Typically there are three buttons on the device a back button home button and an overview button.
Which of these buttons are required by the standard or de facto standard?
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Home, maybe? Lots of Chinese devices (with non-standard UX) here employ a single touch-and-press home key to achieve various functions.– Andy YanCommented Apr 19, 2017 at 0:44
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@AndyYan I would agree with you accept according to this video it is tap for back press for home forbes.com/sites/bensin/2016/08/06/…– WilliamCommented Apr 19, 2017 at 0:50
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Precisely. Meizu's mBack and ZUK's U-Touch are 2 wider-known examples. I don't really know how Google views those implementations, though. I'm a supporter of onscreen nav keys myself.– Andy YanCommented Apr 19, 2017 at 1:33
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1 Answer
There are 4 if you don't include Hardware Reset, three are mandatory: Home, Menu and Back.
See: https://stackoverflow.com/questions/3524758/are-the-4-android-buttons-standard-ex-back-button-menu-button - almost the same question, same answer.
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1That question is dated since they got rid of the menu button a while ago. I think the overview button might be optional.– WilliamCommented Apr 19, 2017 at 1:54