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Somewhat imperfect comparison: in Windows, you can simply press Win+L to lock Windows.

Is there a similar keyboard shortcut in Android?

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No, there is no shortcut, the only way to lock Android, is by pressing the hardware power button which is programmed into the core of Android to do just that, i.e. perform a screen lock. Am sure there's a tasker profile somewhere that would just trigger a screen lock at the tap of the icon :) –  t0mm13b Sep 27 '12 at 13:55
    
And I am sure @t0mm13b wanted to trigger me mentioning Tasker. Same as with Plug'n'play: Works only for 50% (plug works). In fact, there's an option Display -> System Lock to turn the display of and activate keylock. And yes, you can use an icon to trigger that. But there's no "key pressed" event for the keyboard, unfortunately. –  Izzy Sep 27 '12 at 14:52
    
@Izzy : do you by any chance know when have they added that Display -> System Lock option? My 2.3.4 doesn't seem to have it. –  C.B. Nov 20 '13 at 16:20
    
@C.B. You misinterpreted my comment. I was refering to a Tasker activity. –  Izzy Nov 20 '13 at 20:13
    
@Izzy : oh, sorry about that, i'm a "droid noob". However, now that i know more context, i think "you can use an icon to trigger that" qualifies as a good-enough answer, since a shortcut on the touchscreen would be equivalent to a keypress IMO. Thanks for the input (and the clarifying link). –  C.B. Nov 20 '13 at 21:47
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Certain external (bluetooth) keyboards have a function button that does this, but if you haven't found it, it probably isn't there.

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