Check for keystroke

Question

Im making an application that should see if your online or away. So i need to somehow see when the user hit a key on the keyboard last time. The application is running in the background and you can only access it from the trey.

Is this possible and if it is how would i check.

Best regards

score 1 · Accepted Answer · answered Apr 25 '11 at 22:39

I believe that what you're looking for can be done via a global keyboard hook, but that doesn't have direct support in the JVM. From Googling, it would appear that your only options are to write a C++ shim which you can use via JNI, or go via libffi with JRuby.

score 0 · Answer 2 · edited May 23 '17 at 10:24

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From what I've read here it is not possible to add KeyListener to the SystemTray. The only listener that is supported, is the PropertyChangedListener.

Furthermore from that question it seems to be possible on Windows but not on Linux and MacOS.

edited May 23 '17 at 10:24

Community

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answered Apr 25 '11 at 22:36

leifg

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score 0 · Answer 3 · answered Apr 25 '11 at 22:39

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This is possible, but not using Java. You'll have to use JNI to access OS APIs that provide this information (and implent it differently for each OS).

answered Apr 25 '11 at 22:39

Michael Borgwardt

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Thanks for the answer. Is there a good page i can read more about this? – BlackVoid Apr 26 '11 at 09:53

Check for keystroke

3 Answers3