Traditionally we are using splash screen with progress bar through JFrame or JWindow in Java swing application. But this approach, big disadvantage is splash screen is loaded after jvm is ready and necessary classes are loaded.
In Java 6 provides convient way to show the splash screen even before jvm is get ready.
It can integrate into JAR file also. When double click the jar the splash screen show right now. when jvm start loading. after loading jvm we can procees the splash screen ie. we draw into splah screen, show progress bar , etc..
Java supports splash screen in gif,
png, and
jpeg format.
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.SplashScreen;
import java.awt.Toolkit;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
public class SplashScreenDemo {
private static JFrame wkFrame;
public SplashScreenDemo() {
}
/**
* @param args
*/
public static void main(final String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
Graphics2D g = null;
final SplashScreen splash = SplashScreen.getSplashScreen();
if (splash == null) {
System.out.println("Splash not supported");
} else {
g = splash.createGraphics();
renderSplashFrame(g, 1, "Iniitiating");
splash.update();
}
// Create the top-level container and add contents to it.
wkFrame = new JFrame("Simple Splash Screen Test");
// SwingUtilities.updateComponentTreeUI(wkFrame);
if (g != null) {
renderSplashFrame(g, 2, "Loading Core Components");
splash.update();
}
// Load and set an image as icon for the frame
Image image = Toolkit.getDefaultToolkit().createImage(
"images/wkicon.png");
wkFrame.setIconImage(image);
if (g != null) {
renderSplashFrame(g, 3, "Loading Core Components");
splash.update();
}
Dimension screenSize = Toolkit.getDefaultToolkit()
.getScreenSize();
wkFrame.setSize(screenSize);
if (g != null) {
renderSplashFrame(g, 4, "Set Dimension");
splash.update();
}
wkFrame.setLocation(0, 0);
if (g != null) {
renderSplashFrame(g, 5, "Set Component Position");
splash.update();
}
// do some work
if (g != null) {
renderSplashFrame(g, 6, "Loading MenuBar");
splash.update();
}
// do some work
if (g != null) {
renderSplashFrame(g, 7, "Loading ToolBar");
splash.update();
}
// do some work
if (g != null) {
renderSplashFrame(g, 8, "Loading Main part");
splash.update();
}
// do some work
if (g != null) {
renderSplashFrame(g, 9, "Loading Status Bar");
splash.update();
}
// Finish setting up the frame, and show it.
wkFrame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
wkFrame.setExtendedState(wkFrame.getExtendedState()
| JFrame.MAXIMIZED_BOTH);
if (g != null) {
renderSplashFrame(g, 10, "Finish");
splash.update();
}
wkFrame.setVisible(true);
}
});
}
private static void renderSplashFrame(Graphics2D g, int frame,
String content) {
g.setComposite(AlphaComposite.Src);
g.setColor(Color.GREEN);
g.fillRect(258, 349, 20 * frame, 10);
g.setComposite(AlphaComposite.Clear);
g.fillRect(258, 330, 200, 20);
g.setPaintMode();
g.setColor(Color.BLACK);
g.drawString(content, 258, 340);
}
}
We need to set command line parameter -splash as follows
java -splash:images/slpash.jpg SplashScreenDemo
When we make jar bundle that time we need to add Splash Screen entry into manifest.mf file in jar
Manifest-Version: 1.0
Main-Class: SplashScreenDemo
SplashScreen-Image: images/splash.jpg
Tip: This Feature only works latest Java 6 Version
final SplashScreen splash = SplashScreen.getSplashScreen();
if (splash == null) {
System.out.println("Splash not supported");
} else {
g = splash.createGraphics();
renderSplashFrame(g, 1, "Iniitiating");
splash.update();
}
Its retrieve the Splash Screen image mentions in command line parameter. and make the SplashScreen object.
If that object is null then Ur JRE cant support splash screen.
if its supports we construct the Graphics Object then we can process like normal paint method.
and we need to call update method, if anything is modified in graphics.
