Java 在 FXML 控制器类中找不到可注入的字段
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No injectable field found in FXML Controller class
提问by rzaaeeff
It's about JavaFX. When i want to inject fx:id in Scene Builder, i get this warning:
No injectable field found in FXML Controller class for the id 'something'.
I wanted to ignore it, and created a function, but it didn't work either. I created mainController class and added it into my FXML file. Here are my codes...
mainController.java
这是关于JavaFX。当我想在 Scene Builder 中注入 fx:id 时，我收到此警告：
在 FXML 控制器类中找不到 ID 'something' 的可注入字段。
我想忽略它，并创建了一个函数，但它也不起作用。我创建了 mainController 类并将其添加到我的 FXML 文件中。这是我的代码...
mainController.java
package main;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;
import javafx.scene.control.ProgressBar;
import javafx.scene.control.Slider;
public class mainController implements Initializable {
@Override
public void initialize(URL arg0, ResourceBundle arg1) {
// TODO Auto-generated method stub
}
@FXML
private ProgressBar pb;
@FXML
private Slider sl;
@FXML
private Label label;
public void changed(ActionEvent event){
}
}
Main.java
主程序
package main;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ProgressBar;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
public class Main extends Application {
@Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("/fxml/main.fxml"));
Scene scene = new Scene(root, 600, 400);
scene.getStylesheets().add("/fxml/styles/main.css");
ProgressBar pb1 = new ProgressBar();
ProgressBar pb2 = new ProgressBar();
//pb1.
//primaryStage.setResizable(false);
primaryStage.setScene(scene);
primaryStage.setTitle("Something");
primaryStage.show();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
main.fxml
主文件
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.*?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<AnchorPane id="AnchorPane" prefHeight="400.0" prefWidth="600.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8" fx:controller="main.mainController">
<children>
<BorderPane layoutX="14.0" layoutY="14.0" prefHeight="200.0" prefWidth="200.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<top>
<ProgressBar fx:id="pb" prefWidth="200.0" progress="0.0" BorderPane.alignment="CENTER">
<BorderPane.margin>
<Insets bottom="30.0" left="30.0" right="30.0" top="30.0" />
</BorderPane.margin>
</ProgressBar>
</top>
<bottom>
<Slider fx:id="sl" onDragDetected="#changed" BorderPane.alignment="CENTER">
<BorderPane.margin>
<Insets bottom="30.0" left="30.0" right="30.0" top="30.0" />
</BorderPane.margin>
</Slider>
</bottom>
</BorderPane>
</children>
</AnchorPane>
I did same things in my old projects, and they work like a charm. But this one seems not to obey me. Thanks in advance...
我在我的旧项目中做了同样的事情，它们就像一个魅力。但这个人似乎不听我的话。提前致谢...
采纳答案by José Pereda
In Scene Builder, if the FXML file is associated to a controller class, you know that what makes the connection between the variable in the controller class (pb) and the object in the FXML file (<ProgressBar ... />) is the value of the object's fx:id.
在 Scene Builder 中，如果 FXML 文件与控制器类相关联，您就会知道，控制器类中的变量 ( pb) 与 FXML 文件<ProgressBar ... />中的对象( ) 之间的联系是对象的fx:id.
So when you set an fx:idon an object, Scene Builder tries to parse the controller class trying to find a variable of that name.
因此，当您fx:id在对象上设置 an时，Scene Builder 会尝试解析控制器类，尝试查找该名称的变量。
If it doesn't find any, it displays this warning. It's just a reminder that you may want to add such a variable to the controller class, or that you have to choose other valid name from a list.
如果没有找到，它会显示此警告。这只是提醒您可能希望将此类变量添加到控制器类，或者您必须从列表中选择其他有效名称。
Since you have labeldefined on your controller, if you try to add a Labelon Scene Builder, you can get its fx:idfrom the list:
由于您已label在控制器上定义，如果您尝试Label在 Scene Builder 上添加一个，您可以fx:id从列表中获取它：
But if you assing another name, you will get the warning:
但是如果你指定另一个名字，你会收到警告：
On a side note, you don't need to instantiate the progress bar on the main class, since it will be instantiated in the controller. And ìf you try to link change(ActionEvent event)to a method in Scene Builder (#change), you have to annotate it with @FXML. Anyway, don't use onDragDetectedwith the slider.
附带说明一下，您不需要在主类上实例化进度条，因为它将在控制器中实例化。并且如果您尝试链接change(ActionEvent event)到 Scene Builder ( #change) 中的方法，则必须使用@FXML. 无论如何，不要onDragDetected与滑块一起使用。
回答by Mike Dever
don't forget that Netbeans will Auto-Generate the code in the controller class.
不要忘记 Netbeans 将自动生成控制器类中的代码。
Goto your FXMLDocument.fxml in your Netbeans project, and right click and select: "Make Controller".
转到 Netbeans 项目中的 FXMLDocument.fxml，然后右键单击并选择：“Make Controller”。
Also, remember to save your changes first to your FXMLDocument.fxml, in Scene builder.
另外，请记住首先将更改保存到场景构建器中的 FXMLDocument.fxml。
