Why don't use on-screen virtual buttons?

Jan Pohanka於 2012年12月21日星期五UTC+8下午7時04分43秒寫道:
>
> Hi,
> I'm working on a new tablet device which has only one mechanical button. 
> From the hardware point of view it "enables" the device. I'd like to know 
> if it is possible to share the function of Home and Power button together.
> Something like single press works as Home, long press works as power menu, 
> even longer press works as power off. Long press of home usualy opens a 
> list of recently used applications, but this can be omited in my project. 
> Can Android work in that way or there is a need to have dedicated power and 
> home button? (I know that home button, can be just virtual on touch panel).
>
> I have tried to find the answer in the Android 4.0 Compatibility 
> Definition document, but there is no such information.
>
> best regards
> Jan
>

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