How to Display an Animated GIF as a Swing Container Background?

Displaying an Animated GIF as a Swing Background

Question

How can an animated (cycling) GIF be loaded and displayed as the background for a Swing container, as opposed to the static image loaded using ImageIO.read() or Toolkit.getImage()?

Answer

To obtain an animated GIF for custom painting, use an ImageIcon rather than ImageIO or Toolkit. ImageIcon provides an animated image, unlike the static image returned by the other methods.

The following code snippet illustrates how to load an animated GIF and use it as the background for a panel:

import java.awt.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.net.URL;

class ImagePanel extends JPanel {

    private Image image;

    ImagePanel(Image image) {
        this.image = image;
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawImage(image,0,0,getWidth(),getHeight(),this);
    }

    public static void main(String[] args) throws Exception {
        URL url = new URL("https://i.sstatic.net/iQFxo.gif");
        final Image image = new ImageIcon(url).getImage();
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JFrame f = new JFrame("Image");
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                f.setLocationByPlatform(true);

                ImagePanel imagePanel = new ImagePanel(image);
                imagePanel.setLayout(new GridLayout(5,10,10,10));
                imagePanel.setBorder(new EmptyBorder(20,20,20,20));
                for (int ii=1; ii<51; ii++) {
                    imagePanel.add(new JButton("" + ii));
                }

                f.setContentPane(imagePanel);
                f.pack();
                f.setVisible(true);
            }
        });
    }
}

In this code:

1. An ImageIcon is created using the new ImageIcon(url).getImage() line, and the resulting image is animated.
2. An ImagePanel is used to stretch the image to fit the panel's size.
3. Buttons are added to the ImagePanel to demonstrate the animated background.

Run this code to see the animated GIF displayed as the background.

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