@FXML对象在initialize方法中为null [英] @FXML Objects are null in initialize Method

问题描述

我有一个(缩短的)java FX类:

i have a (shortened) java FX Class:

public class MyReportController extends
    javafx.application.Application implements Initializable {

@FXML
private CustomTextField autoTextField;
@Override
public void initialize(URL url, ResourceBundle resourceBundle) {


    TextFields.bindAutoCompletion(autoTextField, ServiceLocator
            .getInstance().getMeasurementService()
            .getAllMeasurementNumbers());
}......

initialzie方法被调用，但是autoTextField(和所有其他FXML组件)为空.

the initialzie method is called, but the autoTextField(and all other FXML components) is null.

应用程序是使用main方法从另一个类启动的.首先，我在控制器类中拥有main方法，其结果是，该控制器类被实例化了两次.我认为我当前的问题与此有关.

The Application is started from another class with the main method. First i had the main Method in the controller class with the result, that the controller class was instantiated twice. I think my current problem is related to that.

推荐答案

您必须在FXML中具有与要插入的属性名称相同的 fx:id 声明.因此，例如，在FXML中，CustomField控件声明应具有 fx:id = autoTextField .这样，依赖项将在初始化时注入.

You have to have the same fx:id declarations in your FXML as property names to inject. So for example, in FXML, CustomField controll declaration should have fx:id=autoTextField. This way dependencies will be injnected upon initialization.

第二件事，请不要使用扩展 Application 的控制器类.这根本没有目的.从与控制器不同的类启动应用程序，并且 FXMLLoader

Second thing, please dont use controller class that extends Application. This has simply no purpose here. Start application from different class that controller, and the controller class instance will be automaticly created once by FXMLLoader

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