问题描述
我的程序应该从文件中上传图像,然后将其显示为背景.我的问题是,当我在参数中创建Image
对象时,它会询问您要放置的文件.我试图将我的File对象放入其参数内,但无法正常工作.请帮我.我被卡住了.
My program is supposed to upload a image from a file and then it displays that image as the background. My problem is that when I create an Image
object in it's parameters it asks for the file which you are trying to put. I tried to putting my File object inside of its parameters and it's not working. Please help me. I'm Stuck.
public class FileOpener extends Application{
public void start(final Stage stage) {
stage.setTitle("File Chooser Sample");
final FileChooser fileChooser = new FileChooser();
final Button openButton = new Button("Choose Background Image");
openButton.setOnAction((final ActionEvent e) -> {
File file = fileChooser.showOpenDialog(stage);
if (file != null) {
// openFile(file);
// where my problem is
Image image1 = new Image("file");
// what I tried to do
// Image image1 = new Image(file);
ImageView ip = new ImageView(image1);
BackgroundSize backgroundSize = new BackgroundSize(100, 100, true, true, true, false);
BackgroundImage backgroundImage = new BackgroundImage(image1, BackgroundRepeat.REPEAT, BackgroundRepeat.NO_REPEAT, BackgroundPosition.CENTER, backgroundSize);
}
});
final StackPane stac = new StackPane();
stac.getChildren().add(openButton);
stage.setScene(new Scene(stac, 500, 500));
stage.show();
}
public static void main(String[] args) {
Application.launch(args);
}
}
推荐答案
问题是Image
的构造函数期望的是String url
,而您要传递的是File
.任何优秀的IDE都会告诉您给定方法作为其参数的期望.找到该键盘快捷方式并使用它(IntelliJ中的Ctrl + P).从那里开始,您所要做的就是找到一种将File
转换为表示其URL的String
的方法.在这种情况下:
The problem is that the constructor of Image
is expecting a String url
, whereas you're passing it a File
. Any good IDE will tell you what a given method is expecting as its parameters; find that keyboard shortcut and use it (Ctrl + P in IntelliJ). From there, all you have to do is find a way to convert a File
to a String
representing its url. In this case:
Image image1 = new Image(file.toURI().toString());
请注意,您实际上从未设置过背景图片,需要在lambda中添加以下行:
Note that you are never actually setting your background image, you need to add the following line to your lambda:
stac.setBackground(new Background(backgroundImage));
为此,您必须将stac
的声明移到动作侦听器上方.
For this though, you will have to move the declaration of stac
above your action listener.
这篇关于在JavaFX中从FileChooser打开图像的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!