader loader = new FXMLLoader();
loader.setLocation(GuiApp.class.getResource("main.fxml"));
rootLayout = (Region) loader.load();
// Show the scene containing the root layout.
Scene scene = new Scene(rootLayout);
stage.setScene(scene);
stage.show();
Platform.runLater(() -> texto.setText("klfdsfklañsd"));
}
public static void main(String[] args) {
launch(args);
}
@FXML
public void updaterandom()
{
Random r = new Random();
texto.setText(Float.toString(r.nextFloat()));
}
@FXML
private void onReload() {
updaterandom();
}
}
我试图将其简化为最简单的,顺便说一句,对不起我的英语。
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