java - 按下按钮后获取图像对应的文件名

Question

将一组图像文件添加到 File 类型的数组列表(filelist2)中。然后将 ImageView 和按钮添加到 vbox，这样的 vbox 使用 for 循环添加到gripane 的网格中。(迭代次数)等于文件列表的大小2)一旦按下按钮，我需要获取该vbox内图像的相应文件名。假设我按下了 (1,1) {i.e row no01 ,col no1} 处包含的按钮，我需要获取 (1,1) 处图像的文件名 这是屏幕截图:

这是我的代码: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++;
                }

            }

Answer 1

为什么不简单

System.out.println(filelist2.get(index).getName());

？

(实际上，我根本不清楚为什么要创建 filelist2。为什么不这样做

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);
                }


            }
        });
    }