Question

这时，我学习了如何使用javafx fxml应用程序制作程序。我发现如何在listview上显示listcell。我使用下面的代码。但是从代码来看，它无法在列表视图上显示列表单元。当我运行该程序时，只显示listview，而listcell不会出现。请帮助我。

Main.java

public class Main extends Application {
    
    @Override
    public void start(Stage primaryStage) throws Exception {
        Parent root = FXMLLoader.load(getClass().getResource("Main.fxml"));
        
        Scene scene = new Scene(root);
        
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }
    
}

Main.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.ListView?>
<?import javafx.scene.layout.AnchorPane?>

<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1">
   <children>
      <ListView fx:id="listView" layoutX="67.0" layoutY="29.0" prefHeight="320.0" prefWidth="376.0" />
   </children>
</AnchorPane>

Student.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package belajarlistview;

/**
 *
 * @author kuupie
 */
public class Student {
    
    private static int studentIdAct = 0;
    private int studentId;
    private String name;
    private GENDER gender;

    enum GENDER {
        MALE,
        FEMALE
    }

    public Student(String name, GENDER gender) {
        studentId = studentIdAct++;
        this.name = name;
        this.gender = gender;
    }

    public int getStudentId() {
        return studentId;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public GENDER getGender() {
        return gender;
    }

    public void setGender(GENDER gender) {
        this.gender = gender;
    }
}

ListCell.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import de.jensd.fx.glyphs.fontawesome.FontAwesomeIconView?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.RowConstraints?>

<GridPane fx:id="listCellDetail" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="39.0" prefWidth="421.0" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1">
   <columnConstraints>
      <ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
      <ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
      <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
   </columnConstraints>
   <rowConstraints>
      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
   </rowConstraints>
   <children>
      <Label fx:id="label1" alignment="CENTER" prefHeight="36.0" prefWidth="137.0" text="Label">
         <GridPane.margin>
            <Insets left="10.0" />
         </GridPane.margin>
      </Label>
      <Label fx:id="label2" alignment="CENTER" prefHeight="36.0" prefWidth="137.0" text="Label" GridPane.columnIndex="2" />
      <FontAwesomeIconView fx:id="fxIconGender" strokeLineCap="ROUND" strokeLineJoin="ROUND" GridPane.columnIndex="1" />
   </children>
</GridPane>

StudentListViewCell.java

import java.io.IOException;

/**
 * Created by Johannes on 23.05.16.
 *
 */

public class StudentListViewCell extends ListCell<Student> {

    @FXML
    private Label label1;

    @FXML
    private Label label2;

    @FXML
    private FontAwesomeIconView fxIconGender;

    @FXML
    private GridPane gridPane;

    private FXMLLoader mLLoader;

    @Override
    protected void updateItem(Student student, boolean empty) {
        super.updateItem(student, empty);
        
                mLLoader = new FXMLLoader(getClass().getResource("/fxml/ListCell.fxml"));
                mLLoader.setController(this);

                try {
                    mLLoader.load();
                } catch (IOException e) {
                    e.printStackTrace();
                }

            label1.setText(String.valueOf(student.getStudentId()));
            label2.setText(student.getName());

            if(student.getGender().equals(Student.GENDER.MALE)) {
                fxIconGender.setIcon(FontAwesomeIcon.MARS);
            } else if(student.getGender().equals(Student.GENDER.FEMALE)) {
                fxIconGender.setIcon(FontAwesomeIcon.VENUS);
            } else {
                fxIconGender.setIcon(FontAwesomeIcon.GENDERLESS);
            }

            setText(null);
            setGraphic(gridPane);
    }
}

Controller.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package belajarlistview;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.ListCell;
import javafx.scene.control.ListView;
import javafx.util.Callback;

import java.net.URL;
import java.util.ResourceBundle;

public class Controller implements Initializable {

    @FXML
    private ListView<Student> listView;

    private final ObservableList<Student> studentObservableList;

    public Controller()  {

        studentObservableList = FXCollections.observableArrayList();

        //add some Students
        studentObservableList.addAll(
                new Student("John Doe", Student.GENDER.MALE),
                new Student("Jane Doe", Student.GENDER.FEMALE),
                new Student("Donte Dunigan", Student.GENDER.MALE),
                new Student("Gavin Genna", Student.GENDER.MALE),
                new Student("Darin Dear", Student.GENDER.MALE),
                new Student("Pura Petty", Student.GENDER.FEMALE),
                new Student("Herma Hines", Student.GENDER.FEMALE)
        );


    }

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        listView.setItems(studentObservableList);
        listView.setCellFactory(studentListView -> new StudentListViewCell());

    }

}

我尝试通过添加很多代码来解决它 setGraphic(student == null ? null : gridPane);上的这段代码StudentListViewCell.java和加此代码fx:controller="belajarlistview.Controller"上的Main.fxml

但是我有这样的错误： error 1

error

请帮助我

Answer 1

好的我有问题。此代码mLLoader = new FXMLLoader(getClass().getResource("/fxml/ListCell.fxml"));上的主要问题是，只需将此("/fxml/ListCell.fxml")更改为("ListCell.fxml")，程序即可正常运行。非常感谢@fabian

ListCell没有显示在ListView上

1 个答案: