Java/J2ME/Environment

Attributes MIDlet

   <source lang="java">

import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.Graphics; import javax.microedition.lcdui.StringItem; import javax.microedition.midlet.MIDlet; public class AttributesMIDlet extends MIDlet implements CommandListener {

 private Display display;
 protected boolean started;
 private Command exitCommand;
 protected void startApp() {
   if (!started) {
     display = Display.getDisplay(this);
     Canvas canvas = new DummyCanvas();
     Form form = new Form("Attributes");
     exitCommand = new Command("Exit", Command.EXIT, 0);
     form.addCommand(exitCommand);
     boolean isColor = display.isColor();
     form.append(new StringItem(isColor ? "Colors: " : "Grays: ", String.valueOf(display
         .numColors())));
     form.append(new StringItem("Width: ", String.valueOf(canvas.getWidth())));
     form.append(new StringItem("Height: ", String.valueOf(canvas.getHeight())));
     form.append(new StringItem("Pointer? ", String.valueOf(canvas.hasPointerEvents())));
     form.append(new StringItem("Motion? ", String.valueOf(canvas.hasPointerMotionEvents())));
     form.append(new StringItem("Repeat? ", String.valueOf(canvas.hasRepeatEvents())));
     form.append(new StringItem("Buffered? ", String.valueOf(canvas.isDoubleBuffered())));
     form.setCommandListener(this);
     display.setCurrent(form);
     started = true;
   }
 }
 protected void pauseApp() {
 }
 protected void destroyApp(boolean unconditional) {
 }
 public void commandAction(Command c, Displayable d) {
   if (c == exitCommand) {
     notifyDestroyed();
   }
 }

} class DummyCanvas extends Canvas {

 protected void paint(Graphics g) {
 }

}

      </source>
   
  
 
  

Check Color

   <source lang="java">

// jad file /* MIDlet-Name: ColorCheck MIDlet-Version: 1.0 MIDlet-Vendor: MyCompany MIDlet-Jar-URL: ColorCheck.jar MIDlet-1: ColorCheck, ColorCheck.png, ColorCheck MicroEdition-Configuration: CLDC-1.0 MicroEdition-Profile: MIDP-1.0 MIDlet-JAR-SIZE: 100

• /

import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.TextBox; import javax.microedition.midlet.MIDlet; public class CheckColor extends MIDlet implements CommandListener {

 private Display display;
 private TextBox textbox = new TextBox("Check Colors", "", 17, 0);
 private Command exit = new Command("Exit", Command.SCREEN, 1);
 public CheckColor() {
   display = Display.getDisplay(this);
   String message = null;
   if (display.isColor()) {
     message = "Color display.";
   } else {
     message = "No color display";
   }
   textbox.setString(message);
   textbox.addCommand(exit);
   textbox.setCommandListener(this);
 }
 public void startApp() {
   display.setCurrent(textbox);
 }
 public void pauseApp() {
 }
 public void destroyApp(boolean unconditional) {
 }
 public void commandAction(Command command, Displayable displayable) {
   if (command == exit) {
     destroyApp(true);
     notifyDestroyed();
   }
 }

}

      </source>
   
  
 
  

Show Properties

   <source lang="java">

/*--------------------------------------------------

• ShowProperties.java
• Example from the book: Core J2ME Technology
• Copyright John W. Muchow http://www.CoreJ2ME.ru
• You may use/modify for any non-commercial purpose
• -------------------------------------------------*/

import javax.microedition.midlet.*; public class ShowProperties extends MIDlet {

 public void startApp() throws MIDletStateChangeException
 {
   System.out.println("Vendor: " + getAppProperty("MIDlet-Vendor"));
   System.out.println("Description: " + getAppProperty("MIDlet-Description"));
   System.out.println("JadFile Version: " + getAppProperty("JadFile-Version"));    
   System.out.println("MIDlet-Data-Size: " + getAppProperty("MIDlet-Data-Size"));    
   
   Runtime rtime = Runtime.getRuntime();
   System.out.println("Total memory: " + rtime.totalMemory());
   System.out.println("Free memory: " + rtime.freeMemory());    
 }
 public void pauseApp()
 {
 }
 public void destroyApp(boolean unconditional)
 {
 }

}

      </source>