javafx – FXMLLoader getController返回NULL?

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我有主要的应用程序类,做以下只是罚款:
@Override
   public void start(Stage primaryStage) {
      try {
         FXMLLoader loader = new FXMLLoader(getClass().getResource(
               "RecordScreen.fxml"));
         Parent root = (Parent) loader.load();
         Scene newScene = new Scene(root);
         Stage newStage = new Stage();
         newStage.setScene(newScene);
         newStage.show();
      } catch (Exception e) {
         e.printStackTrace();
      }
   }

它启动显示人物的表视图.我选择一个人,点击编辑按钮,并尝试启动一个窗口,让我编辑它们.

@FXML
   public void editPerson() {
      try {
         FXMLLoader loader = new FXMLLoader(getClass().getResource(
               "PersonEditor.fxml"));
         PersonEditorCtrl ctrl = loader.getController();
         ctrl.init(table.getSelectionModel().getSelectedItem());
         Parent root = (Parent) loader.load();
         Scene newScene = new Scene(root);
         Stage newStage = new Stage();
         newStage.setScene(newScene);
         newStage.show();
      } catch (Exception e) {
         e.printStackTrace();
      }
   }

问题是getController返回null.我过去2周一直在追随这个模式,没有任何问题.我现在做错了什么?这些无法追溯的错误正在恶化!

这是我的两个fxmls:

带桌面的屏幕:

<AnchorPane xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/2.2" fx:controller="application.RecordsCtrl">
  <!-- TODO Add Nodes -->
  <children>
    <VBox id="VBox" alignment="CENTER" spacing="0.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
      <children>
        <TableView fx:id="table" prefHeight="-1.0" prefWidth="-1.0">
          <columns>
            <TableColumn prefWidth="75.0" text="Name" fx:id="nameCol" />
            <TableColumn prefWidth="75.0" text="Age" fx:id="ageCol" />
          </columns>
        </TableView>
        <Button mnemonicParsing="false" onAction="#editPerson" text="Edit" />
      </children>
    </VBox>
  </children>
</AnchorPane>

人物编辑:

<AnchorPane xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/2.2" fx:controller="application.PersonEditorCtrl">
  <!-- TODO Add Nodes -->
  <children>
    <VBox layoutX="0.0" layoutY="0.0" prefHeight="-1.0" prefWidth="-1.0">
      <children>
        <TextField fx:id="nameField" prefWidth="200.0" />
        <TextField fx:id="ageField" prefWidth="200.0" />
        <Button mnemonicParsing="false" text="Button" />
      </children>
    </VBox>
  </children>
</AnchorPane>

解决方法

改变这个
@FXML
   public void editPerson() {
      try {
         FXMLLoader loader = new FXMLLoader(getClass().getResource(
               "PersonEditor.fxml"));
         PersonEditorCtrl ctrl = loader.getController();
         ctrl.init(table.getSelectionModel().getSelectedItem());
         Parent root = (Parent) loader.load();
         Scene newScene = new Scene(root);
         Stage newStage = new Stage();
         newStage.setScene(newScene);
         newStage.show();
      } catch (Exception e) {
         e.printStackTrace();
      }
   }

对此:

@FXML
   public void editPerson() {
      try {
         FXMLLoader loader = new FXMLLoader(getClass().getResource(
               "PersonEditor.fxml"));
         Parent root = (Parent) loader.load();
         PersonEditorCtrl ctrl = loader.getController();
         ctrl.init(table.getSelectionModel().getSelectedItem());

         Scene newScene = new Scene(root);
         Stage newStage = new Stage();
         newStage.setScene(newScene);
         newStage.show();
      } catch (Exception e) {
         e.printStackTrace();
      }
   }

您首先必须运行loader.load(),然后才能得到Controller.

帕特里克

原文链接:https://www.f2er.com/java/122228.html

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