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J2ME - System Properties

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  1. package System;
  2.  
  3. import javax.microedition.lcdui.Alert;
  4. import javax.microedition.lcdui.AlertType;
  5. import javax.microedition.lcdui.Command;
  6. import javax.microedition.lcdui.CommandListener;
  7. import javax.microedition.lcdui.Display;
  8. import javax.microedition.lcdui.Displayable;
  9. import javax.microedition.lcdui.Form;
  10. import javax.microedition.midlet.MIDlet;
  11. import javax.microedition.midlet.MIDletStateChangeException;
  12.  
  13. public class SystemProperties extends MIDlet implements CommandListener
  14. {
  15. 	private Command esci;
  16.  
  17. 	private Display display;
  18.  
  19. 	private Form form;
  20.  
  21. 	protected void startApp() throws MIDletStateChangeException
  22. 	{
  23. 		display = Display.getDisplay(this);
  24.  
  25. 		form = new Form("System Propiertis");
  26. 		form.setCommandListener(this);
  27.  
  28. 		esci = new Command("Esci", Command.EXIT, 0);
  29. 		form.addCommand(esci);
  30.  
  31. 		Runtime rt = Runtime.getRuntime();
  32. 		rt.gc(); // Garbage Collection
  33.  
  34. 		form.append("Free Memory: " + rt.freeMemory() + "\n");
  35. 		form.append("Total Memory: " + rt.totalMemory() + "\n");
  36. 		form.append(showProp("microedition.configuration"));
  37. 		form.append(showProp("microedition.platform"));
  38. 		form.append(showProp("microedition.locale"));
  39. 		form.append(showProp("microedition.encoding"));
  40. 		form.append(showProp("microedition.encodingClass"));
  41. 		form.append(showProp("microedition.http_proxy"));
  42.  
  43. 		display.setCurrent(form);
  44. 	}
  45.  
  46. 	protected void pauseApp()
  47. 	{
  48.  
  49. 	}
  50.  
  51. 	protected void destroyApp(boolean unconditional) throws MIDletStateChangeException
  52. 	{
  53. 		notifyDestroyed();
  54. 	}
  55.  
  56. 	public String showProp(String str)
  57. 	{
  58. 		String value = System.getProperty(str);
  59. 		StringBuffer stringbuffer = new StringBuffer(50);
  60.  
  61. 		stringbuffer.setLength(0);
  62. 		stringbuffer.append(str);
  63. 		stringbuffer.append(" = ");
  64.  
  65. 		if(value == null)
  66. 			stringbuffer.append("<undefined>");
  67. 		else
  68. 		{
  69. 			stringbuffer.append("\"");
  70. 			stringbuffer.append(value);
  71. 			stringbuffer.append("\"");
  72. 		}
  73.  
  74. 		stringbuffer.append("\n");
  75.  
  76. 		return stringbuffer.toString();
  77. 	}
  78.  
  79. 	public void commandAction(Command c, Displayable d)
  80. 	{
  81. 		if(c == esci)
  82. 		{
  83. 			try
  84. 			{
  85. 				destroyApp(true);
  86. 			}
  87. 			catch(MIDletStateChangeException e)
  88. 			{
  89. 				showException(e);
  90. 			}
  91. 		}
  92. 	}
  93.  
  94. 	public void showException(Exception e)
  95. 	{
  96. 		Alert alert = new Alert("Errore !!!");
  97. 		alert.setString(e.getMessage());
  98. 		alert.setType(AlertType.ERROR);
  99. 		alert.setTimeout(Alert.FOREVER);
  100.  
  101. 		display.setCurrent(alert);
  102. 	}
  103. }

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