Immutable Image Example : Image « J2ME « Java
Immutable Image Example
//jad file (please verify the jar size)
/*
MIDlet-Name: ImmutableImageExample
MIDlet-Version: 1.0
MIDlet-Vendor: MyCompany
MIDlet-Jar-URL: ImmutableImageExample.jar
MIDlet-1: ImmutableImageExample, , ImmutableImageExample
MicroEdition-Configuration: CLDC-1.0
MicroEdition-Profile: MIDP-1.0
MIDlet-JAR-SIZE: 100
*/
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.midlet.MIDlet;
public class ImmutableImageExample extends MIDlet {
private Display display;
private MyCanvas canvas = new MyCanvas(this);
public ImmutableImageExample() {
display = Display.getDisplay(this);
}
protected void startApp() {
display.setCurrent(canvas);
}
protected void pauseApp() {
}
protected void destroyApp(boolean unconditional) {
}
public void exitMIDlet() {
destroyApp(true);
notifyDestroyed();
}
public Display getDisplay() {
return display;
}
}
class MyCanvas extends Canvas implements CommandListener {
private Command exit;
private ImmutableImageExample immutableImageExample;
private Image image = null;
public MyCanvas(ImmutableImageExample immutableImageExample) {
this.immutableImageExample = immutableImageExample;
exit = new Command("Exit", Command.EXIT, 1);
addCommand(exit);
setCommandListener(this);
try {
image = Image.createImage("/myImage.png");
} catch (Exception error) {
Alert alert = new Alert("Failure", "Can't open image file.", null, null);
alert.setTimeout(Alert.FOREVER);
immutableImageExample.getDisplay().setCurrent(alert);
}
}
protected void paint(Graphics graphics) {
if (image != null) {
graphics.drawImage(image, 0, 0, Graphics.VCENTER | Graphics.HCENTER);
}
}
public void commandAction(Command command, Displayable display) {
if (command == exit) {
immutableImageExample.exitMIDlet();
}
}
}
