Java Swing transparent infinite load / loading animation flickering

Question

I have created an infinite transparent loading jframe however it flickers when setting Background to transparent with a call to f.setBackground(new Color(0, 0, 0, 0));, if setBackground is commented the JFrame shows the animated icon correctly.

Can anybody fix this?

import java.awt.Color;
import java.awt.EventQueue;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class InfiniteLoad extends JPanel
{
    private JPanel loadingPanel() throws MalformedURLException
    {
        JPanel panel = new JPanel();
        BoxLayout layoutMgr = new BoxLayout(panel, BoxLayout.PAGE_AXIS);
        panel.setLayout(layoutMgr);

        java.net.URL imageURL = new URL("http://oi59.tinypic.com/106a6vo.jpg");
        ImageIcon imageIcon = new ImageIcon(imageURL);
        JLabel iconLabel = new JLabel();
        iconLabel.setIcon(imageIcon);
        imageIcon.setImageObserver(iconLabel);

        JLabel label = new JLabel("Loading...");
        panel.add(iconLabel);
        panel.add(label);
        panel.setOpaque(false);
        return panel;
    }

    public static void main(String[] args) throws MalformedURLException
    {
        EventQueue.invokeLater(new Runnable()
        {
            @Override
            public void run()
            {
                JFrame f = new JFrame("Window");
                f.setUndecorated(true);

                //AWTUtilities.setWindowOpacity(f, 0.6f);
                //f.setOpacity(0.4f);

                InfiniteLoad imagePanel = new InfiniteLoad();
                JPanel jp = null;
                try
                {
                    jp = imagePanel.loadingPanel();
                }
                catch (MalformedURLException ex)
                {
                    Logger.getLogger(InfiniteLoad.class.getName()).log(Level.SEVERE, null, ex);
                }

                f.setContentPane(jp);
                f.setBackground(new Color(0, 0, 0, 0)); //<-- THIS CAUSES FLICKERING
                f.pack();
                f.setVisible(true);
            }
        });
    }
}

EDIT:

Ok problem was OpenJDK Java related, it displayed the mentioned problem with

java version "1.7.0_55"
OpenJDK Runtime Environment (IcedTea 2.4.7) (7u55-2.4.7-1ubuntu1~0.13.10.1)
OpenJDK 64-Bit Server VM (build 24.51-b03, mixed mode)

while running with

java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)

shows correctly. If anyone can show a workaround to make it work correctly also under buggy implementations, you're welcome.

Answer 1

sorry I don't understand.. which button? I have no buttons in my code

• I'm tested animated Images always in undecorated JButton (maybe one of my bad habits)

• can't found (not deepest research) good animated image saved as JPEG that works (all are transparent, nothing is visible from code attn in my post, then nothing flickering)

• there couldn't be/isn't an issue with animated GIF

  

code

import com.sun.awt.AWTUtilities;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Insets;
import java.net.MalformedURLException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
//http://stackoverflow.com/q/24797774/714968
public class InfiniteLoad extends JPanel {

    private JPanel loadingPanel() throws MalformedURLException {
        JPanel panel = new JPanel();
        BoxLayout layoutMgr = new BoxLayout(panel, BoxLayout.PAGE_AXIS);
        panel.setLayout(layoutMgr);
        ImageIcon imageIcon = new ImageIcon((getClass().getResource("/Images/smiley_018.gif")));
        JButton button = new JButton();
        button.setBorderPainted(false);
        button.setBorder(null);
        button.setFocusable(false);
        button.setMargin(new Insets(0, 0, 0, 0));
        button.setContentAreaFilled(false);
        button.setIcon(imageIcon);
        JLabel myLabel = new JLabel(imageIcon);
        JLabel label = new JLabel("Loading...", JLabel.CENTER);
        panel.add(button);
        panel.add(label);
        panel.add(myLabel);
        panel.setOpaque(false);
        return panel;
    }

    public static void main(String[] args) throws MalformedURLException {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                JFrame f = new JFrame("Window");
                f.setUndecorated(true);
                //AWTUtilities.setWindowOpacity(f, 0.1f);
                //f.setOpacity(0.1f);
                InfiniteLoad imagePanel = new InfiniteLoad();
                JPanel jp = null;
                try {
                    jp = imagePanel.loadingPanel();
                } catch (MalformedURLException ex) {
                    Logger.getLogger(InfiniteLoad.class.getName()).log(Level.SEVERE, null, ex);
                }
                f.setContentPane(jp);
                f.setBackground(new Color(0, 0, 0, 0)); //<-- THIS CAUSES FLICKERING
                f.pack();
                f.setVisible(true);
            }
        });
    }
}