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What is the right way to close apps in Android?

After using my Samsung Galaxy S III for a while, closing apps and dialogs with the "back" button (front-right), I pressed and held the front-middle button, which brought up a list of all windows and apps I had been using.

I suppose that means that they were still running in the background. How to close them properly?

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marked as duplicate by Matthew Read Jun 23 '12 at 16:15

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What you see there is the list of Last Recent Used apps, they are suspended, but all or most program code is still cached in RAM, so it's fast to restart them. Don't worry about running out of RAM, if a new app needs it, this pages will be freed and used.

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The list of most recently used apps has nothing to do with whether the apps are running, suspended, or neither. –  Matthew Read Jun 23 '12 at 16:14
    
Aha. I'm rather worried about running out of battery -- how can I find out if they're still running? –  Anna Jun 23 '12 at 16:15
    
The list of active apps are shown in Settings => Apps => Active –  ott-- Jun 23 '12 at 16:17
    
@Anna Apps in the background are suspended. Services always run, but you (generally) can't exit those anyways! Best bet is to look at your battery usage and uninstall anything that's behaving particularly badly. –  Matthew Read Jun 23 '12 at 16:18

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