Why is the Android 'Back' button inconsistent?
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Following from the Android Design Guide: http://developer.android.com/design/patterns/navigation.html it clearly outlines the difference and functionality between the 'Up' button and 'Back' button. Simply, 'Up' allows a user to navigate up within the application hierarchy while 'Back' supposedly takes you back to the last view. This could be useful if you want to share a photo from the Gallery application to Facebook -- pressing 'Back' would navigate you back to the Gallery application. However, at the bottom of the webpage of the Android Design Guide, after composing an email from homescreen, selecting 'Back' does not navigate back to the homescreen. Instead it duplicates functionality of the 'Up' button which moves your up the application hierarchy.
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Answer:
I actually believe that Google would have liked to get rid of it in ICS, and just keep the in app back button, but were afraid of looking like an iPhone.
Scott Ma at Quora Visit the source
Other answers
From the Android Design Guide: "For the Back key, you should make navigation more predictably (sic) by inserting into the task's back stack the complete upward navigation path to the app's topmost screen. This way, a user who has forgotten how they entered your app can safely navigate to the app's topmost screen before exiting it." I'm not sure I agree with their reasoning, but that's what the reasoning is.
Josh Johnson
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