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    <blockquote> <p>Is there something in the Android developer guidelines that disuadea developers from providing the option to "exit" (stop running) an application from within the application itself?</p> </blockquote> <p>Yes. It is generally not needed, just as it is generally not needed to restart a Web server because some user with a browser decided (s)he is done with a Web app.</p> <blockquote> <p>the vast majority of apps don't have their own Exit functions and hence just keep running forever</p> </blockquote> <p>They don't keep running forever. Android will close things up as needed.</p> <blockquote> <p>don't give you a choice about running when you turn on the phone - they just do by default</p> </blockquote> <p>Those developers <a href="http://www.androidguys.com/2009/12/07/code-pollution-boot-time-services/" rel="nofollow noreferrer">aren't paying attention to me</a>.</p> <blockquote> <p>Both of these things lead to memory usage constantly increasing </p> </blockquote> <p>Generally, it doesn't. If you find specific apps that do this, uninstall them.</p> <blockquote> <p>and your device running with this performance burden all of the time</p> </blockquote> <p>Generally, it doesn't. If you find specific apps that do this, uninstall them.</p> <p>Also, this question is a duplicate of <a href="https://stackoverflow.com/questions/2033914/quitting-an-application-is-that-frowned-upon/2034238#2034238">this one</a>.</p>
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    1. COTo lend some support to the OP's claims, I use advanced task killer and often see a screenful of apps listed in that which have long been closed and I can't think of why they'd still be running in the background. Is that list irrelevant, e.g. are the things appearing an implementation or caching detail and not costing anything? (Note: This is with apps that ship with the phone, not things I've installed.)
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    2. COYou assume ATK is accurately reporting what is running. Android keeps a cache of processes from apps that had been run but are now terminated. This cache can then be used when you start up other apps later on, to save the time forking the process and initializing the Dalvik runtime. The exact rules for when it uses a process out of cache, of course, are not well known. Just because ATK claims something is in RAM does not mean it is causing any harm (e.g., using CPU, preventing other processes from having RAM).
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    3. COThe rules are supposed to be well documented here: http://developer.android.com/guide/topics/fundamentals.html#proclife Of course documentation can always be improved. :) Also if you really want to see what is going on, you can use "adb shell dumpsys activity" -- in that output is a list of all processes with the current memory hierarchy (the adj= value) they are in. Processes with higher numbers will be killed before ones with lower numbers. The numbers map to the categories that are in the documentation, though the exact values have changed across platform versions.
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