An exit button is probably only necessary that has too many UI layers (usually done with Intents) that require a number of back keys to exit. Makes perfect sense to have one then. There is a problem too of leaving too many apps open and running out of memory to run an app especially if it needs memory for bitmaps. That isn't handled too well yet by the OS.

On 07/30/2013 10:13 AM, John Coryat wrote:
We had an option to display an exit button that we removed in the last
update. With millions of users, only one person complained that it was
missing. I think the majority of users get the idea that the back key
"backs" the user out of the application.

-John Coryat

On Tuesday, July 30, 2013 11:08:00 AM UTC-5, jtoolsdev wrote:
On 07/30/2013 08:16 AM, Chris wrote:
On Saturday, March 2, 2013 2:32:23 PM UTC-6, John Coryat wrote:
it sounds like the bug on your side (no offense and sorry if I
misunderstood the problem)...

The problem isn't our app, it's the state of Android introductory
orientation. If users don't know how to properly end apps, then they
can
run into all kinds of problems. Case in point are task killers. Perhaps
the
reason these are so popular is that their users just don't know what
the
back key is for.

-John Coryat

Where does it state in developer documentation that the back button is
supposed to end a program?  I don't see what it has to do with Android
introductory orientation, especially when  that is not even the way
Google's apps function.  Try to use back in Gmail sometime - You'll get
a
headache cycling through the last twenty emails you read.  The best
Google
could provide for an "introductory orientation" would be to say "If you
download an app, we have no idea what the back button will do half of
the
time.  We haven't even figured out what we think it should do yet.  Push
it
inside of an application and find out!  Don't you like a surprise?"
The browser even has a "stack" icon that you can click to remove a
session on a web site.  I mentioned it to someone who still only has
Gingerbread and their browser doesn't have that feature.   He was
complaining about having to do so many back keying to get rid of a
session.  I have downloaded some apps like the iHeart Radio app that had
an exit button or exit in their menu.  Anything that can put up many
layers of interface should probably should have an exit.



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