问题
A Set of imagefiles are added to an arraylist(filelist2) of type File.Then an imageview and a button are addded to a vbox,such vboxes are added to a grids of a gripane using a for loop.( number of iterations is equal to size of the filelist2)Once a button is pressed I need to get the corresponding filename of the image within that vbox. Say I pressed the button contained at (1,1) {i.e row no01 ,col no1} I need to get filename of image at (1,1) here's a screenshot:
here's my code: FXMLController
File file = new File("D:\\SERVER\\Server Content\\Apps\\icons");
File[] filelist1 = file.listFiles();
ArrayList<File> filelist2 = new ArrayList<>();
for (File file1 : filelist1) {
filelist2.add(file1);
}
btnar = new ArrayList<>();
for (int i = 0; i < filelist2.size(); i++) {
downloadbtn = new Button("Download");
btnar.add(downloadbtn);
final int index=i;
downloadbtn.setId(String.valueOf(index));
downloadbtn.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent arg0) {
try {
System.out.println("sssss");
downloadbtn.getId();
//System.out.println(filelist2.get(Integer.valueOf(downloadbtn.getId())).getName());
} catch (Exception ex) {
Logger.getLogger(HomeUI_2Controller.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
}
System.out.println(filelist2.size());
gridpane.setAlignment(Pos.CENTER);
gridpane.setPadding(new Insets(20, 20, 20, 20));
gridpane.setHgap(20);
gridpane.setVgap(20);
ColumnConstraints columnConstraints = new ColumnConstraints();
columnConstraints.setFillWidth(true);
columnConstraints.setHgrow(Priority.ALWAYS);
gridpane.getColumnConstraints().add(columnConstraints);
int imageCol = 0;
int imageRow = 0;
for (int i = 0; i < filelist2.size(); i++) {
System.out.println(filelist2.get(i).getName());
image = new Image(filelist2.get(i).toURI().toString());
pic = new ImageView();
pic.setFitWidth(130);
pic.setFitHeight(130);
pic.setImage(image);
vb = new VBox();
vb.getChildren().addAll(pic, (Button) btnar.get(i));
gridpane.add(vb, imageCol, imageRow);
GridPane.setMargin(pic, new Insets(2, 2, 2, 2));
imageCol++;
// To check if all the 3 images of a row are completed
if (imageCol > 2) {
// Reset Column
imageCol = 0;
// Next Row
imageRow++;
}
}
回答1:
Why not simply
System.out.println(filelist2.get(index).getName());
?
(Actually, it's not really clear to me why you create filelist2 at all. Why not do
btnar = new ArrayList<>();
for (int i=0; i < filelist1.length; i++) {
downloadbtn = new Button("Download");
btnar.add(downloadbtn);
final int index=i;
downloadbtn.setId(String.valueOf(index));
downloadbtn.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent arg0) {
try {
System.out.println("sssss");
System.out.println(filelist1[index].getName());
} catch (Exception ex) {
Logger.getLogger(HomeUI_2Controller.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
}
回答2:
Use setUserData and getUserData to store and retrieve custom values in Nodes ! Set the fileName as the userdata and on click, retrieve it.
downloadbtn.setUserData(filelist2.get(index).getName());
downloadbtn.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent arg0) {
System.out.println(downloadbtn.getUserData());
}
回答3:
Consider using a java.util.HashMap<Button, File> and calling hashMap.get(actionEvent.getSource()).getName() to get the file name.
回答4:
I've created a DataButton which can hold some typed data (unlike userData which has the type Object). You can specify a Renderer to render the data on the button or to render an alternative text, eg. in your case: "Download".
Eg. you could use something like this:
List<Path> pathlist2 = new ArrayList<>();
...
// provide language specific text for "Download"
ResourceBundle myResourceBundle = ...;
...
DownloadRenderer downloadRenderer = new DownloadRenderer(myResourceBundle);
...
// the dafault renderer would set the text property to path.toString()
DataButton<Path> downloadbtn = new DataButton<>(downloadRenderer);
downloadbtn.setData(pathlist2.get(index));
downloadbtn.setOnAction((actionEvent) -> {
Path path = downloadbtn.getData();
...
});
...
private static class DownloadRenderer extends AbstractDataRenderer<Object> {
private final ResourceBundle myResourceBundle;
public DownloadRenderer(final ResourceBundle myResourceBundle) {
this.myResourceBundle = myResourceBundle;
}
@Override
public String getText(Object item) {
return myResourceBundle.getString("downloadbtn.text");
}
}
As you can see, you can work directly with Path objects (which should be preferred to the legacy File objects). You don't have to cast or convert the data.
Note: you could also omit the DownloadRenderer and set the text property directly:
downloadbtn.setData(pathlist2.get(index));
downloadbtn.setText(myResourceBundle.getString("downloadbtn.text"));
But then you have to make sure to call setText always after setData.
The library is Open Source and is available from Maven Central:
<dependency>
<groupId>org.drombler.commons</groupId>
<artifactId>drombler-commons-fx-core</artifactId>
<version>0.4</version>
</dependency>
来源：https://stackoverflow.com/questions/25780721/getting-corresponding-filename-of-image-once-button-pressed