正在创建JavaFX GUI应用程序,但无法使用ListView在我的Controller类上工作。这是代码:
MP3.Java
package mp3player;
import javafx.application.Application;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.ListView;
import javafx.stage.Stage;
public class MP3 extends Application {
@Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("mp3player.fxml"));
primaryStage.setTitle("Hello World");
primaryStage.setScene(new Scene(root, 300, 275));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
MP3Controller.java
package mp3player;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.control.ListView;
public class MP3Controller {
ObservableList<String> songs = FXCollections.observableArrayList("Song 1", "Song 2");
ListView<String> songsView = new ListView<String>();
songsView.setItems(songs);
}
mp3player.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<GridPane alignment="center" hgap="10" scaleY="1.0" vgap="10" xmlns="http://javafx.com/javafx/10.0.2-internal" xmlns:fx="http://javafx.com/fxml/1" fx:controller="mp3player.MP3Controller">
<columnConstraints>
<ColumnConstraints />
</columnConstraints>
<rowConstraints>
<RowConstraints maxHeight="200.0" minHeight="171.0" prefHeight="200.0" />
<RowConstraints maxHeight="29.0" minHeight="0.0" prefHeight="0.0" />
</rowConstraints>
<children>
<VBox prefHeight="200.0" prefWidth="100.0">
<children>
<HBox prefHeight="50.0" prefWidth="100.0" />
<HBox prefHeight="100.0" prefWidth="200.0">
<children>
<ListView fx:id="songsView" prefHeight="67.0" prefWidth="146.0" />
</children></HBox>
<HBox prefHeight="47.0" prefWidth="100.0" />
</children>
</VBox>
</children>
</GridPane>
任何帮助将不胜感激。我不确定我正在密切关注文档时会发生什么情况,我怀疑这可能与导入javafx有关?如果是这样,您可以尝试在计算机中运行脚本并查看其是否有效。谢谢大家!
尝试以下在您的代码中,您尝试在方法或构造函数之外设置值,这就是为什么它不允许您设置值的原因
您可以通过创建构造函数或方法来完成
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.control.ListView;
public class MP3Controller {
ObservableList<String> songs = FXCollections.observableArrayList("Song 1", "Song 2");
ListView<String> songsView = new ListView<String>();
MP3Controller() {
songsView.setItems(songs);
}
}