我刚刚开始使用JavaFX,并且在使用带有Netbeans的Scene Builder时遇到了很多问题。
我想要完成的最新项目非常简单:当单击按钮时,ImageView将显示另一个图像。
我根据我的书告诉我要做的事情,但代码一直在Netbeans中崩溃。
这是我的代码:
package javafxapplication1;
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.image.Image;
import javafx.scene.image.ImageView;
public class FXMLDocumentController implements Initializable
{
@FXML
public Label label;
@FXML
public ImageView img;
private Image sample;
@FXML
public void handleButtonAction(ActionEvent event)
{
System.out.println("You clicked me!");
label.setText("Hello World!");
img.setImage(sample);
}
@Override
public void initialize(URL url, ResourceBundle rb)
{
sample = new Image("Users/limyunsoon/Desktop/models.jpg");
}
}
FXML文件:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.image.*?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<AnchorPane id="AnchorPane" prefHeight="200" prefWidth="320" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8" fx:controller="javafxapplication1.FXMLDocumentController">
<children>
<Button fx:id="button" layoutX="123.0" layoutY="142.0" onAction="#handleButtonAction" text="Click Me!" />
<Label fx:id="label" layoutX="126.0" layoutY="169.0" minHeight="16" minWidth="69" />
<ImageView fx:id="img" fitHeight="115.0" fitWidth="200.0" layoutX="60.0" layoutY="14.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="file:/Users/limyunsoon/Desktop/roadster.jpg" />
</image>
</ImageView>
</children>
</AnchorPane>
java文件:
package javafxapplication1;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class JavaFXApplication1 extends Application
{
@Override
public void start(Stage stage) throws Exception
{
Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
}
public static void main(String[] args)
{
launch(args);
}
}
答案 0 :(得分:0)
应该更改initialize方法:
@Override
public void initialize(URL url, ResourceBundle rb)
{
sample = new Image("Users/limyunsoon/Desktop/models.jpg");
}
应该是
@Override
public void initialize(URL url, ResourceBundle rb)
{
//added full image path and added "file" before the path
sample = new Image("file:c:/Users/limyunsoon/Desktop/models.jpg");
}
试试这个。希望它会有所帮助。
答案 1 :(得分:0)
Image
构造函数需要与fxml中的图像使用相同类型的URL。我建议将图像作为资源添加到程序中,否则在将程序移动到另一台机器后不太可能找到图像。
此外,在这种情况下,我建议从fxml:
初始化Image
@FXML
private Image sample;
...
@Override
public void initialize(URL url, ResourceBundle rb) {
}
<AnchorPane id="AnchorPane" prefHeight="200" prefWidth="320" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8" fx:controller="javafxapplication1.FXMLDocumentController">
<children>
<Button fx:id="button" layoutX="123.0" layoutY="142.0" onAction="#handleButtonAction" text="Click Me!" />
<Label fx:id="label" layoutX="126.0" layoutY="169.0" minHeight="16" minWidth="69" />
<ImageView fx:id="img" fitHeight="115.0" fitWidth="200.0" layoutX="60.0" layoutY="14.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="file:/Users/limyunsoon/Desktop/roadster.jpg" />
</image>
</ImageView>
</children>
<fx:define>
<Image fx:id="sample" url="file:/Users/limyunsoon/Desktop/models.jpg" />
</fx:define>
</AnchorPane>
(这假设加载第一张图片......)