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
