The back button is not an exit button, and developers should not be telling users that it is. If it were an exit button, it would be called exit. There is no exit functionality in Android, for better of worse that is the way Android was designed, and that is the constraints you need to work in.
"There is no such thing as "closing the application" or "auto exiting the app" in the android application model." https://groups.google.com/d/msg/android-developers/TBuJVev9V5k/ECXrVT8NF5IJ -- You received this message because you are subscribed to the Google Groups "Android Discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/android-discuss?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
