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Editorial Team
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Asked: 2026-06-14T02:44:17+00:00

I have an app in which it is essential that I execute some code

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I have an app in which it is essential that I execute some code when the user presses the centre button on an android device. I already process the user pressing the right hand button (the back button) via onKeyDown(int keyCode, KeyEvent event) / if (keyCode == KeyEvent.KEYCODE_BACK) so I had assumed that pressing the centre button would be processed in a similar manner. But upon further investigation, it appears that onKeyDown is not called. So my question is; how to I intercept a centre-button press?

P.S. Much to my embarrassment, I’m not even sure what the centre button is called!

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1 Answer

  1. Editorial Team

    You can’t intercept that key (if you are talking about the home-button)
    It is an OS function, which takes the user to his launcher on short-press, and to the multitask-menu on long-press.

    If is also a Core-app Quality Guideline.

    UX-N3 Pressing the Home button at any point navigates to the Home
    screen of the device.

    What you could detect is your application being sent to the background using onStop().

    Before Android 3.0, activities could be killed directly from onPause() without hitting onStop(). So if you are targeting pre-honeycomb devices as well, you might need to look at the onPause() event as well.

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