Question

我正在尝试从简单的ArrayList的内容中填充ListView。这是我的

Controller.java文件：

package design;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.ResourceBundle;

import javafx.beans.property.ListProperty;
import javafx.beans.property.SimpleListProperty;
import javafx.collections.FXCollections;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.ListView;

public class Controller {

    @FXML private Button buttontest;
    @FXML private ListView<Song> listViewofSongs;

    protected List<Song> songList = new ArrayList<>();
    protected ListProperty<Song> listProperty = new SimpleListProperty<Song>();
    Song Language = new Song("Peter", "myalbum", "yes", 2010);

    public void addSong(Song song){
        songList.add(song);
    }

    public void initialize(URL url, ResourceBundle rb) {
            addSong(Language);
            listViewofSongs.setItems(FXCollections.observableList(songList));
     }



}

这是我的Style.fxml文件：

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

<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.ListView?>
<?import javafx.scene.control.Separator?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.Pane?>
<?import javafx.scene.layout.RowConstraints?>
<?import javafx.scene.text.Font?>

<GridPane prefHeight="499.0" prefWidth="700.0" xmlns="http://javafx.com/javafx/8.0.65" xmlns:fx="http://javafx.com/fxml/1" fx:controller="design.Controller">
   <columnConstraints>
      <ColumnConstraints />
      <ColumnConstraints />
      <ColumnConstraints maxWidth="0.0" minWidth="0.0" prefWidth="0.0" />
      <ColumnConstraints maxWidth="0.0" minWidth="0.0" prefWidth="0.0" />
   </columnConstraints>
   <rowConstraints>
      <RowConstraints />
      <RowConstraints />
      <RowConstraints maxHeight="0.0" minHeight="0.0" prefHeight="0.0" />
      <RowConstraints maxHeight="10.0" minHeight="0.0" prefHeight="0.0" />
      <RowConstraints maxHeight="10.0" minHeight="0.0" prefHeight="0.0" />
      <RowConstraints fillHeight="false" maxHeight="500.0" minHeight="10.0" prefHeight="240.0" />
      <RowConstraints fillHeight="false" maxHeight="500.0" minHeight="10.0" prefHeight="149.0" />
      <RowConstraints fillHeight="false" maxHeight="500.0" minHeight="10.0" prefHeight="50.0" />
   </rowConstraints>
   <children>
      <Pane prefHeight="64.0" prefWidth="700.0">
         <children>
            <Label layoutX="259.0" layoutY="14.0" text="Song Library">
               <font>
                  <Font name="Consolas Bold" size="26.0" />
               </font>
               <padding>
                  <Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
               </padding>
            </Label>
         </children>
      </Pane>
      <Separator prefWidth="200.0" GridPane.rowIndex="4" />
      <ListView fx:id="listViewofSongs" editable="true" prefHeight="239.0" prefWidth="700.0" GridPane.rowIndex="5" />

      <Label text="Song Info" GridPane.halignment="CENTER" GridPane.rowIndex="6" GridPane.valignment="TOP">
         <GridPane.margin>
            <Insets bottom="10.0" />
         </GridPane.margin>
         <font>
            <Font name="Consolas" size="22.0" />
         </font>
         <padding>
            <Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
         </padding>
      </Label>
      <Label GridPane.rowIndex="6" />
      <Label text="NAME" GridPane.rowIndex="6">
         <font>
            <Font name="Calibri" size="19.0" />
         </font>
         <GridPane.margin>
            <Insets bottom="60.0" left="200.0" />
         </GridPane.margin>
      </Label>
      <TextField maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="25.0" prefWidth="343.0" GridPane.rowIndex="6">
         <GridPane.margin>
            <Insets bottom="60.0" left="275.0" />
         </GridPane.margin>
      </TextField>
      <Label text="ARTIST" GridPane.rowIndex="6">
         <font>
            <Font name="Calibri" size="19.0" />
         </font>
         <GridPane.margin>
            <Insets left="200.0" />
         </GridPane.margin>
      </Label>
      <TextField maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="25.0" prefWidth="343.0" GridPane.rowIndex="6">
         <GridPane.margin>
            <Insets left="275.0" />
         </GridPane.margin>
      </TextField>
      <Label text="ALBUM" GridPane.rowIndex="6">
         <font>
            <Font name="Calibri" size="19.0" />
         </font>
         <GridPane.margin>
            <Insets bottom="-60.0" left="200.0" />
         </GridPane.margin>
      </Label>
      <TextField maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="25.0" prefWidth="343.0" GridPane.rowIndex="6">
         <GridPane.margin>
            <Insets bottom="-60.0" left="275.0" />
         </GridPane.margin>
      </TextField>
      <Label text="YEAR" GridPane.rowIndex="6">
         <font>
            <Font name="Calibri" size="19.0" />
         </font>
         <GridPane.margin>
            <Insets bottom="-120.0" left="200.0" />
         </GridPane.margin>
      </Label>
      <TextField maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="25.0" prefWidth="343.0" GridPane.rowIndex="6">
         <GridPane.margin>
            <Insets bottom="-120.0" left="275.0" />
         </GridPane.margin>
      </TextField>
      <Button mnemonicParsing="false" prefHeight="28.0" prefWidth="75.0" text="ADD" GridPane.rowIndex="7">
         <GridPane.margin>
            <Insets left="125.0" />
         </GridPane.margin>
         <font>
            <Font name="Corbel" size="15.0" />
         </font>
      </Button>
      <Button mnemonicParsing="false" prefHeight="28.0" prefWidth="75.0" text="EDIT" GridPane.rowIndex="7">
         <font>
            <Font name="Corbel" size="15.0" />
         </font>
         <GridPane.margin>
            <Insets left="325.0" />
         </GridPane.margin>
      </Button>
      <Button mnemonicParsing="false" prefHeight="28.0" prefWidth="75.0" text="DELETE" GridPane.rowIndex="7">
         <font>
            <Font name="Corbel" size="15.0" />
         </font>
         <GridPane.margin>
            <Insets left="525.0" />
         </GridPane.margin>
      </Button>
      <Separator orientation="VERTICAL" prefHeight="200.0" GridPane.rowIndex="7">
         <GridPane.margin>
            <Insets left="250.0" />
         </GridPane.margin>
         <padding>
            <Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
         </padding>
      </Separator>
   </children>
</GridPane>

程序运行，但我输入的歌曲没有出现在ListView中（而Song类确实有toString方法）。

我该怎么办？

Answer 1

问题在于，财务主任并未作为预期问题的提问者进行初始化。

在Java 8中FXMLLoader的操作有点奇怪。

如果在Controller中定义了无参数initialize()方法并且没有实现Initializable接口，那么FXML加载器仍会自动调用initialize方法。 / p>
如果您在Controller中定义参数化public void initialize(URL url, ResourceBundle rb)方法，那么FXML加载程序将不会自动调用初始化方法，除非您的控制器也实现{{3接口。

由于问题中的代码使用的是参数化初始化方法而不是实现Initializable，因此未进行初始化。

Answer 2

如果我看得正确，您实际上并未使用initialize()方法中的URL和ResourceBundle参数。如果URL是fxml文件的路径，并且ResourceBundle包含GUI的internatonalization属性，那么您应该定义不带参数的initialize()方法，但使用@FXML进行注释。应将URL和ResourceBundle传递给FXMLLoader。

像

FXMLLoader loader = new FXMLLoader(URL, rb);

和

@FXML
private void initialize() { ... }

这样会自动调用initialize()。

Answer 3

我需要在类中实现Initializable并在调用方法之前添加@Override。

JavaFX FXML Controller初始化方法未被调用

3 个答案: