java - MenuShortcut KeyEvent not working -

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the code below testable class should print out text when control+a has been pushed on keyboard, , display image in system tray. dependent on system tray being supported operating system.

my issue text not being printed out when push control+a, printed when press item in system tray.

/**  *  * @author tyluur  * @since aug 23, 2013  */ public class testable {  public static void main(string... args) {     registertrayitems(); }  private static void registertrayitems() {     if (systemtray.issupported()) {         systemtray tray = systemtray.getsystemtray();         trayicon icon = null;         menushortcut shortcut = new menushortcut(keyevent.vk_a);         menuitem menuitem = new menuitem("toggle", shortcut);         menuitem.addactionlistener(new actionlistener() {              @override             public void actionperformed(actionevent e) {                 system.err.println("the action has been called!");             }         });         popupmenu popup = new popupmenu();         popup.add(menuitem);         try {             icon = new trayicon(new imageicon(new url("http://i.imgur.com/xqoz2tn.png")).getimage(), "typer", popup);             tray.add(icon);         } catch (malformedurlexception | awtexception e) {             e.printstacktrace();         }     }        }  }

the reason code not working because java not 'globally' listening key event, when menu has focus , shown.

this reason why there no possibility write pure java keylogger. java allows capture window-directed messages.

a workaround implement 1 of these options:

  • use jni/jna/whatever native wrapper access global key hooking
  • use invisible window, being on top , not shown in system tray captures events. not suggest using 1 may either not work charm or annoys user.

the top approach not hard 1 require use native access , therefor application becomes platform-specific.

good luck!


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