JAVAFX在FXML网格窗格中添加动态元素
在我的FXML中,我创建了一个网格窗格。现在我想添加动态元素(比如按钮、文本字段) 通过java代码(而不是FXML),当我尝试这样做时,我得到了错误。请帮忙 我的FXML:JAVAFX在FXML网格窗格中添加动态元素,javafx,Javafx,在我的FXML中,我创建了一个网格窗格。现在我想添加动态元素(比如按钮、文本字段) 通过java代码(而不是FXML),当我尝试这样做时,我得到了错误。请帮忙 我的FXML: <AnchorPane fx:controller="tableview.TableViewSample" id="AnchorPane" maxHeight="- Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infi
<AnchorPane fx:controller="tableview.TableViewSample" id="AnchorPane" maxHeight="- Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns:fx="http://javafx.com/fxml">
<children>
<GridPane fx:id="greadpane" layoutX="0.0" layoutY="0.0" prefHeight="400.0" prefWidth="600.0">
<columnConstraints>
<ColumnConstraints fx:id="col0" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints fx:id="row0" minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
</rowConstraints>
</GridPane>
</children>
</AnchorPane>
由于您试图在stage.show()之前执行操作,所以fxml尚未初始化,因此得到了空指针。不要做肮脏的事情,把你的greadPane.add放在一个单独的控制器上
public class Controller implements Initializable {
@FXML
private GridPane greadpane;
@Override
public void initialize(URL url, ResourceBundle resourceBundle) {
final Label label = new Label("Address Book");
label.setFont(new Font("Arial", 20));
greadpane.add(label, 0, 0);
}
}
并将您的fxml分配给此控制器。没关系我遇到了同样的问题并使用了agonitor_uuu建议,但是我没有将gridPane拆分为一个新的控制器,而是创建了一个线程,在10毫秒后运行,以执行等待stage.show()的代码 在本例中,当observable通知gridPane时,gridPane将被更新,在本例中,当game.StartBeginErrorund()被执行时
public class Controller implements Initializable {
@FXML
private GridPane greadpane;
@Override
public void initialize(URL url, ResourceBundle resourceBundle) {
final Label label = new Label("Address Book");
label.setFont(new Font("Arial", 20));
greadpane.add(label, 0, 0);
}
}
public GameController(Game game) {
game.addObserver(this);
new Thread() {
@Override
public void run() {
try {
Thread.sleep(10);
Platform.runLater(() -> {
game.startBeginnerRound();
});
} catch (InterruptedException ex) {
Logger.getLogger(GameController.class.getName()).log(Level.SEVERE, null, ex);
}
}
}.start();
}