期间更改 ImageIcon

Question

我有两个问题：

我正在创建一个简单的记忆游戏，它保存一个随机序列并期望来自玩家的相同输入，我正在尝试更改 JButton ImageIcon使用 setIcon() 单击 img1 的更亮版本，但在运行期间没有任何变化。

private final JButton btnImg1 = new JButton("");
ImageIcon img1 = new ImageIcon("C:\Users\vide\Desktop\img1.png");
ImageIcon img1_b = new  ImageIcon("C:\Users\vide\Desktop\img1_b.png");

try {
     btnImg1.setIcon(img1);
     Thread.sleep(2000);
     btnImg1.setIcon(img1_b);
 }

我做了 2 int Lists 来保存输入和随机序列，动态大小的原因：

List<Integer> seqAlea =  new ArrayList<Integer>();
List<Integer> seqInsere =  new ArrayList<Integer>();
int placar = 0;

Random geraNumero = new Random();

public void comecaJogo(){

    for(int i = 0; i < 3; i++){
        int numero = geraNumero.nextInt(4) + 1;             
        seqAlea.add(i, numero);
    }
}

有更好的方法吗？

Answer 1

首先，如果您不想阻塞主线程，切勿在主线程中使用睡眠，这将使您的应用程序等待直到睡眠结束，因此 "blocking" 您的主线程。

对于您的第一个问题，此代码将解决：

// Assuming that your image will be within your package
final URL resource = getClass().getResource("/com/mypackage/myimage.png");

final JButton btn = new JButton("My Button");
final Image image = ImageIO.read(resource);
final ImageIcon defaultIcon = new ImageIcon(image);

btn.setIcon(defaultIcon);
btn.addActionListener(new ActionListener() {

    public void actionPerformed(ActionEvent e) {
        try {
            //This will do the trick to brighten your image
            Graphics2D g2 = (Graphics2D) image.getGraphics();

            // Here we're creating a white color with 50% of alpha transparency
            g2.setColor(new Color(255, 255, 255, 50));
            // Fill the entire image with the new color
            g2.fillRect(0, 0, defaultIcon.getIconWidth(), defaultIcon.getIconHeight());
            g2.dispose();
            btnBtn.setIcon(new ImageIcon(image));
        } catch (Exception ex) {
            /*Although this is a bad practice, my point here is not 
             * to explain exceptions. 
             * But it's a good practice to always capture as many exceptions as you can
            */
        }
    }
});

好吧，您实际上不需要明确告知要在哪个位置添加元素，特别是如果它是一个序列。数组列表不对项目进行排序。

期间更改 ImageIcon

Change ImageIcon during

java

swing

jbutton

imageicon