Question

我认为唯一与此不同的是SceneBuilder的版本是8.3，我使用TreeTableView和TreeTableColumn与Oracle Java 8 这是fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.TreeTableColumn?>
<?import javafx.scene.control.TreeTableView?>

<TreeTableView maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" minHeight="1" minWidth="1" prefHeight="400.0" prefWidth="600.0" showRoot="false" stylesheets="@org/cornova/AudioExplorer.css" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="org.cornova.AudioExplorerController">
  <columns>
    <TreeTableColumn fx:id="mixerName" editable="false" maxWidth="6000.0" minWidth="100.0" prefWidth="-1.0" text="Mixers" />
    <TreeTableColumn fx:id="lineNames" maxWidth="49.0" minWidth="100.0" prefWidth="-1.0" text="Lines" />
      <TreeTableColumn fx:id="controlNames" minWidth="100.0" prefWidth="-1.0" text="Controls" />
      <TreeTableColumn fx:id="formatsNames" minWidth="100.0" prefWidth="-1.0" text="Formats" />
  </columns>
</TreeTableView>

这是控制器类

/**
 * Sample Skeleton for 'AudioExplorer.fxml' Controller Class
 */

package org.cornova;

import java.net.URL;
import java.util.ResourceBundle;
import javafx.fxml.FXML;
import javafx.scene.control.TreeTableColumn;

public class AudioExplorerController  {

    @FXML // ResourceBundle that was given to the FXMLLoader
    private ResourceBundle resources;

    @FXML // URL location of the FXML file that was given to the FXMLLoader
    private URL location;

    @FXML // fx:id="mixerName"
    private TreeTableColumn<?, ?> mixerName; // Value injected by FXMLLoader

    @FXML // fx:id="lineNames"
    private TreeTableColumn<?, ?> lineNames; // Value injected by FXMLLoader

    @FXML // fx:id="controlNames"
    private TreeTableColumn<?, ?> controlNames; // Value injected by FXMLLoader

    @FXML // fx:id="formatsNames"
    private TreeTableColumn<?, ?> formatsNames; // Value injected by FXMLLoader

    @FXML // This method is called by the FXMLLoader when initialization is complete
    void initialize() {
        assert mixerName != null : "fx:id=\"mixerName\" was not injected: check your FXML file 'AudioExplorer.fxml'.";
        assert lineNames != null : "fx:id=\"lineNames\" was not injected: check your FXML file 'AudioExplorer.fxml'.";
        assert controlNames != null : "fx:id=\"controlNames\" was not injected: check your FXML file 'AudioExplorer.fxml'.";
        assert formatsNames != null : "fx:id=\"formatsNames\" was not injected: check your FXML file 'AudioExplorer.fxml'.";

    }
}

这是主要的课程

package org.cornova;

import java.net.URL;
import javafx.application.Application;
import javafx.beans.property.ReadOnlyStringWrapper;
import javafx.fxml.FXMLLoader;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.TreeTableColumn.CellDataFeatures;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeTableColumn;
import javafx.scene.control.TreeTableView;
import javafx.stage.Stage;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Mixer;
import javax.sound.sampled.Mixer.Info;

/**
 *
 * @author walt
 */
public class AudioExplorer extends Application {

    private URL url;
    private FXMLLoader explorerLoader;
    private AudioExplorerController audioController;

    @Override
    public void start(Stage stage) throws Exception {
        stage.setTitle("Audio Explorer");
        final Scene scene = new Scene(new Group(), 200, 400);
        Group sceneRoot = (Group)scene.getRoot();
        try {
            url = getClass().getResource("/AudioExplorer.fxml");
            explorerLoader = new FXMLLoader(url);
            explorerLoader.setLocation(url);
            audioController = explorerLoader.getController();
        } catch (Exception e) {
            System.out.println(e);
        }      
        //Creating the root element
        TreeItem rootNode = new TreeItem();
        rootNode.setExpanded(true);   
        Info mixers[] = AudioSystem.getMixerInfo();
        rootNode = new TreeItem<>(mixers[0]);
        //Creating tree items
        for (int i = 0; i < mixers.length; i++) {
            rootNode.getChildren().add(new TreeItem<>(mixers[i]));
        }

        //Creating a column
        TreeTableColumn<Info,String> mixerInfo = new TreeTableColumn<>("Mixers");
        mixerInfo.setMaxWidth(1500);   

        //Defining cell content
        mixerInfo.setCellValueFactory((CellDataFeatures<Info, String> p) -> 
            new ReadOnlyStringWrapper(p.getValue().getValue().getName()));  

        //Creating a tree table view
        final TreeTableView<Info> treeTableView = new TreeTableView<>(rootNode);
        treeTableView.getColumns().add(mixerInfo);
        treeTableView.setMaxWidth(1500);
        treeTableView.setShowRoot(false);
        treeTableView.autosize();
        sceneRoot.getChildren().add(treeTableView);
        stage.setScene(scene);
        stage.show();     
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }

}

这都是在netbeans 8.2下完成的。我已经完成了，也许是18个月之前可能有几十个基于场景构建器的图形应用程序。我当时发现的一件事是确保css和控制器源的位置根据它们所在的名称空间进行调整，这反映在fxml中。

css文件是空的，因为我此时只在SceneBuilder中定义了它，这就是为什么我没有包含它（只有注释）。

有人认为我从开始使用SceneBuilder时就记得它是默认无效的倾向。 Tnanks！

Answer 1

您实际上需要为要根据fxml创建的控制器加载fxml。也没必要两次通过该位置：

url = getClass().getResource("/AudioExplorer.fxml");
explorerLoader = new FXMLLoader(url);

try {
    TreeTableView<?> audioExplorer = explorerLoader.load();
    audioController = explorerLoader.getController();
    ...
} catch ...

此外，没有理由在字段中保留对FXMLLoader实例的引用。完成加载后，只需提取您需要的信息即可。＆＃34; drop＆＃34;加载器参考。不管怎样，应该避免再次拨打load ......

Answer 2

除了fabian的答案之外，请注意我已经写了一些utility methods，这可以将FXML加载减少到单个语句，例如：

TreeTableView<?> audioExplorer = FXMLLoaders.load(AudioExplorer.class);

请注意，只有遵守以下命名约定才能实现：

如果是一个班级＆＃34; mypackage。＆lt; 名称＆gt;＆＃34;加载FXML文件，然后加载FXML文件应该在同一个包中并命名为＆＃34;＆lt; 名称＆gt; .fxml ＆＃34;。

该库是开源的。也许你觉得它很有用：

<dependency>  
    <groupId>org.drombler.commons</groupId>  
    <artifactId>drombler-commons-fx-core</artifactId>  
    <version>0.10</version>  
</dependency>

您可以在此处详细了解： http://puces-blog.blogspot.ch/2015/03/drombler-commons-conventions-to.html

javafx8 FXMLLoader返回null

2 个答案: