Question

我正在尝试创建一个更改图片的面板。这是我的小组：

public class AdvertisementPanel extends JPanel {
private BufferedImage image;

private ArrayList<String> pictures;
private int index = 0;

public AdvertisementPanel(String... pics) {
pictures = new ArrayList<String>(Arrays.asList(pics));
Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate(
 new Runnable() {
  @Override
  public void run() {
   changeImage();
  }
}, 0, 5, TimeUnit.SECONDS);

}

public void paint(Graphics g) {
 g.drawImage(image, 0, 0, null);
}

private void changeImage() {
 String name = pictures.get(index);
try {
 File input = new File(name);
 image = ImageIO.read(input);
 index++;
 index %= pictures.size();
} catch (IOException ie) {
 Logger.getLogger().log(Level.SEVERE,
  "No adds found in given path: " + name);
}
}

我有一个框架，用于固定面板，但没有显示图片。试图定期从框架重新绘制 - 引起一些有趣但不想要的结果...... 有什么想法吗？我究竟做错了什么？我该如何刷新框架的组件？

Answer 1

每次更改图像时都需要重新绘制。

哦，它应该由swing事件处理线程来完成：

Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate(
 new Runnable() {
  @Override
  public void run() {
    SwingUtilities.invokeLater(new Runnable() {
      @Override
      public void run() {
        changeImage();
        repaint();
       }
    };
  }
}, 0, 5, TimeUnit.SECONDS);

更新更正其他一些问题

public class AdvertisementPanel extends JPanel {
    private BufferedImage image;
    private ArrayList<String> pictures;
    private int index = 0;

    public AdvertisementPanel(String... pics) {
        pictures = new ArrayList<String>(Arrays.asList(pics));
        Executors.newSingleThreadScheduledExecutor().scheduleAtFixedRate(
            new Runnable() {
                @Override
                public void run() {
                    changeImage();
                }
            }, 0, 5, TimeUnit.SECONDS);
    }

    private void changeImage() {
        final BufferedImage img = nextImage();
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                image = img;
                repaint();
            }
        });
    }

    public void paint(Graphics g) {
        if (image != null) {
            g.drawImage(image, 0, 0, null);
        }
    }

    private BufferedImage nextImage() {
        String name = pictures.get(index);
        try {
            index++;
            index %= pictures.size();
            File input = new File(name);
            return ImageIO.read(input);
        } catch (IOException ie) {
            Logger.getLogger("").log(Level.SEVERE,
                    "No adds found in given path: " + name);
            return null;
        }
    }
}

帧刷新问题

1 个答案: