Java Swing Image Slide Show 为什么图片没有改变

Question

您好，我创建了一个 class ImageSlide2 并且我有线程，但只有一次图片更改，为什么？

我不知道为什么只有一次图片更改。幻灯片放映必须始终显示更改后的图片这是我的代码：

public class ImageSlide2 extends JLabel {

    private Timer tm;
    private int xx = 0;
    String[] list = {
        "C:/Users/022/workspace22/EkranLCD/res/images/1.png", //0
        "C:/Users/022/workspace22/EkranLCD/res/images/3.png" //1     
    };

    public ImageSlide2(int x, int y, int width, int height) {
        setBounds(x, y, width, height);
        //Call The Function SetImageSize
        SetImageSize(list.length - 1);

        try {
            Thread.sleep(1000);
        } catch (InterruptedException e1) {
            e1.printStackTrace();
        }

        new Thread(new Runnable() {
            public void run() {
                try {
                    System.out.println(xx);
                    SetImageSize(xx);
                    xx += 1;
                    if (xx >= list.length) {
                        xx = 0;
                    }
                } catch (Exception ie) {
                }
            }
        }).start();

    }
    //create a function to resize the image 

    public void SetImageSize(int i) {

        ImageIcon icon = new ImageIcon(list[i]);
        Image img = icon.getImage();
        Image newImg = img.getScaledInstance(Config.xSize / 2, Config.ySize / 2, Image.SCALE_SMOOTH);
        ImageIcon newImc = new ImageIcon(newImg);
        setIcon(newImc);
    }
}

Answer 1

尝试使用 javax.swing.Timer 更改您的方法。像这样：

public ImageSlide2(int x, int y, int width, int height) {
    setBounds(x, y, width, height);
    //Call The Function SetImageSize
    SetImageSize(list.length - 1);

    final Timer t = new Timer(1000, new ActionListener() {
        public void actionPerformed(ActionEvent ae) {
            try {
                System.out.println(xx);
                SetImageSize(xx);
                xx += 1;
                if (xx >= list.length) {
                    xx = 0;
                }
            } catch (Exception ie) {
            }
        }
    });
    // t.setRepeats(false); // when you want to execute it at once
    t.start();
}

Answer 2

基于线程的解决方案如下 - 您需要在循环中添加睡眠，不断绘制然后睡眠等：

public ImageSlide2(int x, int y, int width, int height) {
    setBounds(x, y, width, height);
    //Call The Function SetImageSize
    SetImageSize(list.length - 1);


    new Thread(new Runnable() {
        public void run() {
            while(true)
            try {
                System.out.println(xx);
                SetImageSize(xx);
                xx += 1;
                if (xx >= list.length) {
                    xx = 0;
                }
                Thread.sleep(1000);
            } catch (Exception ie) { ie.printStackTrace();
            }

        }
    }).start();

}

Java Swing Image Slide Show 为什么图片没有改变

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