Java SWT按钮图像不刷新(Java SWT Button Image Not Refreshing)

 我在按钮中显示图像，当单击按钮时，它会打开一个复合图像，允许我选择另一张图片用于按钮。 执行保存操作后，下面的代码会调整图片大小并将其保存到目录中。 然后它加载重新加载复合材料。 当复合加载按钮时，根据用户正在查看的记录的ID从默认位置拉取其图像。 我遇到的问题是按钮上的图像保持不变，除非我关闭并重新加载应用程序。 需要注意的一件有趣的事情是，当加载默认按钮图像时（即没有为其id保存图片），按钮图像会按原样改变，但仅在第一次时改变。 希望我已经说清楚我的问题，如果你需要我澄清请评论。 
 
 ---保存按钮代码 - 
 
Button btnSave = new Button(this, SWT.NONE);
    btnSave.addSelectionListener(new SelectionAdapter() {
        @Override
        public void widgetSelected(SelectionEvent e) {
            String path = txtPhotoPath.getText();
            if (CC_Files.fileExists(path)) {
                ArrayList<String> picTypes = new ArrayList<String>();
                picTypes.add(".jpg");
                picTypes.add(".png");
                picTypes.add(".gif");
                int t = 0;

                for(int i = 0; i < picTypes.size(); i++){
                    String s = picTypes.get(i);
                    if(path.contains(s.toUpperCase())){
                        t++;
                    }
                    if(path.contains(s.toLowerCase())){
                        t++;
                    }
                }
                if (t > 0) {
                    Image image = (Image) SWTResourceManager.getImage(path);
                    ImageData imgData = image.getImageData();
                    int intH = image.getBounds().height;
                    int intW = image.getBounds().width;
                    int h = (150 * intH) / intW;
                    int w = 150;
                    if (h > 150){
                        h = 150;
                        w = (150 * intW) / intH;
                    }
                    imgData = imgData.scaledTo(w, h);
                    ImageLoader imageLoader = new ImageLoader();
                    imageLoader.data = new ImageData[] { imgData };
                    imageLoader.save(Variables.getStrResources()
                            + "Pics\\" + a.getHerd_id() + ".jpg",
                            SWT.IMAGE_JPEG);
                    try {
                        Frm_Animal.setAnimalEditSC(Frm_Animal
                                .createAnimalComp(a));
                    } catch (Exception e1) {
                        // TODO Auto-generated catch block
                        e1.printStackTrace();
                    }
                }
            }
        }
    });
    GridData gd_btnSave = new GridData(SWT.LEFT, SWT.CENTER, false, false,
            1, 1);
    gd_btnSave.widthHint = 60;
    btnSave.setLayoutData(gd_btnSave);
    btnSave.setText("Save");
 
 ---创建复合按钮的代码--- 
 
Button btnPic = new Button(composite, SWT.CENTER);

    btnPic.addSelectionListener(new SelectionAdapter() {
        @Override
        public void widgetSelected(SelectionEvent e) {
            try {
                Comp_Add_Photo photo = new Comp_Add_Photo(
                        scrolledComposite, SWT.FILL, a);
                setAnimalEditSC(photo);

            } catch (Exception e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
        }
    });

    Image image = null;
    String strPic = Variables.getStrResources() + "Pics\\" + a.getHerd_id() +".jpg";
    if(CC_Files.fileExists(strPic)){
        image = (Image) SWTResourceManager
                .getImage(strPic);
    }else {
    image = (Image) SWTResourceManager
            .getImage(Variables.getStrResources() + "black_cow.png");
    }

    btnPic.setImage(image);

    btnPic.setToolTipText("Click Here To Add Photo");
    GridData gd_btnPic = new GridData(SWT.CENTER, SWT.CENTER, false, false,
            1, 7);
    gd_btnPic.heightHint = 160;
    gd_btnPic.widthHint = 160;
    btnPic.setLayoutData(gd_btnPic);

I am displaying an image in a button and when the button is clicked it opens a composite that allows me to select another picture to use for the button. Upon the save action the the code below resizes the picture and saves it to a directory. Then it loads the reloads the composite. When the composite loads the button pulls its image from a default location based on the id of the record the user is viewing. The problem I am having is that the image on the button remains the same unless I close and reload the application. An interesting thing to note is that when the default button image is loaded (i.e. there is no picture saved for its id) the button image changes as it should but only the first time. Hope I have described my problem clear enough if you need me to clarify please comment. 
 
--- Code For Save Button -- 
 
Button btnSave = new Button(this, SWT.NONE);
    btnSave.addSelectionListener(new SelectionAdapter() {
        @Override
        public void widgetSelected(SelectionEvent e) {
            String path = txtPhotoPath.getText();
            if (CC_Files.fileExists(path)) {
                ArrayList<String> picTypes = new ArrayList<String>();
                picTypes.add(".jpg");
                picTypes.add(".png");
                picTypes.add(".gif");
                int t = 0;

                for(int i = 0; i < picTypes.size(); i++){
                    String s = picTypes.get(i);
                    if(path.contains(s.toUpperCase())){
                        t++;
                    }
                    if(path.contains(s.toLowerCase())){
                        t++;
                    }
                }
                if (t > 0) {
                    Image image = (Image) SWTResourceManager.getImage(path);
                    ImageData imgData = image.getImageData();
                    int intH = image.getBounds().height;
                    int intW = image.getBounds().width;
                    int h = (150 * intH) / intW;
                    int w = 150;
                    if (h > 150){
                        h = 150;
                        w = (150 * intW) / intH;
                    }
                    imgData = imgData.scaledTo(w, h);
                    ImageLoader imageLoader = new ImageLoader();
                    imageLoader.data = new ImageData[] { imgData };
                    imageLoader.save(Variables.getStrResources()
                            + "Pics\\" + a.getHerd_id() + ".jpg",
                            SWT.IMAGE_JPEG);
                    try {
                        Frm_Animal.setAnimalEditSC(Frm_Animal
                                .createAnimalComp(a));
                    } catch (Exception e1) {
                        // TODO Auto-generated catch block
                        e1.printStackTrace();
                    }
                }
            }
        }
    });
    GridData gd_btnSave = new GridData(SWT.LEFT, SWT.CENTER, false, false,
            1, 1);
    gd_btnSave.widthHint = 60;
    btnSave.setLayoutData(gd_btnSave);
    btnSave.setText("Save");
 
---Code That Creates Button In Composite---
 
Button btnPic = new Button(composite, SWT.CENTER);

    btnPic.addSelectionListener(new SelectionAdapter() {
        @Override
        public void widgetSelected(SelectionEvent e) {
            try {
                Comp_Add_Photo photo = new Comp_Add_Photo(
                        scrolledComposite, SWT.FILL, a);
                setAnimalEditSC(photo);

            } catch (Exception e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
        }
    });

    Image image = null;
    String strPic = Variables.getStrResources() + "Pics\\" + a.getHerd_id() +".jpg";
    if(CC_Files.fileExists(strPic)){
        image = (Image) SWTResourceManager
                .getImage(strPic);
    }else {
    image = (Image) SWTResourceManager
            .getImage(Variables.getStrResources() + "black_cow.png");
    }

    btnPic.setImage(image);

    btnPic.setToolTipText("Click Here To Add Photo");
    GridData gd_btnPic = new GridData(SWT.CENTER, SWT.CENTER, false, false,
            1, 7);
    gd_btnPic.heightHint = 160;
    gd_btnPic.widthHint = 160;
    btnPic.setLayoutData(gd_btnPic);

原文：https://stackoverflow.com/questions/13962641