帧刷新问题

Question

我想创建一个面板更改图片。 这是我的面板：

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); 
} 
} 

我有保持面板的框架，但没有图片显示。 试图定期从框架重新绘制 - 造成了一些有趣的，但不想要的结果... 任何想法为什么？我究竟做错了什么？我应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); 

更新来其他的一些问题

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; 
     } 
    } 
}